http://www.rssboard.org/rss-specification 720 https://escholarship.org/uc/lbnl_ps_ps/rss Recent eScholarship items from Physical Sciences Fri, 15 May 2026 11:14:14 +0000 https://escholarship.org/uc/item/1g79m654 The large-scale structure of the Universe and its evolution encapsulate a wealth of cosmological information. A powerful means of unlocking this knowledge lies in measuring the auto-power spectrum and/or the cross-power spectrum of the galaxy density and momentum fields, followed by the estimation of cosmological parameters based on these spectrum measurements. In this study, we generalize the cross-power spectrum model to accommodate scenarios in which the density and momentum fields are derived from distinct galaxy surveys. The growth rate of the large-scale structures of the Universe, commonly represented as fσ 8 , was extracted by jointly fitting the monopole and quadrupole moments of the auto-density power spectrum, the monopole of the auto-momentum power spectrum, and the dipole of the cross-power spectrum. Our estimators, theoretical models, and parameter-fitting framework were tested using mocks, confirming their robustness and accuracy in retrieving the fiducial growth... https://escholarship.org/uc/item/1g79m654 Thu, 14 May 2026 00:00:00 +0000 Qin, F Blake, C Howlett, C Turner, RJ Lodha, K Bautista, J Lai, Y Amsellem, AJ Aguilar, J Ahlen, S Bianchi, D Brooks, D BenZvi, S Carr, A Chaussidon, E Claybaugh, T Cuceu, A de la Macorra, A Douglass, K Doel, P Ferraro, S https://orcid.org/0000-0003-4992-7854 Font-Ribera, A Forero-Romero, JE Gaztañaga, E Gontcho, S Gontcho A Gutierrez, G Guy, J https://orcid.org/0000-0001-9822-6793 Herrera-Alcantar, HK Honscheid, K Huterer, D Ishak, M Joyce, R Kim, AG https://orcid.org/0000-0001-6315-8743 Kirkby, D https://orcid.org/0000-0002-8828-5463 Kisner, T Kremin, A https://orcid.org/0000-0001-6356-7424 Lahav, O Lamman, C Landriau, M Le Guillou, L Levi, ME https://orcid.org/0000-0003-1887-1018 Manera, M Meisner, A Miquel, R Moustakas, J Muñoz-Gutiérrez, A Nadathur, S Palanque-Delabrouille, N Percival, WJ Poppett, C Prada, F Pérez-Ràfols, I Ross, C Rossi, G Sanchez, E Schlegel, D https://orcid.org/0000-0002-5042-5088 Said, K Schubnell, M Seo, H Silber, J https://orcid.org/0000-0002-3461-0320 Sprayberry, D Tarlé, G Weaver, BA Zarrouk, P Zhou, R Zou, H https://escholarship.org/uc/item/66x0511j In 2021 May the Dark Energy Spectroscopic Instrument (DESI) collaboration began a 5 yr spectroscopic redshift survey to produce a detailed map of the evolving three-dimensional structure of the Universe between z = 0 and z ≈ 4. DESI’s principal scientific objectives are to place precise constraints on the equation of state of dark energy, the gravitationally driven growth of large-scale structure, and the sum of the neutrino masses, and to explore the observational signatures of primordial inflation. We present DESI DR1, which consists of all data acquired during the first 13 months of the DESI main survey, as well as a uniform reprocessing of the DESI Survey Validation data, which were previously made public in the DESI Early Data Release. The DR1 main survey includes high-confidence redshifts for 18.7M objects, of which 13.1M are spectroscopically classified as galaxies, 1.6M as quasars, and 4M as stars, making DR1 the largest sample of extragalactic redshifts ever assembled.... https://escholarship.org/uc/item/66x0511j Tue, 5 May 2026 00:00:00 +0000 Collaboration, DESI Karim, M Abdul Adame, AG Aguado, D Aguilar, J Ahlen, S Alam, S Aldering, G Alexander, DM Alfarsy, R Allen, L Prieto, C Allende Alves, O Anand, A https://orcid.org/0000-0003-2923-1585 Andrade, U Armengaud, E Avila, S Aviles, A Awan, H Bailey, S https://orcid.org/0000-0003-4162-6619 Lizancos, A Baleato Ballester, O Bault, A Bautista, J Bean, R Behera, J BenZvi, S Silva, L Beraldo E Bermejo-Climent, JR Beutler, F Bianchi, D Blake, C Blum, R Bolton, AS Bonici, M Brieden, S Brodzeller, A https://orcid.org/0000-0002-8934-0954 Brooks, D Buckley-Geer, E Burtin, E Byström, A Canning, R Rosell, A Carnero Carr, A Carrilho, P Casas, L Castander, FJ Cereskaite, R Cervantes-Cota, JL Chaussidon, E Chaves-Montero, J Chen, S Chen, X Circosta, C Claybaugh, T Cole, S Cooper, AP Cousinou, M-C Cuceu, A https://orcid.org/0000-0002-2169-0595 Davis, TM Dawson, KS de Belsunce, R de la Cruz, R de la Macorra, A de Mattia, A Deiosso, N Della Costa, J Demina, R Demirbozan, U DeRose, J Dey, A Dey, B Ding, J Ding, Z Doel, P Douglass, K Dowicz, M Ebina, H Edelstein, J Eisenstein, DJ Elbers, W Emas, N Escoffier, S Fagrelius, P Fan, X Fanning, K Favole, G Fawcett, VA Fernández-García, E Ferraro, S https://orcid.org/0000-0003-4992-7854 Findlay, N Font-Ribera, A Forero-Romero, JE Forero-Sánchez, D Frenk, CS Gänsicke, BT Galbany, L García-Bellido, J Garcia-Quintero, C Garrison, LH https://escholarship.org/uc/item/113230xt Recent advances in cosmological observations have provided an unprecedented opportunity to investigate the distribution of baryons relative to the underlying matter. In this work, we show that the gas is more extended than the dark matter, and the amount of baryonic feedback at z≲1 disfavors low-feedback models such as that of state-of-the-art hydrodynamical simulation IllustrisTNG compared with high-feedback models such as that of the original Illustris simulation. This has important implications for bridging the gap between theory and observations and understanding galaxy formation and evolution. Furthermore, a better grasp of the baryon-dark matter link is critical to future cosmological analyses, which are currently impeded by our limited knowledge of baryonic feedback. Here, we measure the kinematic Sunyaev-Zel’dovich (kSZ) effect from the Atacama Cosmology Telescope, stacked on the luminous red galaxy sample of the Dark Energy Spectroscopic Instrument (DESI) imaging survey.... https://escholarship.org/uc/item/113230xt Tue, 5 May 2026 00:00:00 +0000 Hadzhiyska, B Ferraro, S Guachalla, B Ried Schaan, E Aguilar, J Ahlen, S Battaglia, N Bond, JR Brooks, D Calabrese, E Choi, SK https://orcid.org/0000-0002-9113-7058 Claybaugh, T Coulton, WR Dawson, K Devlin, M Dey, B Doel, P Duivenvoorden, AJ Dunkley, J Farren, GS https://orcid.org/0000-0001-5704-1127 Font-Ribera, A Forero-Romero, JE Gallardo, PA Gaztañaga, E Gontcho, S Gontcho Gralla, M Le Guillou, L Gutierrez, G Guy, J https://orcid.org/0000-0001-9822-6793 Hill, JC Hložek, R Honscheid, K Juneau, S Kehoe, R Kisner, T Kremin, A https://orcid.org/0000-0001-6356-7424 Landriau, M Liu, RH Louis, T MacCrann, N de Macorra, A Madhavacheril, M Manera, M Meisner, A Miquel, R Moodley, K Moustakas, J Mroczkowski, T Naess, S Newman, J Niemack, MD Niz, G Page, L Palanque-Delabrouille, N Partridge, B Percival, WJ Prada, F Qu, FJ Rossi, G Sanchez, E Schlegel, D Schubnell, M Sherwin, B Sehgal, N Seo, H Sifón, C Spergel, D Sprayberry, D Staggs, S Tarlé, G Vargas, C Vavagiakis, EM Weaver, BA Wollack, EJ Zhou, R Zou, H https://escholarship.org/uc/item/7849z8p9 The second data release (DR2) of the Dark Energy Spectroscopic Instrument (DESI), containing data from the first three years of observations, doubles the number of Lyman-α (Lyα) forest spectra in DR1 and it provides the largest dataset of its kind. To ensure a robust validation of the baryonic acoustic oscillation (BAO) analysis using Lyα forests, we have made significant updates compared to DR1 to both the mocks and the analysis framework used in the validation. In particular, we present CoLoRe-QL, a new set of Lyα mocks that use a quasilinear input power spectrum to incorporate the nonlinear broadening of the BAO peak. We have also increased the number of realizations used in the validation to 400, compared to the 150 realizations used in DR1. Finally, we present a detailed study of the impact of quasar redshift errors on the BAO measurement, and we compare different strategies to mask damped Lyman-α absorbers in our spectra. The BAO measurement from the Lyα dataset of DESI... https://escholarship.org/uc/item/7849z8p9 Thu, 16 Apr 2026 00:00:00 +0000 Casas, L Herrera-Alcantar, HK Chaves-Montero, J Cuceu, A https://orcid.org/0000-0002-2169-0595 Font-Ribera, A Lokken, M Abdul-Karim, M Ramírez-Pérez, C Alonso, D Aguilar, J Ahlen, S Andrade, U Armengaud, E Aviles, A Bailey, S https://orcid.org/0000-0003-4162-6619 BenZvi, S Bianchi, D Brodzeller, A https://orcid.org/0000-0002-8934-0954 Brooks, D Canning, R Rosell, A Carnero Charles, M Chaussidon, E Claybaugh, T Dawson, KS de la Macorra, A de Mattia, A Dey, Arjun Dey, Biprateep Ding, Z Doel, P Eisenstein, DJ Elbers, W Ferraro, S Forero-Romero, JE Garcia-Quintero, C Garrison, Lehman H Gaztañaga, E Gil-Marín, H Gontcho, S Gontcho A Gonzalez-Morales, AX Gordon, C Gutierrez, G Guy, J https://orcid.org/0000-0001-9822-6793 Herbold, M Honscheid, K Howlett, C Huterer, D Ishak, M Juneau, S Kehoe, R Kirkby, D https://orcid.org/0000-0002-8828-5463 Kisner, T Kremin, A https://orcid.org/0000-0001-6356-7424 Lahav, O Landriau, M Le Goff, JM Le Guillou, L Leauthaud, A Levi, ME Li, Q Manera, M Martini, P Meisner, A Mena-Fernández, J Miquel, R Moustakas, J Santos, D Muñoz Myers, AD Nadathur, S Napolitano, L Niz, G Noriega, HE Paillas, E Palanque-Delabrouille, N Percival, WJ Pieri, Matthew M Poppett, C Prada, F Pérez-Ràfols, I Ravoux, C Rossi, G Sanchez, E Schlegel, D Schubnell, M Seo, H Sinigaglia, F Sprayberry, D Tan, T Tarlé, G Taylor, P Turner, W Vargas-Magaña, M Walther, M Weaver, BA Wolfson, M Yèche, C Zarrouk, P Zhou, R https://escholarship.org/uc/item/08w8g9wb We present a search for polarization oscillation of the Crab Nebula, also known as Tau A, at millimeter wavelengths using observations with the Simons Array, the successor experiment to POLARBEAR. We follow up on previous work by POLARBEAR using 90 GHz band data of the 2023 observing season of the Simons Array to evaluate the variability of Tau A’s polarization angle. Tau A is widely used as a polarization angle calibration source in millimeter-wave astronomy, and thus it is necessary to validate the stability. Additionally, an interesting application of the time-resolved polarimetry of Tau A is to search for axionlike particles (ALPs). We do not detect a global signal across the frequencies considered in this analysis and place a median 95% upper bound of polarization oscillation amplitude A<0.12° over oscillation frequencies from 3.39 yr-1 to 1.50 day-1. This constrains the ALP-photon coupling at a median 95% upper bound of gaγγ<3.84×10-12×(ma/10-21 eV) in the mass range... https://escholarship.org/uc/item/08w8g9wb Tue, 14 Apr 2026 00:00:00 +0000 Adkins, Tylor Arnold, Kam Baccigalupi, Carlo Barron, Darcy R Bixler, Bryce https://orcid.org/0009-0008-4312-6814 Chinone, Yuji Chu, Matthew R Crowley, Kevin T Farias, Nicole Fujino, Takuro Hasegawa, Masaya Hazumi, Masashi Hirose, Haruaki Ito, Jennifer Jeong, Oliver Kaneko, Daisuke Keating, Brian Kusaka, Akito Lee, Adrian T Murata, Masaaki Piccirillo, Lucio Reichardt, Christian L Sakaguri, Kana Arani, Shahed Shayan Siritanasak, Praween Takakura, Satoru Takatori, Sayuri Tajima, Osamu Yamada, Kyohei Zhou, Yuyang https://escholarship.org/uc/item/0sj1h6rn Erratum: DESI 2024 V: Full-Shape Galaxy Clustering from Galaxies and Quasars https://escholarship.org/uc/item/0sj1h6rn Tue, 10 Mar 2026 00:00:00 +0000 Adame, AG Aguilar, J Ahlen, S Alam, S Alexander, DM Alvarez, M Alves, O Anand, A https://orcid.org/0000-0003-2923-1585 Andrade, U Armengaud, E Avila, S Aviles, A Awan, H Bailey, S https://orcid.org/0000-0003-4162-6619 Baltay, C Bault, A Behera, J BenZvi, S Beutler, F Bianchi, D Blake, C Blum, R Brieden, S Brodzeller, A https://orcid.org/0000-0002-8934-0954 Brooks, D Buckley-Geer, E Burtin, E Calderon, R Canning, R Rosell, A Carnero Cereskaite, R Cervantes-Cota, JL Chabanier, S Chaussidon, E Chaves-Montero, J Chen, S Chen, X Claybaugh, T Cole, S Cuceu, A https://orcid.org/0000-0002-2169-0595 Davis, TM Dawson, K de la Macorra, A de Mattia, A Deiosso, N Dey, A Dey, B Ding, Z Doel, P Edelstein, J Eftekharzadeh, S Eisenstein, DJ Elliott, A Fagrelius, P Fanning, K Ferraro, S https://orcid.org/0000-0003-4992-7854 Ereza, J Findlay, N Flaugher, B Font-Ribera, A Forero-Sánchez, D Forero-Romero, JE Garcia-Quintero, C Garrison, LH Gaztañaga, E Gil-Marín, H Gontcho, S Gontcho A Gonzalez-Morales, AX Gonzalez-Perez, V Gordon, C Green, D Gruen, D Gsponer, R Gutierrez, G Guy, J https://orcid.org/0000-0001-9822-6793 Hadzhiyska, B Hahn, C Hanif, MMS Herrera-Alcantar, HK Honscheid, K Howlett, C Huterer, D Iršič, V Ishak, M Juneau, S Karaçaylı, NG Kehoe, R Kent, S Kirkby, D https://orcid.org/0000-0002-8828-5463 Kong, H Koposov, SE Kremin, A https://orcid.org/0000-0001-6356-7424 Krolewski, A Lai, Y Lan, T-W Landriau, M https://orcid.org/0000-0003-1838-8528 Lang, D Lasker, J Le Goff, JM Le Guillou, L https://escholarship.org/uc/item/30b6q2d1 The Lyman-α forests observed in the spectra of high-redshift quasars can be used as a tracer of the cosmological matter density to study baryon acoustic oscillations (BAO) and the Alcock-Paczynski effect. Extraction of cosmological information from these studies requires modeling of the forest correlations. While the models depend most importantly on the bias parameters of the intergalactic medium (IGM), they also depend on the numbers and characteristics of high-column-density systems (HCDs) ranging from Lyman-limit systems with column densities log N HI/1cm-2 > 17 to damped Lyman-α systems (DLAs) with log N HI/1cm-2 > 20.2. These HCDs introduce broad damped absorption characteristic of a Voigt profile. Consequently they imprint a component on the power spectrum whose modes in the radial direction are suppressed, leading to a scale-dependent bias. Using mock data sets of known HCD content, we test a model that describes this effect in terms of the distribution of column... https://escholarship.org/uc/item/30b6q2d1 Thu, 5 Mar 2026 00:00:00 +0000 Tan, T Rich, J Chaussidon, E Le Goff, JM Balland, C Armengaud, E Aguilar, J Ahlen, S Bianchi, D Brooks, D Claybaugh, T Cuceu, A https://orcid.org/0000-0002-2169-0595 de la Macorra, A Doel, P Forero-Romero, JE Gaztañaga, E Gontcho, S Gontcho A Gutierrez, G Herrera-Alcantar, HK Honscheid, K Ishak, M Kirkby, D https://orcid.org/0000-0002-8828-5463 Kisner, T Kremin, A https://orcid.org/0000-0003-0667-5941 Landriau, M https://orcid.org/0000-0003-1838-8528 Le Guillou, L Manera, M Martini, P Miquel, R Nadathur, S Palanque-Delabrouille, N Prada, F Pérez-Ràfols, I Rossi, G Sanchez, E Schlegel, D Schubnell, M Seo, H Silber, J https://orcid.org/0000-0002-3461-0320 Sprayberry, D Tarlé, G Walther, M Weaver, BA Zou, H https://escholarship.org/uc/item/9hs8m826 Emission Line Galaxies (ELGs) are one of the main tracers that the Dark Energy Spectroscopic Instrument (DESI) uses to probe the universe. However, they are afflicted by strong spurious correlations between target density and observing conditions known as imaging systematics. In this paper, we present the imaging systematics mitigation applied to the DESI Data Release 1 (DR1) large-scale structure catalogs used in the DESI 2024 cosmological analyses. We also explore extensions of the fiducial treatment. This includes a combined approach, through forward image simulations (Obiwan) in conjunction with neural network-based regression, to obtain an angular selection function that mitigates the imaging systematics observed in the DESI DR1 ELGs target density. We further derive a line of sight selection function from the forward model that removes the strong redshift dependence between imaging systematics and low redshift ELGs. Combining both angular and redshift-dependent systematics,... https://escholarship.org/uc/item/9hs8m826 Wed, 4 Mar 2026 00:00:00 +0000 Rosado-Marín, AJ Ross, AJ Seo, H Rezaie, M Kong, H de Mattia, A Zhou, R https://orcid.org/0000-0001-5381-4372 Aguilar, J Ahlen, S Alves, O Bianchi, D Brooks, D Burtin, E Chaussidon, E Chen, X Claybaugh, T Dawson, KS de la Macorra, A Dey, A Doel, P Fanning, K Ferraro, S https://orcid.org/0000-0003-4992-7854 Forero-Romero, JE Gaztañaga, E Gontcho, S Gontcho A Gutierrez, G Hahn, C Hanif, MMS Howlett, C Juneau, S Kehoe, R Kisner, T Kremin, A https://orcid.org/0000-0001-6356-7424 Krolewski, A Landriau, M https://orcid.org/0000-0003-1838-8528 Le Guillou, L Levi, ME https://orcid.org/0000-0003-1887-1018 Meisner, A Mena-Fernández, J Miquel, R Moustakas, J Newman, JA Paillas, E Palanque-Delabrouille, N Percival, WJ Prada, F Pérez-Ràfols, I Raichoor, A https://orcid.org/0000-0001-5999-7923 Rossi, G Ruggeri, R Sanchez, E Schlafly, EF https://orcid.org/0000-0002-3569-7421 Schlegel, D Schubnell, M Sprayberry, D Vargas-Magaña, M Weaver, BA Yu, J Zou, H https://escholarship.org/uc/item/8xn4v0s5 Understanding whether cosmic acceleration arises from a cosmological constant or a dynamical component is a central goal of cosmology, and the Dark Energy Spectroscopic Instrument (DESI) enables stringent tests with high-precision distance measurements. Here we analyse measurements of baryon acoustic oscillations in DESI Data Release 1 and Data Release 2 and consider type Ia supernovae and a distance prior for the cosmic microwave background. With the larger statistical power and wider redshift coverage of Data Release 2, the preference for dynamical dark energy does not diminish relative to Data Release 1. Using both a shape-function reconstruction and non-parametric approaches with a Horndeski-motivated correlation prior, we find that the equation of state for dark energy w(z) varies with redshift. Baryon acoustic oscillation data alone yield modest constraints, but in combination with independent supernova compilations and the prior for the cosmic microwave background, they... https://escholarship.org/uc/item/8xn4v0s5 Wed, 4 Mar 2026 00:00:00 +0000 Gu, Gan Wang, Xiaoma Wang, Yuting Zhao, Gong-Bo Pogosian, Levon Koyama, Kazuya Peacock, John A Cai, Zheng Cervantes-Cota, Jorge L Ishak, Mustapha Shafieloo, Arman Zhao, Ruiyang Ahlen, Steven Bianchi, Davide Brooks, David Claybaugh, Todd Cole, Shaun de la Macorra, Axel de Mattia, Arnaud Doel, Peter Ferraro, Simone https://orcid.org/0000-0003-4992-7854 Forero-Romero, Jaime E Gaztañaga, Enrique Gontcho A Gontcho, Satya Gutierrez, Gaston Hahn, ChangHoon Howlett, Cullan Kehoe, Robert Kirkby, David https://orcid.org/0000-0002-8828-5463 Kneib, Jean-Paul Kremin, Anthony https://orcid.org/0000-0003-0667-5941 Lahav, Ofer Landriau, Martin https://orcid.org/0000-0003-1838-8528 Le Guillou, Laurent Leauthaud, Alexie Levi, Michael https://orcid.org/0000-0003-1887-1018 Manera, Marc Meisner, Aaron Miquel, Ramon Moustakas, John Muñoz-Gutiérrez, Andrea Nadathur, Seshadri Newman, Jeffrey A Palanque-Delabrouille, Nathalie Percival, Will Prada, Francisco Pérez-Ràfol, Ignasi Rossi, Graziano Samushia, Lado Sanchez, Eusebio Schlegel, David https://orcid.org/0000-0002-5042-5088 Seo, Hee-Jong Sprayberry, David Tarlé, Gregory Walther, Michael Weaver, Benjamin Alan Zarrouk, Pauline Zhao, Cheng Zhou, Rongpu https://orcid.org/0000-0001-5381-4372 Zou, Hu https://escholarship.org/uc/item/4cw6j0rf The gas density profile around galaxies, shaped by feedback and affecting the galaxy lensing signal, is imprinted on the cosmic microwave background (CMB) by the kinematic Sunyaev-Zel’dovich effect (kSZ). We precisely measure this effect (S/N≈10) via velocity stacking with 825,283 spectroscopically confirmed luminous red galaxies (LRG) from the Dark Energy Spectroscopic Instrument Year 1 (DESI Y1) survey, which overlap with the Atacama Cosmology Telescope (ACT) Data Release 6 temperature maps over ≥4,000 deg2. We explore the kSZ dependence with various galaxy parameters and find no significant trend with redshift but clear trends with stellar mass and absolute magnitude in g, r, and z bands. Our analysis suggests that the gas extends beyond the dark matter halo (99.5% confidence level, i.e., probability to exceed (PTE)=0.005). We find a tentative preference for hydrodynamical simulation models with stronger feedback that drives gas further out (Illustris z=0.5, PTE=0.37) over... https://escholarship.org/uc/item/4cw6j0rf Wed, 4 Mar 2026 00:00:00 +0000 Guachalla, Bernardita Ried Schaan, Emmanuel Hadzhiyska, Boryana Ferraro, Simone https://orcid.org/0000-0003-4992-7854 Aguilar, Jessica N Ahlen, Steven Battaglia, Nicholas Bianchi, Davide Bond, Richard Brooks, David Claybaugh, Todd Coulton, William R de la Macorra, Axel Devlin, Mark J Dey, Arjun Doel, Peter Dunkley, Jo Fanning, Kevin Forero-Romero, Jaime Gaztañaga, Enrique Gontcho, Satya Gontcho A Gutierrez, Gaston Guy, Julien https://orcid.org/0000-0001-9822-6793 Hill, J Colin Honscheid, Klaus Juneau, Stephanie Kisner, Theodore Kremin, Anthony https://orcid.org/0000-0003-0667-5941 Lambert, Andrew Landriau, Martin https://orcid.org/0000-0003-1838-8528 Le Guillou, Laurent MacCrann, Niall Manera, Marc Meisner, Aaron Miquel, Ramon Moodley, Kavilan Moustakas, John Mroczkowski, Tony Myers, Adam D Niemack, Michael D Niz, Gustavo Palanque-Delabrouille, Nathalie Percival, Will Pérez-Ràfols, Ignasi Poppett, Claire Prada, Francisco Qu, Frank J Rossi, Graziano Sanchez, Eusebio Schlegel, David Schubnell, Michael Seo, Hee-Jong Sifón, Cristóbal Spergel, David N Sprayberry, David Tarlé, Gregory Vargas-Magaña, Mariana Vavagiakis, Eve M Weaver, Benjamin A Wollack, Edward J Zarrouk, Pauline https://escholarship.org/uc/item/4849h0w9 We present the one-dimensional Lyman-α forest power spectrum measurement derived from the data release 1 (DR1) of the Dark Energy Spectroscopic Instrument (DESI). The measurement of the Lyman-α forest power spectrum along the line of sight from high-redshift quasar spectra provides information on the shape of the linear matter power spectrum, neutrino masses, and the properties of dark matter. In this work, we use a Fast Fourier Transform (FFT)-based estimator, which is validated on synthetic data in a companion paper. Compared to the FFT measurement performed on the DESI early data release, we improve the noise characterization with a cross-exposure estimator and test the robustness of our measurement using various data splits. We also refine the estimation of the uncertainties and now present an estimator for the covariance matrix of the measurement. Furthermore, we compare our results to previous high-resolution and eBOSS measurements. In another companion paper, we present... https://escholarship.org/uc/item/4849h0w9 Wed, 4 Mar 2026 00:00:00 +0000 Ravoux, Corentin Abdul-Karim, Marie-Lynn Le Goff, Jean-Marc Armengaud, Eric Aguilar, Jessica N Ahlen, Steven Bailey, Stephen https://orcid.org/0000-0003-4162-6619 Bianchi, Davide Brodzeller, Allyson https://orcid.org/0000-0002-8934-0954 Brooks, David Chaves-Montero, Jonás Claybaugh, Todd Cuceu, Andrei https://orcid.org/0000-0002-2169-0595 de Belsunce, Roger de la Macorra, Axel Dey, Arjun Ding, Zhejie Doel, Peter Ferraro, Simone https://orcid.org/0000-0003-4992-7854 Font-Ribera, Andreu Forero-Romero, Jaime E Gaztañaga, Enrique Karaçaylı, Naim Göksel Gontcho, Satya Gontcho A Gutierrez, Gaston Guy, Julien https://orcid.org/0000-0001-9822-6793 Herrera-Alcantar, Hiram K Ishak, Mustapha Kehoe, Robert Kirkby, David https://orcid.org/0000-0002-8828-5463 Kisner, Theodore Kremin, Anthony https://orcid.org/0000-0003-0667-5941 Landriau, Martin https://orcid.org/0000-0003-1838-8528 Le Guillou, Laurent Levi, Michael E https://orcid.org/0000-0003-1887-1018 Manera, Marc Martini, Paul Meisner, Aaron Miquel, Ramon Montero-Camacho, Paulo Muñoz-Gutiérrez, Andrea Nadathur, Seshadri Niz, Gustavo Palanque-Delabrouille, Nathalie Pan, Zhiwei Percival, Will J Pérez-Ràfols, Ignasi Pieri, Matthew M Prada, Francisco Rossi, Graziano Sanchez, Eusebio Saulder, Christoph Schlegel, David Schubnell, Michael Seo, Hee-Jong Silber, Joseph H https://orcid.org/0000-0002-3461-0320 Siudek, Małgorzata Sprayberry, David Tan, Ting Tang, Ji-Jia Tarlé, Gregory Walther, Michael Weaver, Benjamin A Yèche, Christophe Yu, Jiaxi Zhou, Rongpu https://orcid.org/0000-0001-5381-4372 Zou, Hu https://escholarship.org/uc/item/2v5013dn Correlations of fluctuations of the flux in Lyman-α forests of high-redshift quasars have been observed by the Baryonic Acoustic Oscillation Spectroscopy Survey (BOSS) and the Dark Energy Spectroscopy Instrument (DESI) survey where they have revealed the effects of baryon acoustic oscillations (BAO). In order to fit the correlation functions to a physical model and thereby constrain cosmological parameters, it is necessary to take into account the effects of fitting the observed spectra to a template about which the fluctuations are measured. In this paper we use mock spectra to test the distortion matrix technique that has been used since the final BOSS data release to appropriately distort the models. We show that while percent-level effects on the derived forest bias parameters may be present, the technique works sufficiently well that the determination of the BAO peak position is not affected at the percent level. We introduce modifications in the technique used by DESI that... https://escholarship.org/uc/item/2v5013dn Wed, 4 Mar 2026 00:00:00 +0000 Busca, Nicolas Rich, James Bautista, Julian Cuceu, Andrei Font-Ribera, Andreu Guy, Julien https://orcid.org/0000-0001-9822-6793 Herrera-Alcantar, Hiram K Stermer, Julianna Balland, Christophe Aguilar, J Ahlen, S Bianchi, D Brooks, D Claybaugh, T de la Macorra, A Doel, P Ferraro, S Forero-Romero, JE Gaztañaga, E Gordon, C Gutierrez, G Ishak, M Kehoe, R Kirkby, D https://orcid.org/0000-0002-8828-5463 Kremin, A https://orcid.org/0000-0003-0667-5941 Landriau, M Le Guillou, L Magneville, C Martini, P Miquel, R Nadathur, S Palanque-Delabrouille, N Prada, F Pérez-Ràfols, I Ravoux, C Rossi, G Sanchez, E Schlegel, D Seo, H Silber, J https://orcid.org/0000-0002-3461-0320 Sprayberry, D Tarlé, G Weaver, BA Zhou, R Zou, H https://escholarship.org/uc/item/1ch809d5 We present cosmological constraints on deviations from general relativity (GR) from the first-year of clustering observations from the Dark Energy Spectroscopic Instrument (DESI) in combination with other available datasets including the CMB data from Planck with CMB-lensing from Planck and ACT, BBN constraints on the physical baryon density, the galaxy weak lensing and clustering from DESY3 and supernova data from DESY5. We first consider the μ(a,k)–Σ(a,k) modified gravity (MG) parameterization (as well as η(a,k)) in a ΛCDM and a w 0 wa CDM cosmological backgrounds. Using a functional form for time-only evolution gives μ 0 = 0.11+0.44 -0.54 from DESI(FS+BAO)+BBN and a wide prior on ns . Using DESI(FS+BAO)+CMB+DESY3+DESY5-SN, we obtain μ 0 = 0.05 ± 0.22 and Σ0 = 0.008 ± 0.045 and similarly μ 0 = 0.02+0.19 -0.24 and η 0 = 0.09+0.36 -0.60, in an ΛCDM background. In w 0 wa CDM we obtain μ 0 = -0.24+0.32 -0.28 and Σ0 = 0.006 ± 0.043, consistent with GR, and we still find a preference... https://escholarship.org/uc/item/1ch809d5 Wed, 4 Mar 2026 00:00:00 +0000 Ishak, M Pan, J Calderon, R Lodha, K Valogiannis, G Aviles, A Niz, G Yi, L Zheng, C Garcia-Quintero, C de Mattia, A Medina-Varela, L Cervantes-Cota, JL Andrade, U Huterer, D Noriega, HE Zhao, G Shafieloo, A Fang, W Ahlen, S Bianchi, D Brooks, D Burtin, E Chaussidon, E Claybaugh, T Cole, S de la Macorra, A Dey, A Fanning, K Ferraro, S https://orcid.org/0000-0003-4992-7854 Font-Ribera, A Forero-Romero, JE Gaztañaga, E Gil-Marín, H Gontcho, S Gontcho A Gutierrez, G Hahn, C Honscheid, K Howlett, C Juneau, S Kirkby, D https://orcid.org/0000-0002-8828-5463 Kisner, T Kremin, A https://orcid.org/0000-0003-0667-5941 Landriau, M https://orcid.org/0000-0003-1838-8528 Le Guillou, L Leauthaud, A Levi, ME https://orcid.org/0000-0003-1887-1018 Meisner, A Miquel, R Moustakas, J Newman, JA Palanque-Delabrouille, N Percival, WJ Poppett, C Prada, F Pérez-Ràfols, I Ross, AJ Rossi, G Sanchez, E Schlegel, D Schubnell, M Seo, H Sprayberry, D Tarlé, G Vargas-Magaña, M Weaver, BA Wechsler, RH Yèche, C Zarrouk, P Zhou, R https://orcid.org/0000-0001-5381-4372 Zou, H https://escholarship.org/uc/item/0z2063j6 The spectroscopic data from DESI Data Release 1 (DR1) galaxies enables the analysis of 3D clustering by fitting galaxy power spectra and reconstructed correlation functions in redshift space. Given low measurements of the amplitude of structure from cosmic shear at z ∼ 1, redshift space distortions (RSD) + Baryon Acoustic Oscillation (BAO) signals from DESI galaxies combined with weak lensing can break degeneracies and provide a tight alternative constraint on the z ∼ 1 amplitude of structure. In this paper we perform joint analyses that combine full-shape + post-reconstruction information from the DESI DR1 BGS and LRG samples along with angular cross-correlations with Planck PR4 and ACT DR6 CMB lensing maps. We show that adding galaxy-lensing cross-correlations tightens clustering amplitude constraints, improving σ 8 uncertainties by 30% over RSD+BAO alone. We also include angular galaxy-galaxy and galaxy-lensing spectra using photometric samples from the DESI Legacy Survey to... https://escholarship.org/uc/item/0z2063j6 Wed, 4 Mar 2026 00:00:00 +0000 Maus, M White, M https://orcid.org/0000-0001-9912-5070 Sailer, N Lizancos, A Baleato Ferraro, S https://orcid.org/0000-0003-4992-7854 Chen, S DeRose, J Aguilar, J Ahlen, S BenZvi, S Bianchi, D Brooks, D Burtin, E Castander, FJ Chaussidon, E Claybaugh, T Cuceu, A https://orcid.org/0000-0002-2169-0595 de la Macorra, A de Mattia, A Doel, P Font-Ribera, A Forero-Romero, JE Gaztañaga, E Gontcho, S Gontcho A Gutierrez, G Guy, J https://orcid.org/0000-0001-9822-6793 Honscheid, K Howlett, C Ishak, M Kehoe, R Kirkby, D https://orcid.org/0000-0002-8828-5463 Kisner, T Kremin, A https://orcid.org/0000-0003-0667-5941 Lahav, O Lamman, C Landriau, M https://orcid.org/0000-0003-1838-8528 Le Guillou, L Levi, ME https://orcid.org/0000-0003-1887-1018 Manera, M Meisner, A Miquel, R Nadathur, S Newman, JA Palanque-Delabrouille, N Percival, WJ Prada, F Pérez-Ràfols, I Ross, AJ Rossi, G Samushia, L Sanchez, E Schlegel, D Schubnell, M Seo, H Silber, J https://orcid.org/0000-0002-3461-0320 Sprayberry, D Tarlé, G Weaver, BA Zarrouk, P Zhou, R https://orcid.org/0000-0001-5381-4372 Zou, H https://escholarship.org/uc/item/092750c5 The peak of the matter power spectrum, known as the turnover (TO) scale, is determined by the horizon size at the time of matter-radiation equality. This scale can serve as a standard ruler, independent of other features in the matter power spectrum, such as baryon acoustic oscillations (BAO). Here, we present the first detection of the turnover in the galaxy autopower spectrum, utilizing the distribution of quasars and luminous red galaxies (LRG) measured by the Dark Energy Spectroscopic Instrument (DESI) during its first year of survey operations in a model-independent manner. To avoid confirmation bias, we first analyze the data using data blinding methods designed for the DESI baryon acoustic oscillation, redshift space distortion and scale-dependent bias signals. We measure the angle-averaged dilation distance DV(z=1.651)=(38.1±2.5)rH from the quasars and DV(z=0.733)=(21.8±1.0)rH from the LRG sample in units of the horizon rH at the matter-radiation-equality epoch. Combining... https://escholarship.org/uc/item/092750c5 Wed, 4 Mar 2026 00:00:00 +0000 Bahr-Kalus, B Parkinson, D Lodha, K Mueller, E Chaussidon, E de Mattia, A Forero-Sánchez, D Aguilar, J Ahlen, S Bianchi, D Brooks, D Claybaugh, T Cuceu, A de la Macorra, A Doel, P Font-Ribera, A Gaztañaga, E Gontcho, S Gontcho A Gutierrez, G Honscheid, K Huterer, D Ishak, M Kehoe, R Kent, S Kirkby, D https://orcid.org/0000-0002-8828-5463 Kisner, T Kremin, A https://orcid.org/0000-0003-0667-5941 Lahav, O Landriau, M Le Guillou, L Magneville, C Manera, M Martini, P Meisner, A Miquel, R Moustakas, J Nadathur, S Palanque-Delabrouille, N Percival, WJ Prada, F Pérez-Ràfols, I Ross, AJ Rossi, G Samushia, L Sanchez, E Schlegel, D Schubnell, M Seo, H Silber, J https://orcid.org/0000-0002-3461-0320 Sprayberry, D Tarlé, G Weaver, BA Zhou, R Zou, H https://escholarship.org/uc/item/03q290h9 Over several dedicated programs that include targets beyond the main cosmological samples, the Dark Energy Spectroscopic Instrument collected spectra for 304,970 unique objects in two fields centered on the COSMOS and XMM-LSS fields. In this work, we develop spectroscopic redshift robustness criteria for those spectra, validate these criteria using visual inspection, and provide two custom value-added catalogs with our redshift characterizations. With these criteria, we reliably classify 212,935 galaxies below z < 1.6, 9713 quasars, and 35,222 stars. The resulting catalogs achieve a redshift purity exceeding 99.4% across all galaxy samples. As a critical element in characterizing the selection function, we provide the description of 70 different algorithms that were used to select these targets from imaging data. To facilitate joint imaging/spectroscopic analyses, we provide row-matched photometry from the Dark Energy Camera, Hyper-Suprime Cam, and public COSMOS2020 photometric... https://escholarship.org/uc/item/03q290h9 Wed, 4 Mar 2026 00:00:00 +0000 Ratajczak, J Dawson, KS Weaverdyck, N https://orcid.org/0000-0001-9382-5199 Aguilar, J Ahlen, S Armengaud, E Bailey, S https://orcid.org/0000-0003-4162-6619 Bianchi, D Blanco, D Brodzeller, A https://orcid.org/0000-0002-8934-0954 Brooks, D Castander, FJ Claybaugh, T Cuceu, A https://orcid.org/0000-0002-2169-0595 de la Macorra, A Dey, Arjun Dey, Biprateep Doel, P Font-Ribera, A Forero-Romero, JE Gaztañaga, E Gontcho, S Gontcho A Gutierrez, G Guy, J https://orcid.org/0000-0001-9822-6793 Hagen, T Herrera-Alcantar, HK Honscheid, K Huterer, D Ishak, M Jimenez, J Joyce, R Juneau, S Kehoe, R Kirkby, D https://orcid.org/0000-0002-8828-5463 Kisner, T Koposov, SE Kremin, A https://orcid.org/0000-0003-0667-5941 Lahav, O Lambert, A Lamman, C Landriau, M https://orcid.org/0000-0003-1838-8528 Le Guillou, L Leauthaud, A Lee, J Levi, ME https://orcid.org/0000-0003-1887-1018 Li, Q Longhurst, I Luo, Y https://orcid.org/0000-0001-7729-6629 Manera, M Martini, P McCullough, J Meisner, A Miquel, R Moustakas, J Nadathur, S Newman, JA Palanque-Delabrouille, N Percival, WJ Poppett, C Prada, F Pérez-Ràfols, I Raichoor, A https://orcid.org/0000-0001-5999-7923 Ravoux, C Rossi, G Hernandez, Y Salcedo Sanchez, E Saulder, C Schlegel, D https://orcid.org/0000-0002-5042-5088 Schubnell, M Seo, H Sprayberry, D Tarlé, G Weaver, BA Wechsler, RH White, M https://orcid.org/0000-0001-9912-5070 Zhou, R https://orcid.org/0000-0001-5381-4372 Zou, H https://escholarship.org/uc/item/8gg3z5b3 We present the measurements and cosmological implications of the galaxy two-point clustering using over 4.7 million unique galaxy and quasar redshifts in the range 0.1 < z < 2.1 divided into six redshift bins over a ∼ 7,500 square degree footprint, from the first year of observations with the Dark Energy Spectroscopic Instrument (DESI Data Release 1). By fitting the full power spectrum, we extend previous DESI DR1 baryon acoustic oscillation (BAO) measurements to include redshift-space distortions and signals from the matter-radiation equality scale. For the first time, this Full-Shape analysis is blinded at the catalogue-level to avoid confirmation bias and the systematic errors are accounted for at the two-point clustering level, which automatically propagates them into any cosmological parameter. When analysing the data in terms of compressed model-agnostic variables, we obtain a combined precision of 4.7% on the amplitude of the redshift space distortion (RSD) signal... https://escholarship.org/uc/item/8gg3z5b3 Tue, 3 Mar 2026 00:00:00 +0000 Adame, AG Aguilar, J Ahlen, S Alam, S Alexander, DM Alvarez, M Alves, O Anand, A https://orcid.org/0000-0003-2923-1585 Andrade, U Armengaud, E Avila, S Aviles, A Awan, H Bailey, S https://orcid.org/0000-0003-4162-6619 Baltay, C Bault, A Behera, J BenZvi, S Beutler, F Bianchi, D Blake, C Blum, R Brieden, S Brodzeller, A https://orcid.org/0000-0002-8934-0954 Brooks, D Buckley-Geer, E Burtin, E Calderon, R Canning, R Rosell, A Carnero Cereskaite, R Cervantes-Cota, JL Chabanier, S Chaussidon, E Chaves-Montero, J Chen, S Chen, X Claybaugh, T Cole, S Cuceu, A https://orcid.org/0000-0002-2169-0595 Davis, TM Dawson, K de la Macorra, A de Mattia, A Deiosso, N Dey, A Dey, B Ding, Z Doel, P Edelstein, J Eftekharzadeh, S Eisenstein, DJ Elliott, A Fagrelius, P Fanning, K Ferraro, S https://orcid.org/0000-0003-4992-7854 Ereza, J Findlay, N Flaugher, B Font-Ribera, A Forero-Sánchez, D Forero-Romero, JE Garcia-Quintero, C Garrison, LH Gaztañaga, E Gil-Marín, H Gontcho, S Gontcho A Gonzalez-Morales, AX Gonzalez-Perez, V Gordon, C Green, D Gruen, D Gsponer, R Gutierrez, G Guy, J https://orcid.org/0000-0001-9822-6793 Hadzhiyska, B Hahn, C Hanif, MMS Herrera-Alcantar, HK Honscheid, K Howlett, C Huterer, D Iršič, V Ishak, M Juneau, S Karaçaylı, NG Kehoe, R Kent, S Kirkby, D https://orcid.org/0000-0002-8828-5463 Kong, H Koposov, SE Kremin, A https://orcid.org/0000-0001-6356-7424 Krolewski, A Lai, Y Lan, T-W Landriau, M https://orcid.org/0000-0003-1838-8528 Lang, D Lasker, J Le Goff, JM Le Guillou, L https://escholarship.org/uc/item/5wc9q1rk We present cosmological results from the measurement of clustering of galaxy, quasar and Lyman-α forest tracers from the first year of observations with the Dark Energy Spectroscopic Instrument (DESI Data Release 1). We adopt the full-shape (FS) modeling of the power spectrum, including the effects of redshift-space distortions, in an analysis which has been thoroughly validated in a series of supporting papers as summarised in [1]. We combine the full-shape information with DESI's DR1 constraints from the baryon acoustic oscillations (BAO) of these tracers. In the flat ΛCDM cosmological model, DESI (FS+BAO), combined with a baryon density prior from Big Bang Nucleosynthesis and a weak prior on the scalar spectral index, determines matter density to Ωm = 0.2962 ± 0.0095, and the amplitude of mass fluctuations to σ 8 = 0.842 ± 0.034. The addition of the cosmic microwave background (CMB) data tightens these constraints to Ωm = 0.3056 ± 0.0049 and σ 8 = 0.8121 ± 0.0053, while further... https://escholarship.org/uc/item/5wc9q1rk Tue, 3 Mar 2026 00:00:00 +0000 Adame, AG Aguilar, J Ahlen, S Alam, S Alexander, DM Prieto, C Allende Alvarez, M Alves, O Anand, A https://orcid.org/0000-0003-2923-1585 Andrade, U Armengaud, E Avila, S Aviles, A Awan, H Bahr-Kalus, B Bailey, S https://orcid.org/0000-0003-4162-6619 Baltay, C Bault, A Behera, J BenZvi, S Beutler, F Bianchi, D Blake, C Blum, R Bonici, M Brieden, S Brodzeller, A https://orcid.org/0000-0002-8934-0954 Brooks, D Buckley-Geer, E Burtin, E Calderon, R Canning, R Rosell, A Carnero Cereskaite, R Cervantes-Cota, JL Chabanier, S Chaussidon, E Chaves-Montero, J Chebat, D Chen, S Chen, X Claybaugh, T Cole, S Cuceu, A https://orcid.org/0000-0002-2169-0595 Davis, TM Dawson, K de la Macorra, A de Mattia, A Deiosso, N Dey, A Dey, B Ding, Z Doel, P Edelstein, J Eftekharzadeh, S Eisenstein, DJ Elbers, W Elliott, A Fagrelius, P Fanning, K Ferraro, S https://orcid.org/0000-0003-4992-7854 Ereza, J Findlay, N Flaugher, B Font-Ribera, A Forero-Sánchez, D Forero-Romero, JE Frenk, CS Garcia-Quintero, C Garrison, LH Gaztañaga, E Gil-Marín, H Gontcho, S Gontcho A Gonzalez-Morales, AX Gonzalez-Perez, V Gordon, C Green, D Gruen, D Gsponer, R Gutierrez, G Guy, J https://orcid.org/0000-0001-9822-6793 Hadzhiyska, B Hahn, C Hanif, MMS Herrera-Alcantar, HK Honscheid, K Howlett, C Huterer, D Iršič, V Ishak, M Joyce, R Juneau, S Karaçaylı, NG Kehoe, R Kent, S Kirkby, D https://orcid.org/0000-0002-8828-5463 Kong, H Koposov, SE Kremin, A https://orcid.org/0000-0001-6356-7424 Krolewski, A https://escholarship.org/uc/item/4769b7kc The Dark Energy Spectroscopic Instrument (DESI) survey uses an automatic spectral classification pipeline to classify spectra. QuasarNET is a convolutional neural network used as part of this pipeline originally trained using data from the Baryon Oscillation Spectroscopic Survey (BOSS). In this paper we implement an active learning algorithm to optimally select spectra to use for training a new version of the QuasarNET weights file using only DESI data, with the goal of improving classification accuracy. This active learning algorithm includes a novel outlier rejection step using a Self-Organizing Map to ensure we label spectra representative of the larger quasar sample observed in DESI. We perform two iterations of the active learning pipeline, assembling a final dataset of 5600 labeled spectra, a small subset of the approximately 1.3 million quasar targets in DESI's Data Release 1. When splitting the spectra into training and validation subsets we achieve similar performance... https://escholarship.org/uc/item/4769b7kc Tue, 3 Mar 2026 00:00:00 +0000 Green, Dylan Kirkby, David https://orcid.org/0000-0002-8828-5463 Aguilar, J Ahlen, S Alexander, DM Armengaud, E Bailey, S https://orcid.org/0000-0003-4162-6619 Bault, A Bianchi, D Brodzeller, A https://orcid.org/0000-0002-8934-0954 Brooks, D Claybaugh, T de Belsunce, R de la Macorra, A Doel, P Fawcett, VA Ferraro, S https://orcid.org/0000-0003-4992-7854 Font-Ribera, A Forero-Romero, JE Gaztañaga, E Gontcho, S Gontcho A Gutierrez, G Ishak, M Juneau, S Kehoe, R Kisner, T Kremin, A https://orcid.org/0000-0003-0667-5941 Lambert, A Landriau, M https://orcid.org/0000-0003-1838-8528 Le Guillou, L Levi, ME https://orcid.org/0000-0003-1887-1018 Manera, M Meisner, A Miquel, R Moustakas, J Myers, AD Palanque-Delabrouille, N Prada, F Pérez-Ràfols, I Rossi, G Sanchez, E Saulder, C Schlegel, D Schubnell, M Seo, H Sinigaglia, F Sprayberry, D Tan, T Tarlé, G Weaver, BA Youles, S Yu, J Zhou, R https://orcid.org/0000-0001-5381-4372 Zou, H https://escholarship.org/uc/item/3655d6bp The one-dimensional power spectrum P 1D of Lyα forest offers rich insights into cosmological and astrophysical parameters, including constraints on the sum of neutrino masses, warm dark matter models, and the thermal state of the intergalactic medium. We present the measurement of P 1D using the optimal quadratic maximum likelihood estimator applied to over 300,000 Lyα quasars from Data Release 1 (DR1) of the Dark Energy Spectroscopic Instrument (DESI) survey. This sample represents the largest to date for P 1D measurements and is larger than the Extended Baryon Oscillation Spectroscopic Survey (eBOSS) by a factor of 1.7. We conduct a meticulous investigation of instrumental and analysis systematics and quantify their impact on P 1D. This includes the development of a cross-exposure estimator that eliminates the need to model the pipeline noise and has strong potential for future P 1D measurements. We also present new insights into metal contamination through the 1D correlation... https://escholarship.org/uc/item/3655d6bp Tue, 3 Mar 2026 00:00:00 +0000 Karaçaylı, Naim Göksel Martini, Paul Aguilar, J Ahlen, S Armengaud, E Bailey, S https://orcid.org/0000-0003-4162-6619 Bault, A Bianchi, D Brodzeller, A https://orcid.org/0000-0002-8934-0954 Brooks, D Chaves-Montero, J Claybaugh, T Cuceu, A https://orcid.org/0000-0002-2169-0595 de la Macorra, A Dey, A Dey, B Doel, P Ferraro, S https://orcid.org/0000-0003-4992-7854 Font-Ribera, A Forero-Romero, JE Gaztañaga, E Gontcho, S Gontcho A Gutierrez, G Guy, J https://orcid.org/0000-0001-9822-6793 Hahn, C Herrera-Alcantar, HK Honscheid, K Ishak, M Kehoe, R Kirkby, D https://orcid.org/0000-0002-8828-5463 Kremin, A https://orcid.org/0000-0003-0667-5941 Landriau, M https://orcid.org/0000-0003-1838-8528 Le Goff, JM Le Guillou, L Levi, ME https://orcid.org/0000-0003-1887-1018 Manera, M Meisner, A Miquel, R Montero-Camacho, P Nadathur, S Niz, G Palanque-Delabrouille, N Pan, Z Percival, WJ Pieri, Matthew M Prada, F Pérez-Ràfols, I Ravoux, C Rossi, G Sanchez, E Saulder, C Schlegel, D Schubnell, M Seo, H Siudek, M Sprayberry, D Tan, T Tang, Ji-Jia Tarlé, G Walther, M Weaver, BA Yu, J Zhou, R https://orcid.org/0000-0001-5381-4372 Zou, H https://escholarship.org/uc/item/5157h51h ABSTRACT The Dark Energy Spectroscopic Instrument (DESI) peculiar velocity survey aims to measure the peculiar velocities of early- and late-type galaxies within the DESI footprint using both the Fundamental Plane and optical Tully–Fisher relations. Direct measurements of peculiar velocities can significantly improve constraints on the growth rate of structure, reducing uncertainty by a factor of approximately 2.5 at redshift 0.1 compared to the DESI Bright Galaxy Survey’s redshift space distortion measurements alone. We assess the quality of stellar velocity dispersion measurements from DESI spectroscopic data. These measurements, along with photometric data from the Legacy Survey, establish the Fundamental Plane relation and determine distances and peculiar velocities of early-type galaxies. During survey validation, we obtain spectra for 6698 unique early-type galaxies, up to a photometric redshift of 0.15. 64 per cent of observed galaxies (4267) have relative velocity... https://escholarship.org/uc/item/5157h51h Tue, 24 Feb 2026 00:00:00 +0000 Said, Khaled Howlett, Cullan Davis, Tamara Lucey, John Saulder, Christoph Douglass, Kelly Kim, Alex G https://orcid.org/0000-0001-6315-8743 Kremin, Anthony https://orcid.org/0000-0001-6356-7424 Ross, Caitlin Aldering, Greg Aguilar, Jessica Nicole Ahlen, Steven BenZvi, Segev Bianchi, Davide Brooks, David Claybaugh, Todd Dawson, Kyle de la Macorra, Axel Dey, Biprateep Doel, Peter Fanning, Kevin Ferraro, Simone Font-Ribera, Andreu Forero-Romero, Jaime E Gaztañaga, Enrique Gontcho, Satya Gontcho A Guy, Julien https://orcid.org/0000-0001-9822-6793 Honscheid, Klaus Kehoe, Robert Kisner, Theodore Lambert, Andrew Landriau, Martin Le Guillou, Laurent Manera, Marc Meisner, Aaron Miquel, Ramon Moustakas, John Muñoz-Gutiérrez, Andrea Myers, Adam Nie, Jundan Palanque-Delabrouille, Nathalie Percival, Will Prada, Francisco Rossi, Graziano Sanchez, Eusebio Schlegel, David Schubnell, Michael Silber, Joseph Harry https://orcid.org/0000-0002-3461-0320 Sprayberry, David Tarlé, Gregory Magana, Mariana Vargas Weaver, Benjamin Alan Wechsler, Risa Zhou, Zhimin Zou, Hu https://escholarship.org/uc/item/6wr8s2rz We present a new method to search for strong gravitational-lensing systems by pairing spectra that are close together on the sky in a spectroscopic survey. We visually inspect 26,621 spectra in the Dark Energy Spectroscopic Instrument (DESI) Data Release 1 that are selected in this way. We further inspect the 11,848 images corresponding to these spectra in the DESI Legacy Imaging Surveys Data Release 10, and obtain 2046 conventional strong gravitational lens candidates, of which 1906 are new. This constitutes the largest sample of lens candidates identified to date in spectroscopic data. Besides the conventional candidates, we identify a new class of systems that we term “dimple lenses.” These systems have a low-mass foreground galaxy as a lens, typically smaller in angular extent and fainter compared with the lensed background source galaxy, producing subtle surface brightness indentations in the latter. We report the discovery of 318 of these “dimple lens” candidates. We suspect... https://escholarship.org/uc/item/6wr8s2rz Wed, 11 Feb 2026 00:00:00 +0000 Hsu, Yuan-Ming Huang, Xiaosheng Storfer, Christopher J Inchausti, Jose Carlos Schlegel, David https://orcid.org/0000-0002-5042-5088 Moustakas, John Aguilar, J Ahlen, S Anand, A https://orcid.org/0000-0003-2923-1585 Bailey, S https://orcid.org/0000-0003-4162-6619 Bianchi, D Brooks, D Castander, FJ Claybaugh, T Cuceu, A https://orcid.org/0000-0002-2169-0595 de la Macorra, A Della Costa, J Dey, Arjun Dey, Biprateep Doel, P Forero-Romero, JE Gaztañaga, E Gontcho, S Gontcho A Gutierrez, G Huterer, D Joyce, R Kehoe, R Kirkby, D https://orcid.org/0000-0002-8828-5463 Kisner, T Kremin, A https://orcid.org/0000-0003-0667-5941 Lahav, O Landriau, M https://orcid.org/0000-0003-1838-8528 Le Guillou, L Manera, M Meisner, A Miquel, R Nadathur, S Palanque-Delabrouille, N Percival, WJ Prada, F Pérez-Ràfols, I Rossi, G Sanchez, E Schubnell, M Silber, J https://orcid.org/0000-0002-3461-0320 Sprayberry, D Tarlé, G Weaver, BA Zhou, R https://orcid.org/0000-0001-5381-4372 Zou, H https://escholarship.org/uc/item/9x16p56f We present an analysis of DESI Data Release 1 (DR1) that incorporates Halo Occupation Distribution (HOD)-informed priors into Full-Shape (FS) modeling of the power spectrum based on cosmological perturbation theory (PT). By leveraging physical insights from the galaxy-halo connection, these HOD-informed priors on nuisance parameters substantially mitigate projection effects in extended cosmological models that allow for dynamical dark energy. The resulting credible intervals now encompass the posterior maximum from the baseline analysis using gaussian priors, eliminating a significant posterior shift observed in baseline studies. In the ΛCDM framework, a combined DESI DR1 FS information and constraints from the DESI DR1 baryon acoustic oscillations (BAO) — including Big Bang Nucleosynthesis (BBN) constraints and a weak prior on the scalar spectral index — yields Ωm = 0.2994 ± 0.0090 and σ 8 = 0.836+0.024 -0.027, representing improvements of approximately 4% and 23% over the baseline... https://escholarship.org/uc/item/9x16p56f Mon, 8 Dec 2025 00:00:00 +0000 Zhang, H Bonici, M Rocher, A Percival, WJ de Mattia, A Aguilar, J Ahlen, S Alves, O Aviles, A Lizancos, A Baleato Bianchi, D Brooks, D Cuceu, A https://orcid.org/0000-0002-2169-0595 de la Macorra, A Doel, P Ferraro, S https://orcid.org/0000-0003-4992-7854 Findlay, N Font-Ribera, A Forero-Sánchez, D Forero-Romero, JE Gontcho, S Gontcho A Gutierrez, G Hahn, C Howlett, C Ishak, M Karamanis, M Kehoe, R Kirkby, D https://orcid.org/0000-0002-8828-5463 Kremin, A https://orcid.org/0000-0003-0667-5941 Lahav, O Lai, Y Landriau, M https://orcid.org/0000-0003-1838-8528 Le Guillou, L Levi, ME https://orcid.org/0000-0003-1887-1018 Manera, M Maus, M Meisner, A Miquel, R Morawetz, J Moustakas, J Nadathur, S Newman, JA Niz, G Noriega, HE Palanque-Delabrouille, N Pinon, M Prada, F Pérez-Ràfols, I Rossi, G Saito, S Samushia, L Sanchez, E Schlegel, D Schubnell, M Seo, H Sprayberry, D Tarlé, G Weaver, BA Zhao, R Zhou, R https://orcid.org/0000-0001-5381-4372 https://escholarship.org/uc/item/4rv2893g We analyse the robustness of the DESI 2024 cosmological inference from the full shape of the galaxy power spectrum to uncertainties in the Halo Occupation Distribution (HOD) model of the galaxy-halo connection and the choice of priors on nuisance parameters. We assess variations in the recovered cosmological parameters across a range of mocks populated with different HOD models and find that shifts are often greater than 20% of the expected statistical uncertainties from the DESI data. We encapsulate the effect of such shifts in terms of a systematic covariance term, CHOD, and an additional diagonal contribution quantifying the impact of our choice of nuisance parameter priors on the ability of the effective field theory (EFT) model to correctly recover the cosmological parameters of the simulations. These two covariance contributions are designed to be added to the usual covariance term, Cstat, describing the statistical uncertainty in the power spectrum measurement, in order... https://escholarship.org/uc/item/4rv2893g Mon, 8 Dec 2025 00:00:00 +0000 Findlay, N Nadathur, S Percival, WJ de Mattia, A Zarrouk, P Gil-Marín, H Alves, O Mena-Fernández, J Garcia-Quintero, C Rocher, A Ahlen, S Bianchi, D Brooks, D Claybaugh, T Cole, S de la Macorra, A Dey, A Doel, P Fanning, K Font-Ribera, A Forero-Romero, JE Gaztañaga, E Gutierrez, G Hahn, C Honscheid, K Howlett, C Juneau, S Levi, ME https://orcid.org/0000-0003-1887-1018 Meisner, A Miquel, R Moustakas, J Palanque-Delabrouille, N Pérez-Ràfols, I Rossi, G Sanchez, E Schlegel, D Schubnell, M Seo, H Sprayberry, D Tarlé, G Vargas-Magaña, M Weaver, BA https://escholarship.org/uc/item/67q6j3gf We report cosmological results from the Dark Energy Spectroscopic Instrument (DESI) measurements of baryon acoustic oscillations (BAO) when combined with recent data from the Atacama Cosmology Telescope (ACT). By jointly analyzing ACT and data and applying conservative cuts to overlapping multipole ranges, we assess how different dataset combinations affect consistency with DESI. While ACT alone exhibits a tension with DESI exceeding within the model, this discrepancy is reduced when ACT is analyzed in combination with . For our baseline DESI DR2 likelihood combination, the preference for evolving dark energy over a cosmological constant is about , increasing to over with the inclusion of type Ia supernova data. While the dark energy results remain quite consistent across various combinations of and ACT likelihoods with those obtained by the DESI collaboration, the constraints on neutrino mass are more sensitive, ranging from in our baseline analysis, to (95% confidence... https://escholarship.org/uc/item/67q6j3gf Thu, 4 Dec 2025 00:00:00 +0000 Garcia-Quintero, C Noriega, HE de Mattia, A Aviles, A Lodha, K Chebat, D Rohlf, J Nadathur, S Elbers, W Aguilar, J Ahlen, S Alves, O Andrade, U Bailey, S https://orcid.org/0000-0003-4162-6619 BenZvi, S Bianchi, D Brooks, D Burtin, E Calderon, R Rosell, A Carnero Carrilho, P Castander, FJ Chaussidon, E Claybaugh, T Cole, S Cuceu, A de Belsunce, R de la Macorra, A Deiosso, N Della Costa, J Dey, Arjun Dey, Biprateep Ding, Z Doel, P Font-Ribera, A Forero-Romero, JE Gaztañaga, E Gil-Marín, H Gontcho, S Gontcho A Gutierrez, G Guy, J https://orcid.org/0000-0001-9822-6793 Hahn, C Herrera-Alcantar, HK Honscheid, K Howlett, C Huterer, D Ishak, M Juneau, S Kehoe, R Kirkby, D https://orcid.org/0000-0002-8828-5463 Kremin, A https://orcid.org/0000-0003-0667-5941 Lahav, O Lamman, C Landriau, M Le Guillou, L Leauthaud, A Levi, ME Li, Q Manera, M Martini, P Matthewson, WL Meisner, A Mena-Fernández, J Miquel, R Moustakas, J Muñoz-Gutiérrez, A Newman, JA Niz, G Paillas, E Palanque-Delabrouille, N Pan, J Percival, WJ Prada, F Pérez-Ràfols, I Rashkovetskyi, M Ravoux, C Ross, AJ Rossi, G Sanchez, E Schlegel, D Schubnell, M Seo, H Shafieloo, A Silber, J https://orcid.org/0000-0002-3461-0320 Sprayberry, D Tarlé, G Taylor, P Vargas-Magaña, M Walther, M Weaver, BA Yèche, C Zarrouk, P Zhai, Z Zhao, C Zhou, R https://escholarship.org/uc/item/4338r7m1 We measure the projected two-point correlation functions of emission-line galaxies (ELGs) from the Dark Energy Spectroscopic Instrument One-Percent Survey and model their dependence on stellar mass and [O II] luminosity. We select ∼180,000 ELGs with redshifts of 0.8 < z < 1.6, and define 27 samples according to cuts in redshift and both galaxy properties. Following a framework that describes the conditional [O II] luminosity–stellar mass distribution as a function of halo mass, we simultaneously model the clustering measurements of all samples at fixed redshift. Based on the modeling result, most ELGs in our samples are classified as central galaxies, residing in halos of a narrow mass range with a typical median of ∼1012.2−12.4 h−1 M⊙. We observe a weak dependence of clustering amplitude on stellar mass, which is reflected in the model constraints and is likely a consequence of the 0.5 dex measurement uncertainty in the stellar mass estimates. The model shows a trend between... https://escholarship.org/uc/item/4338r7m1 Thu, 4 Dec 2025 00:00:00 +0000 Hagen, T Dawson, KS Zheng, Z Aguilar, J Ahlen, S BenZvi, S Bianchi, D Brooks, D Castander, FJ Claybaugh, T Cuceu, A https://orcid.org/0000-0002-2169-0595 de la Macorra, A Doel, P Ferraro, S https://orcid.org/0000-0003-4992-7854 Font-Ribera, A Forero-Romero, JE Gaztañaga, E Gontcho, S Gontcho A Gonzalez-Perez, V Gutierrez, G Hahn, C Honscheid, K Ishak, M Juneau, S Kehoe, R Kisner, T Kremin, A https://orcid.org/0000-0003-0667-5941 Lamman, C Landriau, M https://orcid.org/0000-0003-1838-8528 Le Guillou, L Leauthaud, A Levi, ME https://orcid.org/0000-0003-1887-1018 Manera, M Meisner, A Miquel, R Moustakas, J Nadathur, S Palanque-Delabrouille, N Prada, F Pérez-Ràfols, I Ross, AJ Rossi, G Saito, S Sanchez, E Schlegel, D https://orcid.org/0000-0002-5042-5088 Schubnell, M Silber, J https://orcid.org/0000-0002-3461-0320 Sprayberry, D Tarlé, G Weaver, BA Zhou, R https://orcid.org/0000-0001-5381-4372 Zou, H https://escholarship.org/uc/item/0h61r8f2 We present a measurement of the amplitude of matter fluctuations over the redshift range 0.8 ≤ z ≤ 3.5 from the cross correlation of over 1.2 million spectroscopic quasars selected by the Dark Energy Spectroscopic Instrument (DESI) across 7,200 deg2 (∼ 170 quasars/deg2) and Planck PR4 (NPIPE) cosmic microwave background (CMB) lensing maps. We perform a tomographic measurement in three bins centered at effective redshifts z=1.44, 2.27 and 2.75, which have ample overlap with the CMB lensing kernel. From a joint fit using the angular clustering of all three redshift bins (auto and cross-spectra), and including an prior from DESI DR1 baryon acoustic oscillations to break the degeneracy, we constrain the amplitude of matter fluctuations in the matter-dominated regime to be and . We provide a growth of structure measurement with the largest spectroscopic quasar sample to date at high redshift, which is ∼ 1.5σ higher than predictions from ΛCDM fits to measurements of the primary CMB... https://escholarship.org/uc/item/0h61r8f2 Thu, 4 Dec 2025 00:00:00 +0000 de Belsunce, R Krolewski, A Chaussidon, E Ferraro, S https://orcid.org/0000-0003-4992-7854 Farren, G https://orcid.org/0000-0001-5704-1127 Hadzhiyska, B Tamone, A Chiarenza, S Sailer, N Ravoux, C Aguilar, J Ahlen, S Bianchi, D Brooks, D Claybaugh, T Cuceu, A https://orcid.org/0000-0002-2169-0595 de la Macorra, A Della Costa, J Dey, Biprateep Doel, P Font-Ribera, A Forero-Romero, JE Gaztañaga, E Gontcho, S Gontcho A Gutierrez, G Guy, J https://orcid.org/0000-0001-9822-6793 Herrera-Alcantar, HK Honscheid, K Ishak, M Joyce, R Juneau, S Kehoe, R Kirkby, D https://orcid.org/0000-0002-8828-5463 Kisner, T Kremin, A https://orcid.org/0000-0003-0667-5941 Lahav, O Lambert, A Lamman, C Landriau, M https://orcid.org/0000-0003-1838-8528 Le Guillou, L Levi, ME https://orcid.org/0000-0003-1887-1018 Manera, M Martini, P Meisner, A Miquel, R Nadathur, S Niz, G Palanque-Delabrouille, N Percival, WJ Prada, F Pérez-Ràfols, I Ross, AJ Rossi, G Sanchez, E Schlegel, D Schubnell, M Seo, H Silber, J https://orcid.org/0000-0002-3461-0320 Sprayberry, D Tarlé, G Weaver, BA Zhou, R https://orcid.org/0000-0001-5381-4372 Zou, H https://escholarship.org/uc/item/0731f0dr Motivated by the profound impact of laser technology on science, arising from an increase in focused light intensity by seven orders of magnitude and flashes so short electron motion is visible, this roadmap outlines the paths forward in laser technology to enable the next generation of science and applications. Despite remarkable progress, the field confronts challenges in developing compact, high-power sources, enhancing scalability and efficiency, and ensuring safety standards. Future research endeavors aim to revolutionize laser power, energy, repetition rate and precision control; to transform mid-infrared sources; to revolutionize approaches to field control and frequency conversion. These require reinvention of materials and optics to enable intense laser science and interdisciplinary collaboration. The roadmap underscores the dynamic nature of laser technology and its potential to address global challenges, propelling progress and fostering sustainable development. Ultimately,... https://escholarship.org/uc/item/0731f0dr Wed, 3 Dec 2025 00:00:00 +0000 Kling, Matthias F Menoni, Carmen S Geddes, Cameron Galvanauskas, Almantas Albert, Felicie Kiani, Leily Chini, Michael Baker, L Robert Nelson, Keith A Young, Linda Moses, Jeffrey Carbajo, Sergio https://orcid.org/0000-0002-5292-4470 Demos, Stavros G Dollar, Franklin https://orcid.org/0000-0003-3346-5763 Schumacher, Douglass Tsai, Janet Y Fry, Alan R Zuegel, Jonathan D https://escholarship.org/uc/item/9v10m4rv ABSTRACT Surveys of cosmological large-scale structure (LSS) are sensitive to the presence of local primordial non-Gaussianity (PNG), and may be used to constrain models of inflation. Local PNG, characterized by $f_{\mathrm{NL}}$, the amplitude of the quadratic correction to the potential of a Gaussian random field, is traditionally measured from LSS two-point and three-point clustering via the power spectrum and bi-spectrum. We propose a framework to measure $f_{\mathrm{NL}}$ using the configuration space two-point correlation function (2pcf) monopole and three-point correlation function (3pcf) monopole of survey tracers. Our model estimates the effect of the scale-dependent bias induced by the presence of PNG on the 2pcf and 3pcf from the clustering of simulated dark matter haloes. We describe how this effect may be scaled to an arbitrary tracer of the cosmological matter density. The 2pcf and 3pcf of this tracer are measured to constrain the value of $f_{\mathrm{NL}}$. In LSS... https://escholarship.org/uc/item/9v10m4rv Mon, 1 Dec 2025 00:00:00 +0000 Brown, Z Demina, R Adame, AG Avila, S Chaussidon, E Yuan, S Gonzalez-Perez, V García-Bellido, J Levi, B Aguilar, J Ahlen, S Blum, R Brooks, D Claybaugh, T Cole, S de la Macorra, A Dey, B Doel, P Fanning, K Forero-Romero, JE Gaztañaga, E Gontcho, S Gontcho A Honscheid, K Howlett, C Juneau, S Kehoe, R Kisner, T Landriau, M Le Guillou, L Manera, M Miquel, R Mueller, E Muñoz-Gutièrrez, A Myers, AD Nie, J Niz, G Palanque-Delabrouille, N Poppett, C Rezaie, M Rossi, G Sanchez, E Schlafly, E https://orcid.org/0000-0002-3569-7421 Schlegel, D Schubnell, M Silber, JH https://orcid.org/0000-0002-3461-0320 Sprayberry, D Tarlé, G Vargas-Magaña, M Weaver, BA Zhou, Z Zou, H https://escholarship.org/uc/item/7b28f5hr The thermal Sunyaev-Zeldovich (tSZ) effect is associated with galaxy clusters - extremely large and dense structures tracing the dark matter with a higher bias than isolated galaxies. We propose to use the tSZ data to separate galaxies from redshift surveys into distinct subpopulations corresponding to different densities and biases independently of the redshift survey systematics. Leveraging the information from different environments, as in density-split and density-marked clustering, is known to tighten the constraints on cosmological parameters, like , and neutrino mass. We use data from the Dark Energy Spectroscopic Instrument (DESI) and the Atacama Cosmology Telescope (ACT) in their region of overlap to demonstrate informative tSZ splitting of Luminous Red Galaxies (LRGs). We discover a significant increase in the large-scale clustering of DESI LRGs corresponding to detections starting from 1-2 sigma in the ACT DR6 + Planck tSZ Compton- map, below the cluster candidate... https://escholarship.org/uc/item/7b28f5hr Mon, 1 Dec 2025 00:00:00 +0000 Rashkovetskyi, Michael Eisenstein, Daniel J Aguilar, Jessica Nicole Ahlen, Steven Anand, Abhijeet https://orcid.org/0000-0003-2923-1585 Bianchi, Davide Brooks, David Castander, Francisco Javier Claybaugh, Todd Cuceu, Andrei https://orcid.org/0000-0002-2169-0595 Dawson, Kyle S de la Macorra, Axel Dey, Arjun Doel, Peter Ferraro, Simone https://orcid.org/0000-0003-4992-7854 Font-Ribera, Andreu Forero-Romero, Jaime E Gaztañaga, Enrique Gutierrez, Gaston Herrera-Alcantar, Hiram K Honscheid, Klaus Howlett, Cullan Ishak, Mustapha Joyce, Richard Kehoe, Robert Kisner, Theodore Kremin, Anthony https://orcid.org/0000-0003-0667-5941 Lahav, Ofer Lambert, Andrew Landriau, Martin https://orcid.org/0000-0003-1838-8528 Manera, Marc Miquel, Ramon Mueller, Eva-Maria Nadathur, Seshadri Palanque-Delabrouille, Nathalie Percival, Will J Prada, Francisco Pérez-Ràfols, Ignasi Ross, Ashley J Rossi, Graziano Sanchez, Eusebio Schlegel, David Schubnell, Michael Silber, Joseph Harry https://orcid.org/0000-0002-3461-0320 Sprayberry, David Tarlé, Gregory Weaver, Benjamin Alan Zhou, Rongpu https://orcid.org/0000-0001-5381-4372 Zou, Hu https://escholarship.org/uc/item/28z4k02h The Dark Energy Spectroscopic Instrument (DESI) Collaboration has obtained robust measurements of baryon acoustic oscillations in the redshift range , based on the Lyman- forest and galaxies from data release 2. We combine these measurements with cosmic microwave background (CMB) data from and the Atacama Cosmology Telescope to place our tightest constraints yet on the sum of neutrino masses. Assuming the cosmological model and three degenerate neutrino states, we find (95%) with a marginalized error of . We also constrain the effective number of neutrino species, finding (95%), in line with the Standard Model prediction. When accounting for neutrino oscillation constraints, we find a preference for the normal mass ordering and an upper limit on the lightest neutrino mass of (95%). However, we determine using frequentist and Bayesian methods that our constraints are in tension with the lower limits derived from neutrino oscillations. Correcting for the physical boundary... https://escholarship.org/uc/item/28z4k02h Mon, 1 Dec 2025 00:00:00 +0000 Elbers, W Aviles, A Noriega, HE Chebat, D Menegas, A Frenk, CS Garcia-Quintero, C Gonzalez, D Ishak, M Lahav, O Naidoo, K Niz, G Yèche, C Abdul-Karim, M Ahlen, S Alves, O Andrade, U Armengaud, E Behera, J BenZvi, S Bianchi, D Brieden, S Brodzeller, A https://orcid.org/0000-0002-8934-0954 Brooks, D Burtin, E Calderon, R Canning, R Rosell, A Carnero Casas, L Castander, FJ Charles, M Chaussidon, E Chaves-Montero, J Claybaugh, T Cole, S Cooper, AP Cuceu, A Dawson, KS de la Macorra, A de Mattia, A Deiosso, N Dey, A Dey, B Ding, Z Doel, P Eisenstein, DJ Ferraro, S Font-Ribera, A Forero-Romero, JE Garrison, LH Gaztañaga, E Gil-Marín, H Gontcho, S Gontcho A Gonzalez-Morales, AX Gutierrez, G He, S Herbold, M Herrera-Alcantar, HK Howlett, C Huterer, D Juneau, S Kehoe, R Kirkby, D https://orcid.org/0000-0002-8828-5463 Kisner, T Kremin, A https://orcid.org/0000-0003-0667-5941 Lamman, C Landriau, M Le Guillou, L Leauthaud, A Levi, ME Li, Q Lodha, K Magneville, C Manera, M Martini, P Matthewson, WL Meisner, A Mena-Fernández, J Miquel, R Moustakas, J Nadathur, S Newman, JA Paillas, E Palanque-Delabrouille, N Percival, WJ Pieri, MM Poppett, C Prada, F Pérez-Ràfols, I Rabinowitz, D Ramírez-Pérez, C Rashkovetskyi, M Ravoux, C Rivera-Morales, H Rohlf, J Ross, AJ Rossi, G Ruhlmann-Kleider, V Samushia, L Sanchez, E https://escholarship.org/uc/item/1kq3b8gz We conduct an extended analysis of dark energy constraints, in support of the findings of the Dark Energy Spectroscopic Instrument (DESI) second data release cosmology key paper, including DESI data, Planck cosmic microwave background observations, and three different supernova compilations. Using a broad range of parametric and nonparametric methods, we explore the dark energy phenomenology and find consistent trends across all approaches, in good agreement with the w0waCDM (cold dark matter) key paper results. Even with the additional flexibility introduced by nonparametric approaches, such as binning and Gaussian processes, we find that extending ΛCDM to include a two-parameter w(z) is sufficient to capture the trends present in the data. Finally, we examine three dark energy classes with distinct dynamics, including quintessence scenarios satisfying w≥-1, to explore what underlying physics can explain such deviations. The current data indicate a clear preference for models... https://escholarship.org/uc/item/1kq3b8gz Thu, 20 Nov 2025 00:00:00 +0000 Lodha, K Calderon, R Matthewson, WL Shafieloo, A Ishak, M Pan, J Garcia-Quintero, C Huterer, D Valogiannis, G Ureña-López, LA Kamble, NV Parkinson, D Kim, AG https://orcid.org/0000-0001-6315-8743 Zhao, GB Cervantes-Cota, JL Rohlf, J Lozano-Rodríguez, F Román-Herrera, JO Abdul-Karim, M Aguilar, J Ahlen, S Alves, O Andrade, U Armengaud, E Aviles, A Behera, J BenZvi, S Bianchi, D Brodzeller, A https://orcid.org/0000-0002-8934-0954 Brooks, D Burtin, E Canning, R Rosell, A Carnero Casas, L Castander, FJ Charles, M Chaussidon, E Chaves-Montero, J Chebat, D Claybaugh, T Cole, S Cuceu, A Dawson, KS de la Macorra, A de Mattia, A Deiosso, N Demina, R Dey, Arjun Dey, Biprateep Ding, Z Doel, P Eisenstein, DJ Elbers, W Ferraro, S Font-Ribera, A Forero-Romero, JE Garrison, Lehman H Gaztañaga, E Gil-Marín, H Gontcho, S Gontcho A Gonzalez-Morales, AX Gutierrez, G Guy, J https://orcid.org/0000-0001-9822-6793 Hahn, C Herbold, M Herrera-Alcantar, HK Honscheid, K Howlett, C Juneau, S Kehoe, R Kirkby, D https://orcid.org/0000-0002-8828-5463 Kisner, T Kremin, A https://orcid.org/0000-0001-6356-7424 Lahav, O Lamman, C Landriau, M Le Guillou, L Leauthaud, A Levi, ME Li, Q Magneville, C Manera, M Martini, P Meisner, A Mena-Fernández, J Miquel, R Moustakas, J Santos, D Muñoz Muñoz-Gutiérrez, A Myers, AD Nadathur, S Niz, G Noriega, HE Paillas, E Palanque-Delabrouille, N Percival, WJ Pieri, Matthew M Poppett, C Prada, F Pérez-Fernández, A https://escholarship.org/uc/item/46b0d4cc The Dark Energy Spectroscopic Instrument (DESI) Data Release 2 (DR2) galaxy and quasar clustering data represents a significant expansion of data from Data Release 1 (DR1), providing improved statistical precision in baryon acoustic oscillation (BAO) constraints across multiple tracers, including bright galaxies, luminous red galaxies, emission line galaxies, and quasars. In this paper, we validate the BAO analysis of DR2. We present the results of robustness tests on the blinded DR2 data and, after unblinding, consistency checks on the unblinded DR2 data. All results are compared with those obtained from a suite of mock catalogs that replicate the selection and clustering properties of the DR2 sample. We confirm the consistency of DR2 BAO measurements with DR1 while achieving a reduction in statistical uncertainties due to the increased survey volume and completeness. The combined BAO precision, including both statistical and systematic errors, improves from ∼0.52% in DR1 to... https://escholarship.org/uc/item/46b0d4cc Tue, 21 Oct 2025 00:00:00 +0000 Andrade, U Paillas, E Mena-Fernández, J Li, Q Ross, AJ Nadathur, S Rashkovetskyi, M Pérez-Fernández, A Seo, H Sanders, N Alves, O Chen, X Deiosso, N de Mattia, A White, M https://orcid.org/0000-0001-9912-5070 Karim, M Abdul Ahlen, S Armengaud, E Aviles, A Bansal, P Behera, J Bianchi, D Brieden, S Brodzeller, A https://orcid.org/0000-0002-8934-0954 Brooks, D Burtin, E Calderon, R Canning, R Rosell, A Carnero Casas, L Castander, FJ Charles, M Chaussidon, E Chaves-Montero, J Claybaugh, T Cole, S Cooper, AP Cuceu, A https://orcid.org/0000-0002-2169-0595 Dawson, KS de la Macorra, A Della Costa, J Dey, A Dey, B Ding, Z Doel, P Eisenstein, DJ Elbers, W Fernández-García, E Ferraro, S https://orcid.org/0000-0003-4992-7854 Font-Ribera, A Forero-Romero, JE Garcia-Quintero, C Garrison, LH Gaztañaga, E Gil-Marín, H Gontcho, S Gontcho A Gonzalez-Morales, AX Gordon, C Gutierrez, G Guy, J https://orcid.org/0000-0001-9822-6793 Hahn, C He, S Herrera-Alcantar, HK Honscheid, K Howlett, C Huterer, D Ishak, M Juneau, S Kehoe, R Kirkby, D https://orcid.org/0000-0002-8828-5463 Kisner, T Kremin, A https://orcid.org/0000-0001-6356-7424 Lahav, O Lamman, C Landriau, M https://orcid.org/0000-0003-1838-8528 Le Guillou, L Leauthaud, A Levi, ME https://orcid.org/0000-0003-1887-1018 Magneville, C Manera, M Martini, P Matthewson, WL Meisner, A Miquel, R Moustakas, J Muñoz-Gutiérrez, A Muñoz-Santos, D Myers, AD Napolitano, L Newman, JA Noriega, HE Palanque-Delabrouille, N Pan, J Percival, WJ Pérez-Ràfols, I Poppett, C Prada, F Raichoor, A https://orcid.org/0000-0001-5999-7923 Ramírez-Pérez, C Ravoux, C https://escholarship.org/uc/item/0fv331g6 We present baryon acoustic oscillation (BAO) measurements from more than 14 million galaxies and quasars drawn from the Dark Energy Spectroscopic Instrument (DESI) Data Release 2 (DR2), based on three years of operation. For cosmology inference, these galaxy measurements are combined with DESI Lyman-α forest BAO results presented in a companion paper (M. Abdul-Karim et al., companion paper, Phys. Rev. D 112, 083514 202510.1103/2wwn-xjm5.). The DR2 BAO results are consistent with DESI DR1 and the Sloan Digital Sky Survey, and their distance-redshift relationship matches those from recent compilations of supernovae (SNe) over the same redshift range. The results are well described by a flat Λ cold dark matter (ΛCDM) model, but the parameters preferred by BAO are in mild, 2.3σ tension with those determined from the cosmic microwave background (CMB), although the DESI results are consistent with the acoustic angular scale θ* that is well measured by Planck. This tension is alleviated... https://escholarship.org/uc/item/0fv331g6 Tue, 21 Oct 2025 00:00:00 +0000 Karim, M Abdul Aguilar, J Ahlen, S Alam, S Allen, L Prieto, C Allende Alves, O Anand, A Andrade, U Armengaud, E Aviles, A Bailey, S https://orcid.org/0000-0003-4162-6619 Baltay, C Bansal, P Bault, A Behera, J BenZvi, S Bianchi, D Blake, C Brieden, S Brodzeller, A https://orcid.org/0000-0002-8934-0954 Brooks, D Buckley-Geer, E Burtin, E Calderon, R Canning, R Rosell, A Carnero Carrilho, P Casas, L Castander, FJ Charles, M Chaussidon, E Chaves-Montero, J Chebat, D Chen, X Claybaugh, T Cole, S Cooper, AP Cuceu, A https://orcid.org/0000-0002-2169-0595 Dawson, KS de la Macorra, A de Mattia, A Deiosso, N Della Costa, J Demina, R Dey, A Dey, B Ding, Z Doel, P Edelstein, J Eisenstein, DJ Elbers, W Fagrelius, P Fanning, K Fernández-García, E Ferraro, S https://orcid.org/0000-0003-4992-7854 Font-Ribera, A Forero-Romero, JE Frenk, CS Garcia-Quintero, C Garrison, LH Gaztañaga, E Gil-Marín, H Gontcho, S Gontcho A Gonzalez, D Gonzalez-Morales, AX Gordon, C Green, D Gutierrez, G Guy, J https://orcid.org/0000-0001-9822-6793 Hadzhiyska, B Hahn, C He, S Herbold, M Herrera-Alcantar, HK Ho, M-F Honscheid, K Howlett, C Huterer, D Ishak, M Juneau, S Kamble, NV Karaçayl?, NG Kehoe, R Kent, S Kim, AG https://orcid.org/0000-0001-6315-8743 Kirkby, D https://orcid.org/0000-0002-8828-5463 Kisner, T Koposov, SE Kremin, A https://orcid.org/0000-0001-6356-7424 Krolewski, A Lahav, O Lamman, C Landriau, M https://orcid.org/0000-0003-1838-8528 Lang, D Lasker, J Le Goff, JM Le Guillou, L Leauthaud, A Levi, ME https://orcid.org/0000-0003-1887-1018 https://escholarship.org/uc/item/07d6532s We present the Damped Lyα Toolkit for automated detection and characterization of damped Lyα absorbers (DLAs) in quasar spectra. Our method uses quasar spectral templates with and without absorption from intervening DLAs to reconstruct observed quasar forest regions. The best-fitting model determines whether a DLA is present while estimating the redshift and HI column density. With an optimized quality cut on detection significance (Δχr2>0.03), the technique achieves an estimated 80% purity and 79% completeness when evaluated on simulated spectra with S/N>2 that are free of broad absorption lines (BALs). We provide a catalog containing candidate DLAs from the DLA Toolkit detected in DESI DR1 quasar spectra, of which 21 719 were found in S/N>2 spectra with predicted log10(NHI)>20.3 and detection significance Δχr2>0.03. We compare the Damped Lyα Toolkit to two alternative DLA finders based on a convolutional neural network and Gaussian process models. We present a... https://escholarship.org/uc/item/07d6532s Tue, 21 Oct 2025 00:00:00 +0000 Brodzeller, A https://orcid.org/0000-0002-8934-0954 Wolfson, M Santos, DM Ho, M Tan, T Pieri, MM Cuceu, A https://orcid.org/0000-0002-2169-0595 Abdul-Karim, M Aguilar, J Ahlen, S Anand, A Andrade, U Armengaud, E Aviles, A Bailey, S https://orcid.org/0000-0003-4162-6619 Bault, A Bianchi, D Brooks, D Canning, R Casas, L Charles, M Chaussidon, E Chaves-Montero, J Chebat, D Claybaugh, T Dawson, KS de Belsunce, R de la Macorra, A de Mattia, A Dey, Arjun Dey, Biprateep Doel, P Doshi, M Elbers, W Ferraro, S https://orcid.org/0000-0003-4992-7854 Font-Ribera, A Forero-Romero, JE Garcia-Quintero, C Garrison, LH Gaztañaga, E Gontcho, S Gontcho A Gonzalez-Morales, AX Green, D Gutierrez, G Guy, J https://orcid.org/0000-0001-9822-6793 Hahn, C Herbold, M Herrera-Alcantar, HK Honscheid, K Howlett, C Huterer, D Ishak, M Juneau, S Kehoe, R Kisner, T Kremin, A https://orcid.org/0000-0001-6356-7424 Lahav, O Lamman, C Landriau, M https://orcid.org/0000-0003-1838-8528 Le Goff, JM Le Guillou, L Leauthaud, A Levi, ME https://orcid.org/0000-0003-1887-1018 Li, Q Manera, M Martini, P Meisner, A Mena-Fernández, J Miquel, R Moustakas, J Muñoz-Gutiérrez, A Myers, AD Nadathur, S Napolitano, L Noriega, HE Paillas, E Palanque-Delabrouille, N Percival, WJ Poppett, C Prada, F Pérez-Ràfols, I Ramírez-Pérez, C Ravoux, C Rohlf, J Rossi, G Sanchez, E Schlegel, D Schubnell, M Sinigaglia, F Sprayberry, D Tarlé, G Taylor, P Turner, W Walther, M Weaver, BA Yèche, C Zhou, R https://orcid.org/0000-0001-5381-4372 Zou, H Zou, S https://escholarship.org/uc/item/3s5718h2 We introduce a deep-learning method for modeling dynamic gain and nonlinearities in ultrafast fiber a mplifiers, ov ercoming li mitations of ph ysics-based models. Trained and tested with experiments, the algorithm can predict accurately, adaptable to varying amplifier conditions. https://escholarship.org/uc/item/3s5718h2 Tue, 26 Aug 2025 00:00:00 +0000 Chen, Siyun https://orcid.org/0000-0001-5480-5048 Wang, Dan Du, Qiang https://orcid.org/0000-0002-2196-9801 Logantha, Mahek Kong, Fanting Cooper, Lauren Galvanauskas, Almantas Liu, Andy Ji, Qing van Tilborg, Jeroen Schroeder, Carl Esarey, Eric Wilcox, Russell Zhou, Tong Geddes, Cameron https://escholarship.org/uc/item/7nv6c95n We analyse the large-scale clustering of the Luminous Red Galaxy (LRG) and Quasar (QSO) sample from the first data release (DR1) of the Dark Energy Spectroscopic Instrument (DESI). In particular, we constrain the primordial non-Gaussianity (PNG) parameter f NL loc via the large-scale scale-dependent bias in the power spectrum using 1,631,716 LRGs (0.6 < z < 1.1) and 1,189,129 QSOs (0.8 < z < 3.1). This new measurement takes advantage of the enormous statistical power at large scales of DESI DR1 data, surpassing the latest data release (DR16) of the extended Baryon Oscillation Spectroscopic Survey (eBOSS). For the first time in this kind of analysis, we use a blinding procedure to mitigate the risk of confirmation bias in our results. We improve the model of the radial integral constraint proposing an innovative technique allowing the correction through the window matrix convolution. We also carefully test the mitigation of the dependence of the target selection on... https://escholarship.org/uc/item/7nv6c95n Fri, 15 Aug 2025 00:00:00 +0000 Chaussidon, E Yèche, C de Mattia, A Payerne, C McDonald, P https://orcid.org/0000-0001-8346-8394 Ross, AJ Ahlen, S Bianchi, D Brooks, D Burtin, E Claybaugh, T de la Macorra, A Doel, P Ferraro, S https://orcid.org/0000-0003-4992-7854 Font-Ribera, A Forero-Romero, JE Gaztañaga, E Gil-Marín, H Gontcho, S Gontcho A Gutierrez, G Guy, J https://orcid.org/0000-0001-9822-6793 Honscheid, K Howlett, C Huterer, D Kehoe, R Kirkby, D https://orcid.org/0000-0002-8828-5463 Kisner, T Kremin, A https://orcid.org/0000-0001-6356-7424 Le Guillou, L Levi, ME https://orcid.org/0000-0003-1887-1018 Manera, M Meisner, A Miquel, R Moustakas, J Newman, JA Niz, G Palanque-Delabrouille, N Percival, WJ Prada, F Pérez-Ràfols, I Ravoux, C Rossi, G Sanchez, E Schlegel, D Schubnell, M Seo, H Sprayberry, D Tarlé, G Vargas-Magaña, M Weaver, BA Zhao, C Zou, H https://escholarship.org/uc/item/9n46h42z Measuring the growth of structure is a powerful probe for studying the dark sector, especially in light of the σ 8 tension between primary CMB anisotropy and low-redshift surveys. This paper provides a new measurement of the amplitude of the matter power spectrum, σ 8, using galaxy-galaxy and galaxy-CMB lensing power spectra of Dark Energy Spectroscopic Instrument Legacy Imaging Surveys Emission-Line Galaxies and the Planck 2018 CMB lensing map. We create an ELG catalog composed of 24 million galaxies and with a purity of 85%, covering a redshift range 0 < z < 3, with z mean = 1.09. We implement several novel systematic corrections, such as jointly modeling the contribution of imaging systematics and photometric redshift uncertainties to the covariance matrix. We also study the impacts of various dust maps on cosmological parameter inference. We measure the cross-power spectra over f sky = 0.25 with a signal-to-background ratio of up to 30σ. We find that the choice of dust... https://escholarship.org/uc/item/9n46h42z Thu, 17 Jul 2025 00:00:00 +0000 Karim, Tanveer Singh, Sukhdeep Rezaie, Mehdi Eisenstein, Daniel Hadzhiyska, Boryana Speagle, Joshua S Aguilar, Jessica Nicole Ahlen, Steven Brooks, David Claybaugh, Todd de la Macorra, Axel Ferraro, Simone Forero-Romero, Jaime E Gaztañaga, Enrique Gontcho, Satya Gontcho A Gutierrez, Gaston Guy, Julien https://orcid.org/0000-0001-9822-6793 Honscheid, Klaus Juneau, Stephanie Kirkby, David https://orcid.org/0000-0002-8828-5463 Krolewski, Alex Lambert, Andrew Landriau, Martin Levi, Michael Meisner, Aaron Miquel, Ramon Moustakas, John Muñoz-Gutiérrez, Andrea Myers, Adam Niz, Gustavo Palanque-Delabrouille, Nathalie Percival, Will Prada, Francisco Rossi, Graziano Sanchez, Eusebio Schlafly, Edward https://orcid.org/0000-0002-3569-7421 Schlegel, David Schubnell, Michael Sprayberry, David Tarlé, Gregory Weaver, Benjamin Alan Zou, Hu https://escholarship.org/uc/item/978149tj The first year of data from the Dark Energy Spectroscopic Instrument (DESI) contains the largest set of Lyman-α (Lyα) forest spectra ever observed. This data, collected in the DESI Data Release 1 (DR1) sample, has been used to measure the Baryon Acoustic Oscillation (BAO) feature at redshift z = 2.33. In this work, we use a set of 150 synthetic realizations of DESI DR1 to validate the DESI 2024 Lyα forest BAO measurement presented in [1]. The synthetic data sets are based on Gaussian random fields using the log-normal approximation. We produce realistic synthetic DESI spectra that include all major contaminants affecting the Lyα forest. The synthetic data sets span a redshift range 1.8 < z < 3.8, and are analysed using the same framework and pipeline used for the DESI 2024 Lyα forest BAO measurement. To measure BAO, we use both the Lyα auto-correlation and its cross-correlation with quasar positions. We use the mean of correlation functions from the set of DESI DR1 realizations... https://escholarship.org/uc/item/978149tj Thu, 17 Jul 2025 00:00:00 +0000 Cuceu, Andrei https://orcid.org/0000-0002-2169-0595 Herrera-Alcantar, Hiram K Gordon, Calum Martini, Paul Guy, Julien https://orcid.org/0000-0001-9822-6793 Font-Ribera, Andreu Gonzalez-Morales, Alma X Karim, M Abdul Aguilar, J Ahlen, S Armengaud, E Bault, A Brooks, D Claybaugh, T de la Macorra, A Doel, P Fanning, K Ferraro, S https://orcid.org/0000-0003-4992-7854 Forero-Romero, JE Gaztañaga, E Gontcho, S Gontcho A Gutierrez, G Honscheid, K Howlett, C Karaçaylı, NG Kirkby, D https://orcid.org/0000-0002-8828-5463 Kremin, A https://orcid.org/0000-0001-6356-7424 Landriau, M https://orcid.org/0000-0003-1838-8528 Le Goff, JM Le Guillou, L Levi, ME https://orcid.org/0000-0003-1887-1018 Manera, M Meisner, A Miquel, R Moustakas, J Muñoz-Gutiérrez, A Myers, AD Niz, G Palanque-Delabrouille, N Percival, WJ Poppett, C Prada, F Pérez-Ràfols, I Ramírez-Pérez, C Ravoux, C Rezaie, M Rossi, G Sanchez, E Schlegel, D Schubnell, M Seo, H Sprayberry, D Tan, T Tarlé, G Vargas-Magaña, M Walther, M Weaver, BA Zhou, R https://orcid.org/0000-0001-5381-4372 Zou, H https://escholarship.org/uc/item/3068f1p0 In this paper, we investigate the possibility of selecting high-redshift Lyman-Break Galaxies (LBG) using current and future broadband wide photometric surveys, such as the Ultraviolet Near Infrared Optical Northern Survey (UNIONS) or the Vera C. Rubin Legacy Survey of Space and Time (LSST), using a Random Forest algorithm. This work is conducted in the context of future large-scale structure spectroscopic surveys like DESI-II, the next phase of the Dark Energy Spectroscopic Instrument (DESI), which will start around 2029. We use deep imaging data from the Hyper Suprime Camera (HSC) and the Canada-France-Hawaii Telescope Large Area U-band Deep Survey (CLAUDS) on the COSMOS and XMM-LSS fields. To predict the selection performance of LBGs with image quality similar to UNIONS, we degrade the u,g,r,i and z bands to UNIONS depth. The Random Forest algorithm is trained with the u,g,r,i and z bands to classify LBGs in the 2.5 < z < 3.5 range. We find that fixing a target density... https://escholarship.org/uc/item/3068f1p0 Thu, 17 Jul 2025 00:00:00 +0000 Payerne, Constantin Doumerg, William d'Assignies Yèche, Christophe Ruhlmann-Kleider, Vanina Raichoor, Anand https://orcid.org/0000-0001-5999-7923 Lang, Dusting Aguilar, Jessica Nicole Ahlen, Steven Arnouts, Stéphane Bianchi, Davide Brooks, David Claybaugh, Todd Cole, Shaun de la Macorra, Axel Dey, Arjun Dey, Biprateep Doel, Peter Font-Ribera, Andreu Forero-Romero, Jaime E Gontcho, Satya Gontcho A Gutierrez, Gaston Gwyn, Stephen Honscheid, Klaus Juneau, Stephanie Lambert, Andrew https://orcid.org/0009-0003-5658-2601 Landriau, Martin https://orcid.org/0000-0003-1838-8528 Le Guillou, Laurent Levi, Michael E https://orcid.org/0000-0003-1887-1018 Magneville, Christophe Manera, Marc Meisner, Aaron Miquel, Ramon Moustakas, John Newman, Jeffrey A Palanque-Delabrouille, Nathalie Percival, Will Picouet, Vincent Prada, Francisco Pérez-Ràfols, Ignasi Rossi, Graziano Sanchez, Eusebio Sawicki, Marcin Schlegel, David https://orcid.org/0000-0002-5042-5088 Schubnell, Michael Sprayberry, David Tarlé, Gregory Weaver, Benjamin A Zou, Hu https://escholarship.org/uc/item/2kz3s03g The estimation of uncertainties in cosmological parameters is an important challenge in Large-Scale-Structure (LSS) analyses. For standard analyses such as Baryon Acoustic Oscillations (BAO) and Full-Shape two approaches are usually considered. First: analytical estimates of the covariance matrix use Gaussian approximations and (nonlinear) clustering measurements to estimate the matrix, which allows a relatively fast and computationally cheap way to generate matrices that adapt to an arbitrary clustering measurement. On the other hand, sample covariances are an empirical estimate of the matrix based on an ensemble of clustering measurements from fast and approximate simulations. While more computationally expensive due to the large amount of simulations and volume required, these allow us to take into account systematics that are impossible to model analytically. In this work we compare these two approaches in order to enable DESI's key analyses. We find that the configuration... https://escholarship.org/uc/item/2kz3s03g Thu, 17 Jul 2025 00:00:00 +0000 Forero-Sánchez, D Rashkovetskyi, M Alves, O de Mattia, A Padmanabhan, N Seo, H Nadathur, S Ross, AJ Gil-Marín, H Zarrouk, P Yu, J Ding, Z Andrade, U Chen, X Garcia-Quintero, C Mena-Fernández, J Ahlen, S Bianchi, D Brooks, D Burtin, E Chaussidon, E Claybaugh, T Cole, S de la Macorra, A Enriquez-Vargas, M Gaztañaga, E Gutierrez, G Honscheid, K Howlett, C Kisner, T Landriau, M https://orcid.org/0000-0003-1838-8528 Le Guillou, L Levi, ME https://orcid.org/0000-0003-1887-1018 Miquel, R Moustakas, J Palanque-Delabrouille, N Percival, WJ Pérez-Ràfols, I Rossi, G Sanchez, E Schlegel, D Schubnell, M Sprayberry, D Tarlé, G Vargas-Magaña, M Weaver, BA Zou, H https://escholarship.org/uc/item/13045467 In the era of precision cosmology, ensuring the integrity of data analysis through blinding techniques is paramount — a challenge particularly relevant for the Dark Energy Spectroscopic Instrument (DESI). DESI represents a monumental effort to map the cosmic web, with the goal to measure the redshifts of tens of millions of galaxies and quasars. Given the data volume and the impact of the findings, the potential for confirmation bias poses a significant challenge. To address this, we implement and validate a comprehensive blind analysis strategy for DESI Data Release 1 (DR1), tailored to the specific observables DESI is most sensitive to: Baryonic Acoustic Oscillations (BAO), Redshift-Space Distortion (RSD) and primordial non-Gaussianities (PNG). We carry out the blinding at the catalog level, implementing shifts in the redshifts of the observed galaxies to blind for BAO and RSD signals and weights to blind for PNG through a scale-dependent bias. We validate the blinding technique... https://escholarship.org/uc/item/13045467 Thu, 17 Jul 2025 00:00:00 +0000 Andrade, U Mena-Fernández, J Awan, H Ross, AJ Brieden, S Pan, J de Mattia, A Aguilar, J Ahlen, S Alves, O Brooks, D Buckley-Geer, E Chaussidon, E Claybaugh, T Cole, S de la Macorra, A Dey, A Doel, P Fanning, K Forero-Romero, JE Gaztañaga, E Gil-Marín, H Gontcho, S Gontcho A Guy, J https://orcid.org/0000-0001-9822-6793 Hahn, C Hanif, MMS Honscheid, K Howlett, C Huterer, D Juneau, S Kremin, A https://orcid.org/0000-0001-6356-7424 Landriau, M https://orcid.org/0000-0003-1838-8528 Le Guillou, L Levi, ME https://orcid.org/0000-0003-1887-1018 Manera, M Martini, P Meisner, A Miquel, R Moustakas, J Mueller, E Muñoz-Gutiérrez, A Myers, AD Nadathur, S Newman, JA Nie, J Niz, G Paillas, E Palanque-Delabrouille, N Percival, WJ Pinon, M Poppett, C Prada, F Pérez-Fernández, A Rashkovetskyi, M Rezaie, M Rossi, G Sanchez, E Schlegel, D Schubnell, M Seo, H Sprayberry, D Tarlé, G Vargas-Magaña, M Verde, L Weaver, BA https://escholarship.org/uc/item/0z89g4qv When measuring the Baryon Acoustic Oscillations (BAO) scale from galaxy surveys, one typically assumes a fiducial cosmology when converting redshift measurements into comoving distances and also when defining input parameters for the reconstruction algorithm. A parameterised template for the model to be fitted is also created based on a (possibly different) fiducial cosmology. This model reliance can be considered a form of data compression, and the data is then analysed allowing that the true answer is different from the fiducial cosmology assumed. In this study, we evaluate the impact of the fiducial cosmology assumed in the BAO analysis of the Dark Energy Spectroscopic Instrument (DESI) survey Data Release 1 (DR1) on the final measurements in DESI 2024 III. We utilise a suite of mock galaxy catalogues with survey realism that mirrors the DESI DR1 tracers: the bright galaxy sample (BGS), the luminous red galaxies (LRG), the emission line galaxies (ELG) and the quasars (QSO),... https://escholarship.org/uc/item/0z89g4qv Thu, 17 Jul 2025 00:00:00 +0000 Pérez-Fernández, A Medina-Varela, L Ruggeri, R Vargas-Magaña, M Seo, H Padmanabhan, N Ishak, M Aguilar, J Ahlen, S Alam, S Alves, O Andrade, U Brieden, S Brooks, D Rosell, A Carnero Chen, X Claybaugh, T Cole, S Dawson, K de la Macorra, A de Mattia, A Dey, Arjun Ding, Z Doel, P Fanning, K Garcia-Quintero, C Gaztañaga, E Gontcho, S Gontcho A Gutierrez, G Honscheid, K Juneau, S Kirkby, D https://orcid.org/0000-0002-8828-5463 Kisner, T Lambert, A Landriau, M https://orcid.org/0000-0003-1838-8528 Lasker, J Le Guillou, L Manera, M Martini, P Meisner, A Mena-Fernández, J Miquel, R Moustakas, J Myers, AD Nadathur, S Newman, JA Niz, G Paillas, E Palanque-Delabrouille, N Percival, WJ Poppett, C Prada, F Rashkovetskyi, M Rocher, A Rossi, G Sanchez, A Sanchez, E Schubnell, M Sprayberry, D Tarlé, G Valcin, D https://orcid.org/0000-0003-0129-0620 Weaver, BA Yu, J Zou, H https://escholarship.org/uc/item/0887f7qc The Dark Energy Spectroscopic Instrument (DESI) cosmology survey includes a Bright Galaxy Survey (BGS), which will yield spectra for over 10 million bright galaxies (r < 20.2 AB mag). The resulting sample will be valuable for both cosmological and astrophysical studies. However, the star/galaxy separation criterion implemented in the nominal BGS target selection algorithm excludes quasar host galaxies in addition to bona fide stars. While this excluded population is comparatively rare (∼3–4 per square degrees), it may hold interesting clues regarding galaxy and quasar physics. Therefore, we present a target selection strategy that was implemented to recover these missing active galactic nuclei (AGN) from the BGS sample. The design of the selection criteria was both motivated and confirmed using spectroscopy. The resulting BGS-AGN sample is uniformly distributed over the entire DESI footprint. According to DESI survey validation data, the sample comprises 93% quasi-stellar objects... https://escholarship.org/uc/item/0887f7qc Thu, 17 Jul 2025 00:00:00 +0000 Juneau, S Canning, R Alexander, DM Pucha, R Fawcett, VA Myers, AD Moustakas, J Ruiz-Macias, O Cole, S Pan, Z Aguilar, J Ahlen, S Alam, S Bailey, S https://orcid.org/0000-0003-4162-6619 Brooks, D Chaussidon, E Circosta, C Claybaugh, T Davis, TM Dawson, K de la Macorra, A Dey, Arjun Doel, P Fanning, K Forero-Romero, JE Gaztañaga, E Gontcho, S Gontcho A Gutierrez, G Hahn, C Honscheid, K Kehoe, R Kisner, T Kremin, A https://orcid.org/0000-0001-6356-7424 Lambert, A Landriau, M https://orcid.org/0000-0003-1838-8528 Le Guillou, L Manera, M Martini, P Meisner, A Miquel, R Muñoz-Gutiérrez, A Nie, J Palanque-Delabrouille, N Percival, WJ Poppett, C Prada, F Ravoux, C Rezaie, M Rossi, G Sanchez, E Schlafly, EF https://orcid.org/0000-0002-3569-7421 Schlegel, D Schubnell, M Seo, H Silber, J https://orcid.org/0000-0002-3461-0320 Siudek, M Sprayberry, D Tan, T Tarlé, G Yèche, C Zhou, Z Zou, H https://escholarship.org/uc/item/6dn8z4sg We infer the growth of large scale structure over the redshift range 0.4 ≲ z ≲ 1 from the cross-correlation of spectroscopically calibrated Luminous Red Galaxies (LRGs) selected from the Dark Energy Spectroscopic Instrument (DESI) legacy imaging survey with CMB lensing maps reconstructed from the latest Planck and ACT data. We adopt a hybrid effective field theory (HEFT) model that robustly regulates the cosmological information obtainable from smaller scales, such that our cosmological constraints are reliably derived from the (predominantly) linear regime. We perform an extensive set of bandpower- and parameter-level systematics checks to ensure the robustness of our results and to characterize the uniformity of the LRG sample. We demonstrate that our results are stable to a wide range of modeling assumptions, finding excellent agreement with a linear theory analysis performed on a restricted range of scales. From a tomographic analysis of the four LRG photometric redshift bins... https://escholarship.org/uc/item/6dn8z4sg Tue, 15 Jul 2025 00:00:00 +0000 Sailer, Noah Kim, Joshua Ferraro, Simone https://orcid.org/0000-0003-4992-7854 Madhavacheril, Mathew S White, Martin https://orcid.org/0000-0001-9912-5070 Abril-Cabezas, Irene Aguilar, Jessica Nicole Ahlen, Steven Bond, J Richard Brooks, David Burtin, Etienne Calabrese, Erminia Chen, Shi-Fan Choi, Steve K https://orcid.org/0000-0002-9113-7058 Claybaugh, Todd Dawson, Kyle de la Macorra, Axel DeRose, Joseph Dey, Arjun Dey, Biprateep Doel, Peter Dunkley, Jo Embil-Villagra, Carmen Farren, Gerrit S https://orcid.org/0000-0001-5704-1127 Font-Ribera, Andreu Forero-Romero, Jaime E Gaztañaga, Enrique Gluscevic, Vera Gontcho, Satya Gontcho A Honscheid, Klaus Howlett, Cullan Juneau, Stephanie Kirkby, David https://orcid.org/0000-0002-8828-5463 Kisner, Theodore Kremin, Anthony https://orcid.org/0000-0001-6356-7424 Landriau, Martin https://orcid.org/0000-0003-1838-8528 Le Guillou, Laurent Levi, Michael https://orcid.org/0000-0003-1887-1018 Manera, Marc Meisner, Aaron Miquel, Ramon Moodley, Kavilan Moustakas, John Niemack, Michael D Niz, Gustavo Palanque-Delabrouille, Nathalie Percival, Will Prada, Francisco Qu, Frank J Rossi, Graziano Sanchez, Eusebio Schaan, Emmanuel Schlafly, Edward https://orcid.org/0000-0002-3569-7421 Schlegel, David Schubnell, Michael Sehgal, Neelima Seo, Hee-Jong Sherwin, Blake Sifón, Cristóbal Sprayberry, David Staggs, Suzanne T Tarlé, Gregory Weaver, Benjamin Alan Yèche, Christophe Zhou, Rongpu https://orcid.org/0000-0001-5381-4372 Zou, Hu https://escholarship.org/uc/item/67f7s5bk Abstract: We present the samples of galaxies and quasars used for DESI 2024 cosmological analyses, drawn from the DESI Data Release 1 (DR1). We describe the construction of large-scale structure (LSS) catalogs from these samples, which include matched sets of synthetic reference `randoms' and weights that account for variations in the observed density of the samples due to experimental design and varying instrument performance. We detail how we correct for variations in observational completeness, the input `target' densities due to imaging systematics, and the ability to confidently measure redshifts from DESI spectra. We then summarize how remaining uncertainties in the corrections can be translated to systematic uncertainties for particular analyses. We describe the weights added to maximize the signal-to-noise of DESI DR1 2-point clustering measurements. We detail measurement pipelines applied to the LSS catalogs that obtain 2-point clustering measurements... https://escholarship.org/uc/item/67f7s5bk Tue, 15 Jul 2025 00:00:00 +0000 Adame, AG Aguilar, J Ahlen, S Alam, S Alexander, DM Alvarez, M Alves, O Anand, A https://orcid.org/0000-0003-2923-1585 Andrade, U Armengaud, E Avila, S Aviles, A Awan, H Bailey, S https://orcid.org/0000-0003-4162-6619 Baltay, C Bault, A Behera, J BenZvi, S Beutler, F Bianchi, D Blake, C Blum, R Brieden, S Brodzeller, A https://orcid.org/0000-0002-8934-0954 Brooks, D Brown, Z Buckley-Geer, E Burtin, E Calderon, R Canning, R Rosell, A Carnero Cereskaite, R Cervantes-Cota, JL Chabanier, S Chaussidon, E Chaves-Montero, J Chen, S Chen, X Claybaugh, T Cole, S Cuceu, A https://orcid.org/0000-0002-2169-0595 Davis, TM Dawson, K de la Macorra, A de Mattia, A Deiosso, N Demina, R Dey, A Dey, B Ding, Z Doel, P Edelstein, J Eftekharzadeh, S Eisenstein, DJ Elliott, A Fagrelius, P Fanning, K Ferraro, S https://orcid.org/0000-0003-4992-7854 Ereza, J Findlay, N Flaugher, B Font-Ribera, A Forero-Sánchez, D Forero-Romero, JE Frenk, CS Garcia-Quintero, C Gaztañaga, E Gil-Marín, H Gontcho, S Gontcho A Gonzalez-Morales, AX Gonzalez-Perez, V Gordon, C Green, D Gruen, D Gsponer, R Gutierrez, G Guy, J https://orcid.org/0000-0001-9822-6793 Hadzhiyska, B Hahn, C Hanif, MMS Herrera-Alcantar, HK Honscheid, K Hou, J Howlett, C Huterer, D Iršič, V Ishak, M Juneau, S Karaçaylı, NG Kehoe, R Kent, S Kirkby, D https://orcid.org/0000-0002-8828-5463 Kitaura, F-S Kong, H Kremin, A https://orcid.org/0000-0001-6356-7424 Krolewski, A Lai, Y Lan, T-W Landriau, M https://orcid.org/0000-0003-1838-8528 Lang, D https://escholarship.org/uc/item/1rj09426 We present the Lyssa suite of high-resolution cosmological simulations of the Lyman-α forest designed for cosmological analyses. These 18 simulations have been run using the Nyx code with 40963 hydrodynamical cells in a 120 Mpc (∼ 81 Mpc/h) comoving box and individually provide sub-percent level convergence of the Lyman-α forest 1d flux power spectrum. We build a Gaussian process emulator for the Lyssa simulations in the lym1d likelihood framework to interpolate the power spectrum at arbitrary parameter values. We validate this emulator based on leave-one-out tests and based on the parameter constraints for simulations outside of the training set. We also perform comparisons with a previous emulator, showing a percent level accuracy and a good recovery of the expected cosmological parameters. Using this emulator we derive constraints on the linear matter power spectrum amplitude and slope parameters A Lyα and n Lyα . While the best-fit Planck ΛCDM model has A Lyα = 8.79 and n... https://escholarship.org/uc/item/1rj09426 Tue, 15 Jul 2025 00:00:00 +0000 Walther, Michael Schöneberg, Nils Chabanier, Solène Armengaud, Eric Sexton, Jean https://orcid.org/0000-0003-2551-1678 Yèche, Christophe Lesgourgues, Julien Mosbech, Markus R Ravoux, Corentin Palanque-Delabrouille, Nathalie Lukić, Zarija https://escholarship.org/uc/item/1qx8n794 Aims. We use the angular cross-correlation between a luminous red galaxy (LRG) sample from the Dark Energy Spectroscopic Instrument (DESI) Legacy Survey data release DR9 and the Planck cosmic microwave background (CMB) lensing maps to constrain the local primordial non-Gaussianity parameter, f NL , using the scale-dependent galaxy bias effect. The galaxy sample covers approximately 40% of the sky, contains galaxies up to redshift z ∼ 1.4, and is calibrated with the LRG spectra that have been observed for DESI Year 1 (Y1). Methods. We apply a nonlinear imaging systematics treatment based on neural networks to remove observational effects that could potentially bias the f NL measurement. Our measurement is performed without blinding, but the full analysis pipeline is tested with simulations including systematics. Results. Using the two-point angular cross-correlation between LRG and CMB lensing only, we find f NL = 39 −38 +40 at the 68% confidence level, and our result is robust... https://escholarship.org/uc/item/1qx8n794 Fri, 11 Jul 2025 00:00:00 +0000 Bermejo-Climent, JR Demina, R Krolewski, A Chaussidon, E Rezaie, M Ahlen, S Bailey, S https://orcid.org/0000-0003-4162-6619 Bianchi, D Brooks, D Burtin, E Claybaugh, T de la Macorra, A Dey, A Doel, P Farren, G https://orcid.org/0000-0001-5704-1127 Ferraro, S Forero-Romero, JE Gaztañaga, E Gontcho, S Gontcho A Gutierrez, G Hahn, C Honscheid, K Howlett, C Kehoe, R Kirkby, D https://orcid.org/0000-0002-8828-5463 Kisner, T Landriau, M Le Guillou, L Levi, ME https://orcid.org/0000-0003-1887-1018 Manera, M Meisner, A Miquel, R Moustakas, J Newman, JA Niz, G Palanque-Delabrouille, N Percival, WJ Prada, F Pérez-Ràfols, I Rabinowitz, D Ross, AJ Rossi, G Sanchez, E Schlegel, D Sprayberry, D Tarlé, G Weaver, BA White, M https://orcid.org/0000-0001-9912-5070 Yèche, C Zarrouk, P https://escholarship.org/uc/item/8k53z0rn The large scale structure catalogs within DESI Data Release 1 (DR1) use nearly 6 million galaxies and quasars as tracers of the large-scale structure of the universe to measure the expansion history with baryon acoustic oscillations and the growth of structure with redshift-space distortions. In order to take advantage of DESI's unprecedented statistical power, we must ensure that the galaxy clustering measurements are unaffected by non-cosmological density fluctuations. One source of spurious fluctuations comes from variation in galaxy density with spectroscopic observing conditions, lowering the redshift efficiency (and thus galaxy density) in certain areas of the sky. We measure the uniformity of the redshift success rate for DESI luminous red galaxies (LRG), bright galaxies (BGS) and quasars (QSO), complementing the detailed discussion of emission line galaxy (ELG) systematics in a companion paper [1]. We find small but significant fluctuations of up to 3% in redshift success... https://escholarship.org/uc/item/8k53z0rn Tue, 24 Jun 2025 00:00:00 +0000 Krolewski, A Yu, J Ross, AJ Penmetsa, S Percival, WJ Zhou, R https://orcid.org/0000-0001-5381-4372 Wilson, MJ Hou, J Aguilar, J Ahlen, S Brooks, D Chaussidon, E Claybaugh, T de la Macorra, A Dey, Biprateep Forero-Romero, JE Gontcho, S Gontcho A Guy, J https://orcid.org/0000-0001-9822-6793 Honscheid, K Juneau, S Kirkby, D https://orcid.org/0000-0002-8828-5463 Kisner, T Kremin, A https://orcid.org/0000-0001-6356-7424 Lambert, A Le Guillou, L Levi, ME https://orcid.org/0000-0003-1887-1018 Martini, P Meisner, A Miquel, R Moustakas, J Myers, AD Newman, JA Niz, G Palanque-Delabrouille, N Rossi, G Sanchez, E Schlafly, EF https://orcid.org/0000-0002-3569-7421 Schlegel, D Schubnell, M Seo, H Sprayberry, D Tarlé, G Weaver, BA Zhao, C https://escholarship.org/uc/item/1hp6q5pn The series of papers included in this special issue represent the first cosmological measurements from the Dark Energy Spectroscopic Instrument (DESI). These papers present the validation of the DESI clustering catalogs, the methodology for the cosmology measurements, and the full cosmology implications. These measurements were derived from a catalog of approximately 6.4 million extragalactic sources in a redshift range of 0.1 < z < 4.2. Owing to advances in fiber positioner technology and to a larger telescope, this sample was acquired in only one year of observation, yet is more than double the size of the galaxy and quasar samples from the first four phases of the Sloan Digital Sky Survey (SDSS) that spanned 20 years. With these new galaxy and quasar catalogs, the DESI collaboration completed percent-level constraints on the cosmic expansion history and the growth of structure. In turn, these new measurements provided a new platform from which to test the equation of... https://escholarship.org/uc/item/1hp6q5pn Tue, 24 Jun 2025 00:00:00 +0000 Dawson, Kyle Palanque-Delabrouille, Nathalie https://escholarship.org/uc/item/9gt3k403 Modern laser plasma accelerators often require plasma waveguides tens of centimeters long to propagate a high-intensity drive laser pulse. Tapering the longitudinal gas density profile in 10 cm scale gas jets could allow for single stage laser plasma acceleration well beyond 10 GeV with current petawatt-class laser systems. Via simulation and interferometry measurements, we show density control by longitudinally adjusting the throat width and jet angle. Density profiles appropriate for tapering were calculated analytically and via particle-in-cell simulations and were matched experimentally. These simulations show that tapering can increase electron beam energy using 19 J laser energy from ∼9 GeV to >12 GeV in a 30 cm plasma and the accelerated charge by an order of magnitude. https://escholarship.org/uc/item/9gt3k403 Wed, 21 May 2025 00:00:00 +0000 Li, R https://orcid.org/0009-0000-7576-4927 Picksley, A Benedetti, C https://orcid.org/0000-0003-0408-1103 Filippi, F Stackhouse, J Fan-Chiang, L Tsai, HE https://orcid.org/0000-0002-8667-5468 Nakamura, K https://orcid.org/0000-0001-9842-7114 Schroeder, CB https://orcid.org/0000-0002-9610-0166 van Tilborg, J Esarey, E Geddes, CGR Gonsalves, AJ https://orcid.org/0000-0002-2567-7582 https://escholarship.org/uc/item/4qx0p0t4 We present an in-depth analysis of the fiber assignment incompleteness in the Dark Energy Spectroscopic Instrument (DESI) Data Release 1 (DR1). This incompleteness is caused by the restricted mobility of the robotic fiber positioner in the DESI focal plane, which limits the number of galaxies that can be observed at the same time, especially at small angular separations. As a result, the observed clustering amplitude is suppressed in a scale-dependent manner, which, if not addressed, can severely impact the inference of cosmological parameters. We discuss the methods adopted for simulating fiber assignment on mocks and data. In particular, we introduce the fast fiber assignment (FFA) emulator, which was employed to obtain the power spectrum covariance adopted for the DR1 full-shape analysis. We present the mitigation techniques, organised in two classes: measurement stage and model stage. We then use high fidelity mocks as a reference to quantify both the accuracy of the FFA emulator... https://escholarship.org/uc/item/4qx0p0t4 Tue, 20 May 2025 00:00:00 +0000 Bianchi, D Hanif, MMS Rosell, A Carnero Lasker, J Ross, AJ Pinon, M de Mattia, A White, M https://orcid.org/0000-0001-9912-5070 Ahlen, S Bailey, S https://orcid.org/0000-0003-4162-6619 Brooks, D Burtin, E Chaussidon, E Claybaugh, T Cole, S de la Macorra, A Ferraro, S https://orcid.org/0000-0003-4992-7854 Font-Ribera, A Forero-Romero, JE Gaztañaga, E Gontcho, S Gontcho A Gutierrez, G Guy, J https://orcid.org/0000-0001-9822-6793 Hahn, C Honscheid, K Howlett, C Juneau, S Kirkby, D https://orcid.org/0000-0002-8828-5463 Kisner, T Kremin, A https://orcid.org/0000-0001-6356-7424 Landriau, M https://orcid.org/0000-0003-1838-8528 Le Guillou, L Levi, ME https://orcid.org/0000-0003-1887-1018 McDonald, P https://orcid.org/0000-0001-8346-8394 Meisner, A Miquel, R Moustakas, J Palanque-Delabrouille, N Percival, WJ Prada, F Pérez-Ràfols, I Raichoor, A https://orcid.org/0000-0001-5999-7923 Rossi, G Sanchez, E Schlegel, D Schubnell, M Sharples, R Silber, J https://orcid.org/0000-0002-3461-0320 Sprayberry, D Tarlé, G Vargas-Magaña, M Weaver, BA Zarrouk, P Zhou, R https://orcid.org/0000-0001-5381-4372 Zou, H https://escholarship.org/uc/item/4ph5p9s4 This work explores the construction of a fast emulator for the calculation of the final pattern of nucleosynthesis in the rapid neutron capture process (the r-process). An emulator is built using a feed-forward artificial neural network (ANN). We train the ANN with nuclear data and relative abundance patterns. We take as input the β-decay half-lives and the one-neutron separation energy of the nuclei in the rare-earth region. The output is the final isotopic abundance pattern. In this work, we focus on the nuclear data and abundance patterns in the rare-earth region to reduce the dimension of the input and output space. We show that the ANN can capture the effect of the changes in the nuclear physics inputs on the final r-process abundance pattern in the adopted astrophysical conditions. We employ the deep ensemble method to quantify the prediction uncertainty of the neural network emulator. The emulator achieves a speed-up by a factor of about 20 000 in obtaining a final abundance... https://escholarship.org/uc/item/4ph5p9s4 Tue, 20 May 2025 00:00:00 +0000 Saito, Yukiya Dillmann, Iris Krücken, Reiner Mumpower, Matthew R Surman, Rebecca https://escholarship.org/uc/item/6fc35504 Dark Energy Spectroscopic Instrument (DESI) uses more than 2.4 million Emission Line Galaxies (ELGs) for 3D large-scale structure (LSS) analyses in its Data Release 1 (DR1). Such large statistics enable thorough research on systematic uncertainties. In this study, we focus on spectroscopic systematics of ELGs. The redshift success rate (f goodz) is the relative fraction of secure redshifts among all measurements. It depends on observing conditions, thus introduces non-cosmological variations to the LSS. We, therefore, develop the redshift failure weight (w zfail) and a per-fibre correction (η zfail) to mitigate these dependences. They have minor influences on the galaxy clustering. For ELGs with a secure redshift, there are two subtypes of systematics: 1) catastrophics (large) that only occur in a few samples; 2) redshift uncertainty (small) that exists for all samples. The catastrophics represent 0.26% of the total DR1 ELGs, composed of the confusion between [O ii] and sky residuals,... https://escholarship.org/uc/item/6fc35504 Wed, 14 May 2025 00:00:00 +0000 Yu, J Ross, AJ Rocher, A Alves, O de Mattia, A Forero-Sánchez, D Kneib, J Krolewski, A Lan, T-W Rashkovetskyi, M Aguilar, J Ahlen, S Bailey, S https://orcid.org/0000-0003-4162-6619 Brooks, D Chaussidon, E Claybaugh, T de la Macorra, A Dey, Arjun Dey, Biprateep Doel, P Fanning, K Forero-Romero, JE Gaztañaga, E Gontcho, S Gontcho A Honscheid, K Howlett, C Juneau, S Kisner, T Kremin, A https://orcid.org/0000-0001-6356-7424 Lambert, A Landriau, M https://orcid.org/0000-0003-1838-8528 Le Guillou, L Levi, ME https://orcid.org/0000-0003-1887-1018 Manera, M Martini, P Meisner, A Miquel, R Moustakas, J Mueller, E Muñoz-Gutiérrez, A Myers, AD Nie, J Niz, G Palanque-Delabrouille, N Percival, WJ Poppett, C Prada, F Rezaie, M Rossi, G Sanchez, E Schlafly, EF https://orcid.org/0000-0002-3569-7421 Schlegel, D Schubnell, M Seo, H Sprayberry, D Tarlé, G Weaver, BA Zarrouk, P Zhao, C Zhou, R https://orcid.org/0000-0001-5381-4372 Zou, H https://escholarship.org/uc/item/1946q35d Baryon acoustic oscillation data from the first year of the Dark Energy Spectroscopic Instrument (DESI) provide near percent-level precision of cosmic distances in seven bins over the redshift range z=0.1–4.2. This paper is the follow-up to the original DESI BAO cosmology paper [A. G. Adame (DESI Collaboration), arXiv:2404.03002], which considered the conventional w0wa cold dark matter (CDM) model. We use the novel DESI data, together with other cosmic probes, to constrain the background expansion history using some well-motivated physical classes of dark energy. In particular, we explore three physics-focused behaviors of dark energy from the equation of state and energy density perspectives: the thawing class (matching many simple quintessence potentials), emergent class (where dark energy comes into being recently, as in phase transition models), and mirage class [where phenomenologically the distance to cosmic microwave background (CMB) last scattering is close to that from... https://escholarship.org/uc/item/1946q35d Wed, 14 May 2025 00:00:00 +0000 Lodha, K Shafieloo, A Calderon, R Linder, E Sohn, W Cervantes-Cota, JL de Mattia, A García-Bellido, J Ishak, M Matthewson, W Aguilar, J Ahlen, S Brooks, D Claybaugh, T de la Macorra, A Dey, A Dey, B Doel, P Forero-Romero, JE Gaztañaga, E Gontcho, S Gontcho A Howlett, C Juneau, S Kent, S Kisner, T Lambert, A Landriau, M https://orcid.org/0000-0003-1838-8528 Le Guillou, L Martini, P Meisner, A Miquel, R Moustakas, J Newman, JA Niz, G Palanque-Delabrouille, N Percival, WJ Poppett, C Prada, F Rossi, G Ruhlmann-Kleider, V Sanchez, E Schlafly, EF https://orcid.org/0000-0002-3569-7421 Schlegel, D Schubnell, M Seo, H Sprayberry, D Tarlé, G Weaver, BA Zou, H https://escholarship.org/uc/item/9gm8j3mb We present the technical details on how large-scale structure (LSS) catalogs are constructed from redshifts measured from spectra observed by the Dark Energy Spectroscopic Instrument (DESI). The LSS catalogs provide the information needed to determine the relative number density of DESI tracers as a function of redshift and celestial coordinates and, e.g., determine clustering statistics. We produce catalogs that are weighted subsamples of the observed data, each matched to a weighted `random' catalog that forms an unclustered sampling of the probability density that DESI could have observed those data at each location. Precise knowledge of the DESI observing history and associated hardware performance allows for a determination of the DESI footprint and the number of times DESI has covered it at sub-arcsecond level precision. This enables the completeness of any DESI sample to be modeled at this same resolution. The pipeline developed to create LSS catalogs has been designed... https://escholarship.org/uc/item/9gm8j3mb Tue, 29 Apr 2025 00:00:00 +0000 Ross, AJ Aguilar, J Ahlen, S Alam, S Anand, A https://orcid.org/0000-0003-2923-1585 Bailey, S https://orcid.org/0000-0003-4162-6619 Bianchi, D Brieden, S Brooks, D Burtin, E Rosell, A Carnero Chaussidon, E Claybaugh, T Cole, S Dawson, K de la Macorra, A de Mattia, A Dey, A Dey, B Doel, P Fanning, K Ferraro, S https://orcid.org/0000-0003-4992-7854 Ereza, J Font-Ribera, A Forero-Romero, JE Gaztañaga, E Gil-Marín, H Gontcho, S Gontcho A Gonzalez-Morales, AX Guy, J https://orcid.org/0000-0001-9822-6793 Hahn, C Heydenreich, S Honscheid, K Howlett, C Ishak, M Karim, T Kirkby, D https://orcid.org/0000-0002-8828-5463 Kisner, T Kong, H Kremin, A https://orcid.org/0000-0001-6356-7424 Krolewski, A Lambert, A Landriau, M https://orcid.org/0000-0003-1838-8528 Lasker, J Guillou, LL Levi, ME https://orcid.org/0000-0003-1887-1018 Manera, M Martini, P McDonald, P https://orcid.org/0000-0001-8346-8394 Meisner, A Miquel, R Moon, J Moustakas, J Muñoz-Gutiérrez, A Myers, AD Nadathur, S Napolitano, L Newman, JA Nie, J Niz, G Palanque-Delabrouille, N Percival, WJ Poppett, C Prada, F Raichoor, A https://orcid.org/0000-0001-5999-7923 Ravoux, C Rezaie, M Rosado-Marin, A Rossi, G Samushia, L Sanchez, E Schlafly, EF https://orcid.org/0000-0002-3569-7421 Schlegel, D Seo, H Smith, A Sprayberry, D Tarlé, G Valcin, D https://orcid.org/0000-0003-0129-0620 Vargas-Magaña, M Weaver, BA Wilson, MJ Yu, J Zarrouk, P Zhao, C Zhou, R https://orcid.org/0000-0001-5381-4372 Zou, H https://escholarship.org/uc/item/746597bw The Dark Energy Spectroscopic Instrument (DESI) will provide unprecedented information about the large-scale structure of our Universe. In this work, we study the robustness of the theoretical modelling of the power spectrum of Folps, a novel effective field theory-based package for evaluating the redshift space power spectrum in the presence of massive neutrinos. We perform this validation by fitting the AbacusSummit high-accuracy N-body simulations for Luminous Red Galaxies, Emission Line Galaxies and Quasar tracers, calibrated to describe DESI observations. We quantify the potential systematic error budget of Folps finding that the modelling errors are fully sub-dominant for the DESI statistical precision within the studied range of scales. Additionally, we study two complementary approaches to fit and analyse the power spectrum data, one based on direct Full-Modelling fits and the other on the ShapeFit compression variables, both resulting in very good agreement in precision... https://escholarship.org/uc/item/746597bw Tue, 29 Apr 2025 00:00:00 +0000 Noriega, HE Aviles, A Gil-Marín, H Ramirez-Solano, S Fromenteau, S Vargas-Magaña, M Aguilar, J Ahlen, S Alves, O Brieden, S Brooks, D Cervantes-Cota, JL Chen, S Claybaugh, T Cole, S Dawson, K de la Macorra, A de Mattia, A Doel, P Findlay, N Forero-Romero, JE Gaztañaga, E Gontcho, S Gontcho A Honscheid, K Hou, J Howlett, C Ishak, M Juneau, S Lai, Y Landriau, M https://orcid.org/0000-0003-1838-8528 Manera, M Maus, M Miquel, R Morales-Navarrete, G Mueller, E Muñoz-Gutiérrez, A Myers, AD Nadathur, S Niz, G Palanque-Delabrouille, N Percival, WJ Poppett, C Rezaie, M Rocher, A Rossi, G Sanchez, E Schlegel, D Schubnell, M Sprayberry, D Tarlé, G Verde, L Yuan, S Zarrouk, P Zou, H https://escholarship.org/uc/item/5f17p68c Baryon acoustic oscillations (BAO) provide a robust standard ruler to measure the expansion history of the Universe through galaxy clustering. Density-field reconstruction is now a widely adopted procedure for increasing the precision and accuracy of the BAO detection. With the goal of finding the optimal reconstruction settings to be used in the DESI 2024 galaxy BAO analysis, we assess the sensitivity of the post-reconstruction BAO constraints to different choices in our analysis configuration, performing tests on blinded data from the first year of DESI observations (DR1), as well as on mocks that mimic the expected clustering and selection properties of the DESI DR1 target samples. Overall, we find that BAO constraints remain robust against multiple aspects in the reconstruction process, including the choice of smoothing scale, treatment of redshift-space distortions, fiber assignment incompleteness, and parameterizations of the BAO model. We also present a series of tests... https://escholarship.org/uc/item/5f17p68c Tue, 29 Apr 2025 00:00:00 +0000 Paillas, E Ding, Z Chen, X Seo, H Padmanabhan, N de Mattia, A Ross, AJ Nadathur, S Howlett, C Aguilar, J Ahlen, S Alves, O Andrade, U Brooks, D Buckley-Geer, E Burtin, E Chen, S Claybaugh, T Cole, S Dawson, K de la Macorra, A Dey, Arjun Doel, P Fanning, K Ferraro, S https://orcid.org/0000-0003-4992-7854 Forero-Romero, JE Garcia-Quintero, C Gaztañaga, E Gil-Marín, H Gontcho, S Gontcho A Gutierrez, G Hahn, C Hanif, MMS Honscheid, K Ishak, M Kehoe, R Kremin, A https://orcid.org/0000-0001-6356-7424 Landriau, M https://orcid.org/0000-0003-1838-8528 Le Guillou, L Levi, ME https://orcid.org/0000-0003-1887-1018 Manera, M Martini, P Medina-Varela, L Meisner, A Mena-Fernández, J Miquel, R Moustakas, J Mueller, E Muñoz-Gutiérrez, A Myers, AD Newman, JA Nie, J Niz, G Palanque-Delabrouille, N Percival, WJ Poppett, C Prada, F Pérez-Fernández, A Rashkovetskyi, M Rezaie, M Rosado-Marin, A Rossi, G Ruggeri, R Sanchez, E Saulder, C Schlafly, EF https://orcid.org/0000-0002-3569-7421 Schlegel, D Schubnell, M Sprayberry, D Tarlé, G Valcin, D https://orcid.org/0000-0003-0129-0620 Vargas-Magaña, M Yu, J Yuan, S Zhou, R https://orcid.org/0000-0001-5381-4372 Zou, H https://escholarship.org/uc/item/0nm3n5fp The Dark Energy Spectroscopic Instrument (DESI) will provide precise measurements of Baryon Acoustic Oscillations (BAO) to constrain the expansion history of the Universe and set stringent constraints on dark energy. Therefore, precise control of the global error budget due to various systematic effects is required for the DESI 2024 BAO analysis. In this work, we estimate the level of systematics induced in the DESI BAO analysis due the assumed Halo Occupation Distribution (HOD) model for the Emission Line Galaxy (ELG) tracer. We make use of mock galaxy catalogs constructed by fitting various HOD models to early DESI data, namely the One-Percent survey data. Our analysis includes typical HOD models for the ELG tracer used in the literature as well as extensions to the baseline models. Among the extensions, we consider various recipes for galactic conformity and assembly bias. We use 25 AbacusSummit simulations under the ΛCDM cosmology for each HOD model and perform independent... https://escholarship.org/uc/item/0nm3n5fp Tue, 29 Apr 2025 00:00:00 +0000 Garcia-Quintero, C Mena-Fernández, J Rocher, A Yuan, S Hadzhiyska, B Alves, O Rashkovetskyi, M Seo, H Padmanabhan, N Nadathur, S Howlett, C Ishak, M Medina-Varela, L McDonald, P https://orcid.org/0000-0001-8346-8394 Ross, AJ Xie, Y Chen, X Bera, A Aguilar, J Ahlen, S Andrade, U BenZvi, S Brooks, D Burtin, E Chen, S Claybaugh, T Cole, S de la Macorra, A de Mattia, A Dey, A Dey, B Ding, Z Doel, P Fanning, K Forero-Romero, JE Gaztañaga, E Gil-Marín, H Gontcho, S Gontcho A Gutierrez, G Guy, J https://orcid.org/0000-0001-9822-6793 Hahn, C Honscheid, K Kremin, A https://orcid.org/0000-0001-6356-7424 Landriau, M https://orcid.org/0000-0003-1838-8528 Le Guillou, L Levi, ME https://orcid.org/0000-0003-1887-1018 Manera, M Martini, P Meisner, A Miquel, R Moustakas, J Mueller, E Muñoz-Gutiérrez, A Myers, AD Newman, JA Nie, J Niz, G Paillas, E Palanque-Delabrouille, N Percival, WJ Poppett, C Pérez-Fernández, A Rosado-Marin, A Rossi, G Ruggeri, R Sanchez, E Schlegel, D Schubnell, M Sprayberry, D Tarlé, G Vargas-Magaña, M Weaver, BA Yu, J Zhang, H Zhou, R https://orcid.org/0000-0001-5381-4372 Zou, H https://escholarship.org/uc/item/07d801t4 We present the DESI 2024 galaxy and quasar baryon acoustic oscillations (BAO) measurements using over 5.7 million unique galaxy and quasar redshifts in the range 0.1 < z < 2.1. Divided by tracer type, we utilize 300,017 galaxies from the magnitude-limited Bright Galaxy Survey with 0.1 < z < 0.4, 2,138,600 Luminous Red Galaxies with 0.4 < z < 1.1, 2,432,022 Emission Line Galaxies with 0.8 < z < 1.6, and 856,652 quasars with 0.8 < z < 2.1, over a ∼ 7,500 square degree footprint. The analysis was blinded at the catalog-level to avoid confirmation bias. All fiducial choices of the BAO fitting and reconstruction methodology, as well as the size of the systematic errors, were determined on the basis of the tests with mock catalogs and the blinded data catalogs. We present several improvements to the BAO analysis pipeline, including enhancing the BAO fitting and reconstruction methods in a more physically-motivated direction, and also present results using... https://escholarship.org/uc/item/07d801t4 Tue, 22 Apr 2025 00:00:00 +0000 Adame, AG Aguilar, J Ahlen, S Alam, S Alexander, DM Alvarez, M Alves, O Anand, A https://orcid.org/0000-0003-2923-1585 Andrade, U Armengaud, E Avila, S Aviles, A Awan, H Bailey, S https://orcid.org/0000-0003-4162-6619 Baltay, C Bault, A Behera, J BenZvi, S Beutler, F Bianchi, D Blake, C Blum, R Brieden, S Brodzeller, A https://orcid.org/0000-0002-8934-0954 Brooks, D Buckley-Geer, E Burtin, E Calderon, R Canning, R Rosell, A Carnero Cereskaite, R Cervantes-Cota, JL Chabanier, S Chaussidon, E Chaves-Montero, J Chen, S Chen, X Claybaugh, T Cole, S Cuceu, A https://orcid.org/0000-0002-2169-0595 Davis, TM Dawson, K de la Macorra, A de Mattia, A Deiosso, N Dey, A Dey, B Ding, Z Doel, P Edelstein, J Eftekharzadeh, S Eisenstein, DJ Elliott, A Fagrelius, P Fanning, K Ferraro, S https://orcid.org/0000-0003-4992-7854 Ereza, J Findlay, N Flaugher, B Font-Ribera, A Forero-Sánchez, D Forero-Romero, JE Garcia-Quintero, C Gaztañaga, E Gil-Marín, H Gontcho, S Gontcho A Gonzalez-Morales, AX Gonzalez-Perez, V Gordon, C Green, D Gruen, D Gsponer, R Gutierrez, G Guy, J https://orcid.org/0000-0001-9822-6793 Hadzhiyska, B Hahn, C Hanif, MMS Herrera-Alcantar, HK Honscheid, K Howlett, C Huterer, D Iršič, V Ishak, M Juneau, S Karaçaylı, NG Kehoe, R Kent, S Kirkby, D https://orcid.org/0000-0002-8828-5463 Kong, H Kremin, A https://orcid.org/0000-0003-0667-5941 Krolewski, A Lai, Y Lan, T-W Landriau, M https://orcid.org/0000-0003-1838-8528 Lang, D Lasker, J Le Goff, JM Le Guillou, L Leauthaud, A Levi, ME https://orcid.org/0000-0003-1887-1018 https://escholarship.org/uc/item/9xf113n1 At millimeter wavelengths, the atmospheric emission is circularly polarized owing to the Zeeman splitting of molecular oxygen by the Earth's magnetic field. We report a measurement of the signal in the 150 GHz band using 3 yr of observational data with the Polarbear project. Nonidealities of a continuously rotating half-wave plate (HWP) partially convert circularly polarized light to linearly polarized light. While Polarbear detectors are sensitive to linear polarization, this effect makes them sensitive to circular polarization. Although this was not the intended use, we utilized this conversion to measure circular polarization. We reconstruct the azimuthal gradient of the circular polarization signal and measure its dependency from the scanning direction and the detector bandpass. We compare the signal with a simulation based on atmospheric emission theory, the detector bandpass, and the HWP leakage spectrum model. We find the ratio of the observed azimuthal slope to the simulated... https://escholarship.org/uc/item/9xf113n1 Tue, 15 Apr 2025 00:00:00 +0000 Fujino, Takuro Takakura, Satoru Arani, Shahed Shayan Barron, Darcy Baccigalupi, Carlo Chinone, Yuji Errard, Josquin Fabbian, Giulio Feng, Chang Halverson, Nils W Hasegawa, Masaya Hazumi, Masashi Jeong, Oliver Kaneko, Daisuke Keating, Brian Kusaka, Akito Lee, Adrian Matsumura, Tomotake Piccirillo, Lucio Reichardt, Christian L Sakaguri, Kana Siritanasak, Praween Yamada, Kyohei https://escholarship.org/uc/item/0w86d72g Laser-driven (LD) ion acceleration has been explored in a newly constructed short focal length laser beamline at the BELLA petawatt facility (interaction point 2, iP2). For applications utilizing such LD ion beams, a beam transport system is required, which for reasons of compactness be ideally contained within 3 m. While they are generated from a micron-scale source, large divergence and energy spread of LD ion beams present a unique challenge to transporting them compared to beams from conventional accelerators. This study gives an overview of proposed compact transport designs using permanent magnets satisfying different requirements depending on the application for the iP2 laser beamline such as radiation biology, material science, and high-energy density science. These designs are optimized for different parameters such as energy spread and peak proton density according to the application’s need. The various designs consist solely of permanent magnet elements, which... https://escholarship.org/uc/item/0w86d72g Thu, 10 Apr 2025 00:00:00 +0000 De Chant, J Nakamura, K https://orcid.org/0000-0001-9842-7114 Ji, Q Obst-Huebl, L https://orcid.org/0000-0001-9236-8037 Barber, S Snijders, AM Geddes, CGR van Tilborg, J Gonsalves, AJ https://orcid.org/0000-0002-2567-7582 Schroeder, CB https://orcid.org/0000-0002-9610-0166 Esarey, E https://escholarship.org/uc/item/8c65439n We present the first measurements of Lyman-α (Lyα) forest correlations using early data from the Dark Energy Spectroscopic Instrument (DESI). We measure the auto-correlation of Lyα absorption using 88 509 quasars at z > 2, and its cross-correlation with quasars using a further 147 899 tracer quasars at z ≳ 1.77. Then, we fit these correlations using a 13-parameter model based on linear perturbation theory and find that it provides a good description of the data across a broad range of scales. We detect the BAO peak with a signal-to-noise ratio of 3.8σ, and show that our measurements of the auto- and cross-correlations are fully-consistent with previous measurements by the Extended Baryon Oscillation Spectroscopic Survey (eBOSS). Even though we only use here a small fraction of the final DESI dataset, our uncertainties are only a factor of 1.7 larger than those from the final eBOSS measurement. We validate the existing analysis methods of Lyα correlations in preparation for... https://escholarship.org/uc/item/8c65439n Tue, 8 Apr 2025 00:00:00 +0000 Gordon, C Cuceu, A Chaves-Montero, J Font-Ribera, A González-Morales, AX Aguilar, J Ahlen, S Armengaud, E Bailey, S https://orcid.org/0000-0003-4162-6619 Bault, A Brodzeller, A https://orcid.org/0000-0002-8934-0954 Brooks, D Claybaugh, T de la Cruz, R Dawson, K Doel, P Forero-Romero, JE Gontcho, S Gontcho A Guy, J https://orcid.org/0000-0001-9822-6793 Herrera-Alcantar, HK Iršič, V Karaçaylı, NG Kirkby, D https://orcid.org/0000-0002-8828-5463 Landriau, M https://orcid.org/0000-0003-1838-8528 Le Guillou, L Levi, ME de la Macorra, A Manera, M Martini, P Meisner, A Miquel, R Montero-Camacho, P Muñoz-Gutiérrez, A Napolitano, L Nie, J Niz, G Palanque-Delabrouille, N Percival, WJ Pieri, M Poppett, C Prada, F Pérez-Ràfols, I Ramírez-Pérez, C Ravoux, C Rezaie, M Ross, AJ Rossi, G Sanchez, E Schlegel, D Schubnell, M Seo, H Sinigaglia, F Tan, T Tarlé, G Walther, M Weaver, BA Yèche, C Zhou, Z Zou, H https://escholarship.org/uc/item/4dc7x4tz The Dark Energy Spectroscopic Instrument (DESI) will measure millions of quasar spectra by the end of its 5 year survey. Quasar redshift errors impact the shape of the Lyman-α forest correlation functions, which can affect cosmological analyses and therefore cosmological interpretations. Using data from the DESI Early Data Release and the first two months of the main survey, we measure the systematic redshift error from an offset in the cross-correlation of the Lyman-α forest with quasars. We find evidence for a redshift dependent bias causing redshifts to be underestimated with increasing redshift, stemming from improper modeling of the Lyman-α optical depth in the templates used for redshift estimation. New templates were derived for the DESI Year 1 quasar sample at z > 1.6 and we found the redshift dependent bias, Δr ∥, increased from -1.94 ± 0.15 h -1 Mpc to -0.08 ± 0.04 h -1 Mpc (-205 ± 15 km s-1 to -9.0 ± 4.0 km s-1). These new templates will be used to provide redshifts... https://escholarship.org/uc/item/4dc7x4tz Tue, 8 Apr 2025 00:00:00 +0000 Bault, Abby Kirkby, David https://orcid.org/0000-0002-8828-5463 Guy, Julien https://orcid.org/0000-0001-9822-6793 Brodzeller, Allyson https://orcid.org/0000-0002-8934-0954 Aguilar, J Ahlen, S Bailey, S https://orcid.org/0000-0003-4162-6619 Brooks, D Cabayol-Garcia, L Chaves-Montero, J Claybaugh, T Cuceu, A Dawson, K de la Cruz, R de la Macorra, A Dey, A Doel, P Filbert, S Font-Ribera, A Forero-Romero, JE Gaztañaga, E Gontcho, S Gontcho A Gordon, C Herrera-Alcantar, HK Honscheid, K Iršič, V Karaçaylı, NG Kehoe, R Kisner, T Kremin, A https://orcid.org/0000-0001-6356-7424 Lambert, A Landriau, M https://orcid.org/0000-0003-1838-8528 Le Guillou, L Levi, ME Manera, M Martini, P Meisner, A Miquel, R Montero-Camacho, P Moustakas, J Muñoz-Gutiérrez, A Nie, J Niz, G Palanque-Delabrouille, N Percival, WJ Pérez-Ràfols, I Poppett, C Prada, F Ramírez-Pérez, C Ravoux, C Rezaie, M Rossi, G Sanchez, E Schlafly, EF https://orcid.org/0000-0002-3569-7421 Schlegel, D Schubnell, M Silber, J https://orcid.org/0000-0002-3461-0320 Tan, T Tarlé, G Walther, M Weaver, BA Zhou, Z https://escholarship.org/uc/item/2dt5w83t We present cosmological results from the measurement of baryon acoustic oscillations (BAO) in galaxy, quasar and Lyman-α forest tracers from the first year of observations from the Dark Energy Spectroscopic Instrument (DESI), to be released in the DESI Data Release 1. DESI BAO provide robust measurements of the transverse comoving distance and Hubble rate, or their combination, relative to the sound horizon, in seven redshift bins from over 6 million extragalactic objects in the redshift range 0.1 < z < 4.2. To mitigate confirmation bias, a blind analysis was implemented to measure the BAO scales. DESI BAO data alone are consistent with the standard flat ΛCDM cosmological model with a matter density Ωm=0.295±0.015. Paired with a baryon density prior from Big Bang Nucleosynthesis and the robustly measured acoustic angular scale from the cosmic microwave background (CMB), DESI requires H 0=(68.52±0.62) km s-1 Mpc-1. In conjunction with CMB anisotropies from Planck and CMB... https://escholarship.org/uc/item/2dt5w83t Tue, 8 Apr 2025 00:00:00 +0000 Adame, AG Aguilar, J Ahlen, S Alam, S Alexander, DM Alvarez, M Alves, O Anand, A https://orcid.org/0000-0003-2923-1585 Andrade, U Armengaud, E Avila, S Aviles, A Awan, H Bahr-Kalus, B Bailey, S https://orcid.org/0000-0003-4162-6619 Baltay, C Bault, A Behera, J BenZvi, S Bera, A Beutler, F Bianchi, D Blake, C Blum, R Brieden, S Brodzeller, A https://orcid.org/0000-0002-8934-0954 Brooks, D Buckley-Geer, E Burtin, E Calderon, R Canning, R Rosell, A Carnero Cereskaite, R Cervantes-Cota, JL Chabanier, S Chaussidon, E Chaves-Montero, J Chen, S Chen, X Claybaugh, T Cole, S Cuceu, A https://orcid.org/0000-0002-2169-0595 Davis, TM Dawson, K de la Macorra, A de Mattia, A Deiosso, N Dey, A Dey, B Ding, Z Doel, P Edelstein, J Eftekharzadeh, S Eisenstein, DJ Elliott, A Fagrelius, P Fanning, K Ferraro, S https://orcid.org/0000-0003-4992-7854 Ereza, J Findlay, N Flaugher, B Font-Ribera, A Forero-Sánchez, D Forero-Romero, JE Frenk, CS Garcia-Quintero, C Gaztañaga, E Gil-Marín, H Gontcho, S Gontcho A Gonzalez-Morales, AX Gonzalez-Perez, V Gordon, C Green, D Gruen, D Gsponer, R Gutierrez, G Guy, J Hadzhiyska, B Hahn, C Hanif, MMS Herrera-Alcantar, HK Honscheid, K Howlett, C Huterer, D Iršič, V Ishak, M Juneau, S Karaçaylı, NG Kehoe, R Kent, S Kirkby, D https://orcid.org/0000-0002-8828-5463 Kremin, A https://orcid.org/0000-0001-6356-7424 Krolewski, A Lai, Y Lan, T-W Landriau, M https://orcid.org/0000-0003-1838-8528 Lang, D Lasker, J Le Goff, JM Le Guillou, L https://escholarship.org/uc/item/23s378xf Millions of quasar spectra will be collected by the Dark Energy Spectroscopic Instrument (DESI), leading to a fourfold increase in the number of known quasars. High-accuracy quasar classification is essential to tighten constraints on cosmological parameters measured at the highest redshifts DESI observes (z > 2.0). We present spectral templates for identification and redshift estimation of quasars in the DESI Year 1 data release. The quasar templates are comprised of two quasar eigenspectra sets, trained on spectra from the Sloan Digital Sky Survey. The sets are specialized to reconstruct quasar spectral variation observed over separate yet overlapping redshift ranges and, together, are capable of identifying DESI quasars from 0.05 < z < 7.0. The new quasar templates show significant improvement over the previous DESI quasar templates regarding catastrophic failure rates, redshift precision and accuracy, quasar completeness, and the contamination fraction in the final... https://escholarship.org/uc/item/23s378xf Tue, 8 Apr 2025 00:00:00 +0000 Brodzeller, Allyson https://orcid.org/0000-0002-8934-0954 Dawson, Kyle Bailey, Stephen https://orcid.org/0000-0003-4162-6619 Yu, Jiaxi Ross, AJ Bault, A Filbert, S Aguilar, J Ahlen, S Alexander, David M Armengaud, E Berti, A Brooks, D Chaussidon, E de la Macorra, A Doel, P Fanning, K Fawcett, VA Font-Ribera, A Gontcho, S Gontcho A Guy, J https://orcid.org/0000-0001-9822-6793 Honscheid, K Juneau, S Kehoe, R Kisner, T Kremin, Anthony https://orcid.org/0000-0001-6356-7424 Lan, Ting-Wen Landriau, M https://orcid.org/0000-0003-1838-8528 Levi, Michael E https://orcid.org/0000-0003-1887-1018 Magneville, C Martini, Paul Meisner, Aaron M Miquel, R Moustakas, J Palanque-Delabrouille, N Percival, WJ Prada, F Ravoux, C Rossi, Graziano Saulder, C Siudek, M Tarlé, Gregory Weaver, BA Youles, S Zheng, Zheng Zhou, Rongpu https://orcid.org/0000-0001-5381-4372 Zhou, Zhimin https://escholarship.org/uc/item/20f4w28b Broad absorption line quasars (BALs) exhibit blueshifted absorption relative to a number of their prominent broad emission features. These absorption features can contribute to quasar redshift errors and add absorption to the Lyman-α (Lyα) forest that is unrelated to large-scale structure. We present a detailed analysis of the impact of BALs on the Baryon Acoustic Oscillation (BAO) results with the Lyα forest from the first year of data from the Dark Energy Spectroscopic Instrument (DESI). The baseline strategy for the first year analysis is to mask all pixels associated with all BAL absorption features that fall within the wavelength region used to measure the forest. We explore a range of alternate masking strategies and demonstrate that these changes have minimal impact on the BAO measurements with both DESI data and synthetic data. This includes when we mask the BAL features associated with emission lines outside of the forest region to minimize their contribution to redshift... https://escholarship.org/uc/item/20f4w28b Tue, 8 Apr 2025 00:00:00 +0000 Martini, P Cuceu, A https://orcid.org/0000-0002-2169-0595 Ennesser, L Brodzeller, A https://orcid.org/0000-0002-8934-0954 Aguilar, J Ahlen, S Brooks, D Claybaugh, T de Belsunce, R de la Macorra, A Dey, Arjun Doel, P Forero-Romero, JE Gaztañaga, E Gontcho, S Gontcho A Guy, J https://orcid.org/0000-0001-9822-6793 Herrera-Alcantar, HK Honscheid, K Karaçaylı, NG Kisner, T Kremin, A https://orcid.org/0000-0001-6356-7424 Lambert, A Le Guillou, L Manera, M Meisner, A Miquel, R Montero-Camacho, P Moustakas, J Niz, G Palanque-Delabrouille, N Percival, WJ Pérez-Ràfols, I Poppett, C Prada, F Ravoux, C Rezaie, M Rossi, G Sanchez, E Schlegel, D Schubnell, M Seo, H Sprayberry, D Tan, T Tarlé, G Walther, M Weaver, BA Zou, H https://escholarship.org/uc/item/0z21p7rc Baryon Acoustic Oscillations can be measured with sub-percent precision above redshift two with the Lyman-α (Lyα) forest auto-correlation and its cross-correlation with quasar positions. This is one of the key goals of the Dark Energy Spectroscopic Instrument (DESI) which started its main survey in May 2021. We present in this paper a study of the contaminants to the Lyα forest which are mainly caused by correlated signals introduced by the spectroscopic data processing pipeline as well as astrophysical contaminants due to foreground absorption in the intergalactic medium. Notably, an excess signal caused by the sky background subtraction noise is present in the Lyα auto-correlation in the first line-of-sight separation bin. We use synthetic data to isolate this contribution, we also characterize the effect of spectro-photometric calibration noise, and propose a simple model to account for both effects in the analysis of the Lyα forest. We then measure the auto-correlation of... https://escholarship.org/uc/item/0z21p7rc Tue, 8 Apr 2025 00:00:00 +0000 Guy, J https://orcid.org/0000-0001-9822-6793 Gontcho, S Gontcho A Armengaud, E Brodzeller, A https://orcid.org/0000-0002-8934-0954 Cuceu, A https://orcid.org/0000-0002-2169-0595 Font-Ribera, A Herrera-Alcantar, HK Karaçaylı, NG Muñoz-Gutiérrez, A Pieri, MM Pérez-Ràfols, I Ramírez-Pérez, C Ravoux, C Rich, J Walther, M Karim, M Abdul Aguilar, J Ahlen, S Bault, A Brooks, D Claybaugh, T de la Cruz, R de la Macorra, A Doel, P Fanning, K Forero-Romero, JE Gaztañaga, E Gonzalez-Morales, AX Gutierrez, G Hahn, C Honscheid, K Juneau, S Kehoe, R Kirkby, D https://orcid.org/0000-0002-8828-5463 Kisner, T Kremin, A https://orcid.org/0000-0001-6356-7424 Lambert, A Landriau, M https://orcid.org/0000-0003-1838-8528 Le Guillou, L Manera, M Martini, P Meisner, A Miquel, R Montero-Camacho, P Moustakas, J Mueller, E Myers, AD Nie, J Niz, G Palanque-Delabrouille, N Percival, WJ Poppett, C Rezaie, M Rossi, G Sanchez, E Schlegel, D Schubnell, M Seo, H Silber, J https://orcid.org/0000-0002-3461-0320 Sprayberry, D Tan, T Tarlé, G Vargas-Magaña, M Zou, H https://escholarship.org/uc/item/8465g5b1 We measure the high-intensity laser propagation throughout meter-scale, channel-guided laser-plasma accelerators by adjusting the length of the plasma channel on a shot-by-shot basis, showing high-quality guiding of 500 TW laser pulses over 30 cm in a hydrogen plasma of density n_{0}≈1×10^{17}  cm^{-3}. We observed transverse energy transport of higher-order modes in the first ≈12  cm of the plasma channel, followed by quasimatched propagation, and the gradual, dark-current-free depletion of laser energy to the wake. We quantify the laser-to-wake transfer efficiency limitations of currently available petawatt-class lasers and demonstrate via simulation how control over the laser mode can significantly improve beam parameters. Using 21.3 J of laser energy, and triggering localized electron injection, we observed electron bunches with single, quasimonoenergetic peaks up to 9.2 GeV with charge extending beyond 10 GeV. https://escholarship.org/uc/item/8465g5b1 Thu, 3 Apr 2025 00:00:00 +0000 Picksley, A Stackhouse, J Benedetti, C https://orcid.org/0000-0003-0408-1103 Nakamura, K https://orcid.org/0000-0001-9842-7114 Tsai, HE https://orcid.org/0000-0002-8667-5468 Li, R https://orcid.org/0009-0000-7576-4927 Miao, B Shrock, JE Rockafellow, E Milchberg, HM Schroeder, CB https://orcid.org/0000-0002-9610-0166 van Tilborg, J Esarey, E Geddes, CGR Gonsalves, AJ https://orcid.org/0000-0002-2567-7582 https://escholarship.org/uc/item/8jx4m6t8 The next generation of spectroscopic surveys is expected to achieve an unprecedented level of accuracy in the measurement of cosmological parameters. To avoid confirmation bias and thereby improve the reliability of these results, blinding procedures become a standard practice in the cosmological analyses of such surveys. Blinding is especially crucial when the impact of observational systematics is important relative to the cosmological signal, and a detection of that signal would have significant implications. This is the case for local primordial non-gaussianity, as probed by the scale-dependent bias of the galaxy power spectrum at large scales that are heavily sensitive to the dependence of the target selection on the imaging quality, known as imaging systematics. We propose a blinding method for the scale-dependent bias signature of local primordial non-gaussianity at the density field level which consists in generating a set of weights for the data that replicate the scale-dependent... https://escholarship.org/uc/item/8jx4m6t8 Tue, 1 Apr 2025 00:00:00 +0000 Chaussidon, E de Mattia, A Yèche, C Aguilar, J Ahlen, S Brooks, D Claybaugh, T Cole, S de la Macorra, A Doel, P Fanning, K Gaztañaga, E Gontcho, S Gontcho A Howlett, C Kisner, T Lambert, A Le Guillou, L Manera, M Meisner, A Miquel, R Niz, G Palanque-Delabrouille, N Percival, WJ Prada, F Ross, AJ Rossi, G Sanchez, E Schlegel, D Schubnell, M Seo, H Sprayberry, D Tarlé, G Vargas-Magaña, M Weaver, BA Zou, H https://escholarship.org/uc/item/5mz2b76f In this paper, we present the estimation of systematics related to the halo occupation distribution (HOD) modeling in the baryon acoustic oscillations (BAO) distance measurement of the Dark Energy Spectroscopic Instrument (DESI) 2024 analysis. This paper focuses on the study of HOD systematics for luminous red galaxies (LRG). We consider three different HOD models for LRGs, including the base 5-parameter vanilla model and two extensions to it, that we refer to as baseline and extended models. The baseline model is described by the 5 vanilla HOD parameters, an incompleteness factor and a velocity bias parameter, whereas the extended one also includes a galaxy assembly bias and a satellite profile parameter. We utilize the 25 dark matter simulations available in the AbacusSummit simulation suite at z=0.8 and generate mock catalogs for our different HOD models. To test the impact of the HOD modeling in the position of the BAO peak, we run BAO fits for all these sets of simulations... https://escholarship.org/uc/item/5mz2b76f Tue, 1 Apr 2025 00:00:00 +0000 Mena-Fernández, J Garcia-Quintero, C Yuan, S Hadzhiyska, B Alves, O Rashkovetskyi, M Seo, H Padmanabhan, N Nadathur, S Howlett, C Alam, S Rocher, A Ross, AJ Sanchez, E Ishak, M Aguilar, J Ahlen, S Andrade, U BenZvi, S Brooks, D Burtin, E Chen, S Chen, X Claybaugh, T Cole, S de la Macorra, A de Mattia, A Dey, Arjun Dey, B Ding, Z Doel, P Fanning, K Forero-Romero, JE Gaztañaga, E Gil-Marín, H Gontcho, S Gontcho A Gutierrez, G Guy, J https://orcid.org/0000-0001-9822-6793 Hahn, C Honscheid, K Juneau, S Kremin, A https://orcid.org/0000-0001-6356-7424 Landriau, M https://orcid.org/0000-0003-1838-8528 Le Guillou, L Levi, ME https://orcid.org/0000-0003-1887-1018 Manera, M Martini, P Medina-Varela, L Meisner, A Miquel, R Moustakas, J Mueller, E Muñoz-Gutiérrez, A Myers, AD Newman, JA Nie, J Niz, G Paillas, E Palanque-Delabrouille, N Percival, WJ Poppett, C Pérez-Fernández, A Rosado-Marin, A Rossi, G Ruggeri, R Saulder, C Schlegel, D Schubnell, M Sprayberry, D Tarlé, G Vargas-Magaña, M Weaver, BA Yu, J Zhang, H Zou, H https://escholarship.org/uc/item/5502f0rk DESI aims to provide one of the tightest constraints on cosmological parameters by analysing the clustering of more than thirty million galaxies. However, obtaining such constraints requires special care in validating the methodology and efforts to reduce the computational time required through data compression and emulation techniques. In this work, we perform a rigorous validation of the PyBird power spectrum modelling code with both a traditional emulated Full-Modelling approach and the model-independent ShapeFit compression approach. By using cubic box simulations that accurately reproduce the clustering and precision of the DESI survey, we find that the cosmological constraints from ShapeFit and Full-Modelling are consistent with each other at the ∼ 0.5σ level for the ΛCDM model. Both ShapeFit and Full-Modelling are also consistent with the true ΛCDM simulation cosmology down to a scale of k max = 0.20 hMpc-1 even after including the hexadecapole. For extended models such... https://escholarship.org/uc/item/5502f0rk Tue, 1 Apr 2025 00:00:00 +0000 Lai, Y Howlett, C Maus, M Gil-Marín, H Noriega, HE Ramírez-Solano, S Zarrouk, P Aguilar, J Ahlen, S Alves, O Aviles, A Brooks, D Chen, S Claybaugh, T Davis, TM Dawson, K de la Macorra, A Doel, P Forero-Romero, JE Gaztañaga, E Gontcho, S Gontcho A Honscheid, K Juneau, S Landriau, M https://orcid.org/0000-0003-1838-8528 Manera, M Miquel, R Mueller, E Nadathur, S Niz, G Palanque-Delabrouille, N Percival, W Poppett, C Rezaie, M Rossi, G Sanchez, E Schubnell, M Sprayberry, D Tarlé, G Vargas-Magaña, M Verde, L Yuan, S Zhou, R https://orcid.org/0000-0001-5381-4372 Zou, H https://escholarship.org/uc/item/0tc9r96f Excitation of long-lived states in bromine nuclei using a tabletop laser-plasma accelerator providing pulsed (<100  fs) electron beams provided a sensitive probe of γ strength and level densities in the nuclear quasicontinuum and may indicate angular momentum coupling through electron-nuclear interactions. Solid-density active LaBr_{3} targets absorb real and virtual photons up to 35±2.5  MeV and deexcite through γ cascade into different states. A factor of 4.354±0.932 enhancement of the ^{80}Br^{m}/^{80}Br^{g} isomeric ratio was observed following electron irradiation, as compared to bremsstrahlung. Additional angular momentum transfer could possibly occur through nuclear-plasma or electron-nuclear interactions enabled by the ultrashort electron beam. Further investigation of these mechanisms could have far-reaching impact including decreased storage of long-term nuclear waste and an improved understanding of heavy element formation in astrophysical settings. https://escholarship.org/uc/item/0tc9r96f Tue, 25 Mar 2025 00:00:00 +0000 Jacob, Robert E https://orcid.org/0000-0001-6484-9917 Tannous, Speero M Bernstein, Lee A Brown, Joshua Ostermayr, Tobias Chen, Qiang Schneider, Dieter HG Schroeder, Carl B van Tilborg, Jeroen Esarey, Eric H Geddes, Cameron GR https://escholarship.org/uc/item/5z01m0wp Context. Gravitationally lensed type Ia supernovae (glSNe Ia) are unique astronomical tools that can be used to study cosmological parameters, distributions of dark matter, the astrophysics of the supernovae, and the intervening lensing galaxies themselves. A small number of highly magnified glSNe Ia have been discovered by ground-based telescopes such as the Zwicky Transient Facility (ZTF), but simulations predict that a fainter, undetected population may also exist. Aims. We present a systematic search for glSNe Ia in the ZTF archive of alerts distributed from June 1 2019 to September 1 2022. Methods. Using the AMPEL platform, we developed a pipeline that distinguishes candidate glSNe Ia from other variable sources. Initial cuts were applied to the ZTF alert photometry (with constraints on the peak absolute magnitude and the distance to a catalogue-matched galaxy, as examples) before forced photometry was obtained for the remaining candidates. Additional cuts were applied... https://escholarship.org/uc/item/5z01m0wp Wed, 12 Mar 2025 00:00:00 +0000 Townsend, A Nordin, J Carracedo, A Sagués Kowalski, M Arendse, N Dhawan, S Goobar, A Johansson, J Mörtsell, E Schulze, S Andreoni, I Fernández, E Kim, AG https://orcid.org/0000-0001-6315-8743 Nugent, PE https://orcid.org/0000-0002-3389-0586 Prada, F Rigault, M Sarin, N Sharma, D Bellm, EC Coughlin, MW Dekany, R Groom, SL Lacroix, L Laher, RR Riddle, R Aguilar, J Ahlen, S Bailey, S https://orcid.org/0000-0003-4162-6619 Brooks, D Claybaugh, T de la Macorra, A Dey, A Dey, B Doel, P Fanning, K Forero-Romero, JE Gaztañaga, E Gontcho, S Gontcho A Honscheid, K Howlett, C Kisner, T Kremin, A https://orcid.org/0000-0001-6356-7424 Lambert, A https://orcid.org/0009-0003-5658-2601 Landriau, M https://orcid.org/0000-0003-1838-8528 Le Guillou, L Levi, ME https://orcid.org/0000-0003-1887-1018 Manera, M Meisner, A Miquel, R Moustakas, J Mueller, E Myers, AD Nie, J Palanque-Delabrouille, N Poppett, C Rezaie, M Rossi, G Sanchez, E Schlegel, D https://orcid.org/0000-0002-5042-5088 Schubnell, M Seo, H Sprayberry, D Tarlé, G Zou, H https://escholarship.org/uc/item/35053859 Background: Neutron-rich nuclei in the A≈100 mass region are interesting due to a rapid shape transition, especially pronounced in the Zr isotopes, and more recently observed in Nb isotopes. Nb98, with only one proton and one neutron outside the subshell closure nucleus of Zr96, is amenable to shell model calculations. Purpose: To further examine the rapid shape transition, the yrast structure of Nb98 was established in this work. This was the only yrast structure missing from all immediate neighbors to Zr96. Method: The yrast structure of Nb98 was studied in the fission of the compound systems formed in three heavy-ion induced reactions, Mg24 (134.5 MeV) +Yb173, Na23 (129 MeV) +Yb176, and O18 (91 MeV) +Pb208. Prompt γ-ray spectroscopy was accomplished using the Gammasphere array. Results: Excitation energies up to 3 MeV were observed for the first time in Nb98. The yrast structure above the previously known (5)+ isomer was established. In the process of studying Nb98 the yrast... https://escholarship.org/uc/item/35053859 Wed, 12 Feb 2025 00:00:00 +0000 Fotiades, N Cizewski, JA Fallon, P Kevrekidis, PG Krücken, R Lee, IY https://escholarship.org/uc/item/9zb2d29s We present a method to mitigate the effects of fiber assignment incompleteness in two-point power spectrum and correlation function measurements from galaxy spectroscopic surveys, by truncating small angular scales from estimators. We derive the corresponding modified correlation function and power spectrum windows to account for the small angular scale truncation in the theory prediction. We validate this approach on simulations reproducing the Dark Energy Spectroscopic Instrument (DESI) Data Release 1 (DR1) with and without fiber assignment. We show that we recover unbiased cosmological constraints using small angular scale truncated estimators from simulations with fiber assignment incompleteness, with respect to standard estimators from complete simulations. Additionally, we present an approach to remove the sensitivity of the fits to high k modes in the theoretical power spectrum, by applying a transformation to the data vector and window matrix. We find that our method efficiently... https://escholarship.org/uc/item/9zb2d29s Tue, 11 Feb 2025 00:00:00 +0000 Pinon, M de Mattia, A McDonald, P https://orcid.org/0000-0001-8346-8394 Burtin, E Ruhlmann-Kleider, V White, M https://orcid.org/0000-0001-9912-5070 Bianchi, D Ross, AJ Aguilar, J Ahlen, S Brooks, D Cahn, RN Chaussidon, E Claybaugh, T Cole, S de la Macorra, A Dey, B Doel, P Fanning, K Forero-Romero, JE Gaztañaga, E Gontcho, S Gontcho A Howlett, C Kirkby, D https://orcid.org/0000-0002-8828-5463 Kisner, T Kremin, A https://orcid.org/0000-0001-6356-7424 Lambert, A Landriau, M https://orcid.org/0000-0003-1838-8528 Lasker, J Le Guillou, L Levi, ME https://orcid.org/0000-0003-1887-1018 Manera, M Martini, P Meisner, A Miquel, R Moustakas, J Myers, AD Niz, G Palanque-Delabrouille, N Percival, WJ Poppett, C Rossi, G Sanchez, E Schlegel, D https://orcid.org/0000-0002-5042-5088 Schubnell, M Seo, H Sprayberry, D Tarlé, G Vargas-Magaña, M Weaver, BA Zarrouk, P Zhou, R https://orcid.org/0000-0001-5381-4372 Zou, H https://escholarship.org/uc/item/9c75z2jn We present the measurement of Baryon Acoustic Oscillations (BAO) from the Lyman-α (Lyα) forest of high-redshift quasars with the first-year dataset of the Dark Energy Spectroscopic Instrument (DESI). Our analysis uses over 420 000 Lyα forest spectra and their correlation with the spatial distribution of more than 700 000 quasars. An essential facet of this work is the development of a new analysis methodology on a blinded dataset. We conducted rigorous tests using synthetic data to ensure the reliability of our methodology and findings before unblinding. Additionally, we conducted multiple data splits to assess the consistency of the results and scrutinized various analysis approaches to confirm their robustness. For a given value of the sound horizon (rd ), we measure the expansion at z eff = 2.33 with 2% precision, H(z eff) = ( 239.2 ± 4.8 ) (147.09 Mpc /rd ) km/s/Mpc. Similarly, we present a 2.4% measurement of the transverse comoving distance to the same redshift, DM (z eff)... https://escholarship.org/uc/item/9c75z2jn Tue, 11 Feb 2025 00:00:00 +0000 Adame, AG Aguilar, J Ahlen, S Alam, S Alexander, DM Alvarez, M Alves, O Anand, A https://orcid.org/0000-0003-2923-1585 Andrade, U Armengaud, E Avila, S Aviles, A Awan, H Bailey, S https://orcid.org/0000-0003-4162-6619 Baltay, C Bault, A Bautista, J Behera, J BenZvi, S Beutler, F Bianchi, D Blake, C Blum, R Brieden, S Brodzeller, A https://orcid.org/0000-0002-8934-0954 Brooks, D Buckley-Geer, E Burtin, E Calderon, R Canning, R Rosell, A Carnero Cereskaite, R Cervantes-Cota, JL Chabanier, S Chaussidon, E Chaves-Montero, J Chen, S Chen, X Claybaugh, T Cole, S Cuceu, A https://orcid.org/0000-0002-2169-0595 Davis, TM Dawson, K de la Cruz, R de la Macorra, A de Mattia, A Deiosso, N Dey, A Dey, B Ding, J Ding, Z Doel, P Edelstein, J Eftekharzadeh, S Eisenstein, DJ Elliott, A Fagrelius, P Fanning, K Ferraro, S https://orcid.org/0000-0003-4992-7854 Ereza, J Findlay, N Flaugher, B Font-Ribera, A Forero-Sánchez, D Forero-Romero, JE Garcia-Quintero, C Gaztañaga, E Gil-Marín, H Gontcho, S Gontcho A Gonzalez-Morales, AX Gonzalez-Perez, V Gordon, C Green, D Gruen, D Gsponer, R Gutierrez, G Guy, J https://orcid.org/0000-0001-9822-6793 Hadzhiyska, B Hahn, C Hanif, MMS Herrera-Alcantar, HK Honscheid, K Howlett, C Huterer, D Iršič, V Ishak, M Juneau, S Karaçaylı, NG Kehoe, R Kent, S Kirkby, D https://orcid.org/0000-0002-8828-5463 Kremin, A https://orcid.org/0000-0003-0667-5941 Krolewski, A Lai, Y Lan, T-W Landriau, M https://orcid.org/0000-0003-1838-8528 Lang, D Lasker, J Le Goff, JM Le Guillou, L https://escholarship.org/uc/item/7616m4qf In order to address fundamental questions related to the expansion history of the Universe and its primordial nature with the next generation of galaxy experiments, we need to model reliably large-scale structure observables such as the correlation function and the power spectrum. Cosmological N-body simulations provide a reference through which we can test our models, but their output suffers from sample variance on large scales. Fortunately, this is the regime where accurate analytic approximations exist. To reduce the variance, which is key to making optimal use of these simulations, we can leverage the accuracy and precision of such analytic descriptions using Control Variates (CV). The power of control variates stems from utilizing inexpensive but highly correlated surrogates of the statistics one wishes to measure. The stronger the correlation between the surrogate and the statistic of interest, the larger the variance reduction delivered by the method. We apply two control... https://escholarship.org/uc/item/7616m4qf Tue, 11 Feb 2025 00:00:00 +0000 Hadzhiyska, Boryana White, Martin J https://orcid.org/0000-0001-9912-5070 Chen, Xinyi Garrison, Lehman H DeRose, Joseph Padmanabhan, Nikhil Garcia-Quintero, Cristhian Mena-Fernández, Juan Chen, Shi-Fan Seo, Hee-Jong McDonald, Patrick https://orcid.org/0000-0001-8346-8394 Aguilar, Jessica Ahlen, Steven Brooks, David Claybaugh, Todd de la Macorra, Axel Doel, Peter Font-Ribera, Andreu Forero-Romero, Jaime E Gontcho, Satya Gontcho A Honscheid, Klaus Kremin, Anthony https://orcid.org/0000-0001-6356-7424 Landriau, Martin Manera, Marc Miquel, Ramon Nie, Jundan Palanque-Delabrouille, Nathalie Rezaie, Mehdi Rossi, Graziano Sanchez, Eusebio Schubnell, Michael Tarlé, Gregoy Zhou, Zhimin https://escholarship.org/uc/item/6jn2057t In anticipation of forthcoming data releases of current and future spectroscopic surveys, we present the validation tests and analysis of systematic effects within velocileptors modeling pipeline when fitting mock data from the AbacusSummit N-body simulations. We compare the constraints obtained from parameter compression methods to the direct fitting (Full-Modeling) approaches of modeling the galaxy power spectra, and show that the ShapeFit extension to the traditional template method is consistent with the Full-Modeling method within the standard ΛCDM parameter space. We show the dependence on scale cuts when fitting the different redshift bins using the ShapeFit and Full-Modeling methods. We test the ability to jointly fit data from multiple redshift bins as well as joint analysis of the pre-reconstruction power spectrum with the post-reconstruction BAO correlation function signal. We further demonstrate the behavior of the model when opening up the parameter space beyond ΛCDM... https://escholarship.org/uc/item/6jn2057t Tue, 11 Feb 2025 00:00:00 +0000 Maus, M Chen, S White, M https://orcid.org/0000-0001-9912-5070 Aguilar, J Ahlen, S Aviles, A Brieden, S Brooks, D Claybaugh, T Cole, S de la Macorra, A Dey, Arjun Doel, P Ferraro, S https://orcid.org/0000-0003-4992-7854 Findlay, N Forero-Romero, JE Gaztañaga, E Gil-Marín, H Gontcho, S Gontcho A Hahn, C Honscheid, K Howlett, C Ishak, M Juneau, S Kremin, A https://orcid.org/0000-0001-6356-7424 Lai, Y Landriau, M https://orcid.org/0000-0003-1838-8528 Levi, ME https://orcid.org/0000-0003-1887-1018 Manera, M Miquel, R Mueller, E Myers, AD Nadathur, S Nie, J Noriega, HE Palanque-Delabrouille, N Percival, WJ Poppett, C Ramirez-Solano, S Rezaie, M Rocher, A Rossi, G Sanchez, E Schlegel, D Schubnell, M Seo, H Sprayberry, D Tarlé, G Vargas-Magaña, M Weaver, BA Yuan, S Zarrouk, P Zhang, H Zhou, R https://orcid.org/0000-0001-5381-4372 Zou, H https://escholarship.org/uc/item/3fs7f4rp In preparation for the next generation of galaxy redshift surveys, and in particular the year-one data release from the Dark Energy Spectroscopic Instrument (DESI), we investigate the consistency of a variety of effective field theory models that describe the galaxy-galaxy power spectra in redshift space into the quasi-linear regime using 1-loop perturbation theory. These models are employed in the pipelines velocileptors, PyBird, and Folpsν . While these models have been validated independently, a detailed comparison with consistent choices has not been attempted. After briefly discussing the theoretical differences between the models we describe how to provide a more apples-to-apples comparison between them. We present the results of fitting mock spectra from the AbacusSummit suite of N-body simulations provided in three redshift bins to mimic the types of dark time tracers targeted by the DESI survey. We show that the theories behave similarly and give consistent constraints... https://escholarship.org/uc/item/3fs7f4rp Tue, 11 Feb 2025 00:00:00 +0000 Maus, M Lai, Y Noriega, HE Ramirez-Solano, S Aviles, A Chen, S Fromenteau, S Gil-Marín, H Howlett, C Vargas-Magaña, M White, M https://orcid.org/0000-0001-9912-5070 Zarrouk, P Aguilar, J Ahlen, S Alves, O Brieden, S Brooks, D Burtin, E Claybaugh, T Cole, S Dawson, K Icaza-Lizaola, M de la Macorra, A de Mattia, A Doel, P Ferraro, S https://orcid.org/0000-0003-4992-7854 Findlay, N Forero-Romero, JE Gaztañaga, E Gontcho, S Gontcho A Hahn, C Honscheid, K Ishak, M Kremin, A https://orcid.org/0000-0001-6356-7424 Landriau, M https://orcid.org/0000-0003-1838-8528 Le Guillou, L Manera, M Miquel, R Mueller, E Nadathur, S Niz, G Palanque-Delabrouille, N Percival, WJ Poppett, C Prada, F Rezaie, M Rocher, A Rossi, G Sanchez, E Schlegel, D Schubnell, M Sprayberry, D Tarlé, G Yuan, S Zhao, R Zhou, R https://orcid.org/0000-0001-5381-4372 Zou, H https://escholarship.org/uc/item/1817s52c We present a high-significance cross-correlation of CMB lensing maps from the Atacama Cosmology Telescope (ACT) Data Release 6 (DR6) with luminous red galaxies (LRGs) from the Dark Energy Spectroscopic Instrument (DESI) Legacy Survey spectroscopically calibrated by DESI. We detect this cross-correlation at a significance of 38σ; combining our measurement with the Planck Public Release 4 (PR4) lensing map, we detect the cross-correlation at 50σ. Fitting this jointly with the galaxy auto-correlation power spectrum to break the galaxy bias degeneracy with σ 8, we perform a tomographic analysis in four LRG redshift bins spanning 0.4 ≤ z ≤ 1.0 to constrain the amplitude of matter density fluctuations through the parameter combination S 8 × = σ 8 (Ω m / 0.3)0.4. Prior to unblinding, we confirm with extragalactic simulations that foreground biases are negligible and carry out a comprehensive suite of null and consistency tests. Using a hybrid effective field theory (HEFT) model that... https://escholarship.org/uc/item/1817s52c Tue, 11 Feb 2025 00:00:00 +0000 Kim, Joshua Sailer, Noah Madhavacheril, Mathew S Ferraro, Simone https://orcid.org/0000-0003-4992-7854 Abril-Cabezas, Irene Aguilar, Jessica Nicole Ahlen, Steven Bond, J Richard Brooks, David Burtin, Etienne Calabrese, Erminia Chen, Shi-Fan Choi, Steve K https://orcid.org/0000-0002-9113-7058 Claybaugh, Todd Darwish, Omar de la Macorra, Axel DeRose, Joseph Devlin, Mark Dey, Arjun Doel, Peter Dunkley, Jo Embil-Villagra, Carmen Farren, Gerrit S https://orcid.org/0000-0001-5704-1127 Font-Ribera, Andreu Forero-Romero, Jaime E Gaztañaga, Enrique Gluscevic, Vera Gontcho, Satya Gontcho A Guy, Julien https://orcid.org/0000-0001-9822-6793 Honscheid, Klaus Howlett, Cullan Kirkby, David https://orcid.org/0000-0002-8828-5463 Kisner, Theodore Kremin, Anthony https://orcid.org/0000-0001-6356-7424 Landriau, Martin https://orcid.org/0000-0003-1838-8528 Le Guillou, Laurent Levi, Michael E https://orcid.org/0000-0003-1887-1018 MacCrann, Niall Manera, Marc Marques, Gabriela A Meisner, Aaron Miquel, Ramon Moodley, Kavilan Moustakas, John Newburgh, Laura B Newman, Jeffrey A Niz, Gustavo Orlowski-Scherer, John Palanque-Delabrouille, Nathalie Percival, Will J Prada, Francisco Qu, Frank J Rossi, Graziano Sanchez, Eusebio Schaan, Emmanuel https://orcid.org/0000-0002-4619-8927 Schlafly, Edward F https://orcid.org/0000-0002-3569-7421 Schlegel, David Schubnell, Michael Sehgal, Neelima Seo, Hee-Jung Shaikh, Shabbir Sherwin, Blake D Sifón, Cristóbal Sprayberry, David Staggs, Suzanne T Tarlé, Gregory van Engelen, Alexander Weaver, Benjamin Alan Wenzl, Lukas White, Martin https://orcid.org/0000-0001-9912-5070 Wollack, Edward J Yèche, Christophe Zou, Hu https://escholarship.org/uc/item/442129hp Synthetic data sets are used in cosmology to test analysis procedures, to verify that systematic errors are well understood and to demonstrate that measurements are unbiased. In this work we describe the methods used to generate synthetic datasets of Lyman-α quasar spectra aimed for studies with the Dark Energy Spectroscopic Instrument (DESI). In particular, we focus on demonstrating that our simulations reproduces important features of real samples, making them suitable to test the analysis methods to be used in DESI and to place limits on systematic effects on measurements of Baryon Acoustic Oscillations (BAO). We present a set of mocks that reproduce the statistical properties of the DESI early data set with good agreement. Additionally, we use a synthetic dataset to forecast the BAO scale constraining power of the completed DESI survey through the Lyman-α forest. https://escholarship.org/uc/item/442129hp Tue, 4 Feb 2025 00:00:00 +0000 Herrera-Alcantar, Hiram K Muñoz-Gutiérrez, Andrea Tan, Ting González-Morales, Alma X Font-Ribera, Andreu Guy, Julien https://orcid.org/0000-0001-9822-6793 Moustakas, John Kirkby, David https://orcid.org/0000-0002-8828-5463 Armengaud, E Bault, A Cabayol-Garcia, L Chaves-Montero, J Cuceu, A https://orcid.org/0000-0002-2169-0595 de la Cruz, R García, LÁ Gordon, C Iršič, V Karaçaylı, NG Le Goff, JM Montero-Camacho, P Niz, G Pérez-Ràfols, I Ramírez-Pérez, C Ravoux, C Walther, M Aguilar, J Ahlen, S Brooks, D Claybaugh, T Dawson, K de la Macorra, A Doel, P Forero-Romero, JE Gaztañaga, E Gontcho, S Gontcho A Honscheid, K Kehoe, R Kisner, T Landriau, M https://orcid.org/0000-0003-1838-8528 Levi, Michael E https://orcid.org/0000-0003-1887-1018 Manera, M Martini, P Meisner, A Miquel, R Nie, J Palanque-Delabrouille, N Poppett, C Rezaie, M Rossi, G Sanchez, E Seo, H Tarlé, G Weaver, BA Zhou, Z https://escholarship.org/uc/item/1wd1z6td The interaction of an ultra-intense laser pulse with a near critical density target results in the formation of a plasma channel, a strong azimuthal magnetic field and moving vortices. An application of this is the generation of energetic and collimated ion beams via magnetic vortex acceleration. The optimized regime of magnetic vortex acceleration is becoming experimentally accessible with new high intensity laser beamlines coming online and advances made in near critical density target fabrication. The robustness of the acceleration mechanism with realistic experimental conditions is examined with three-dimensional simulations. Of particular interest is the acceleration performance with different laser temporal contrast conditions, in some cases leading to pre-expanded target profiles prior to the arrival of the main pulse. Preplasma effects on the structure of the accelerating fields are explored, including a detailed analysis of the ion beam properties and the efficiency of... https://escholarship.org/uc/item/1wd1z6td Tue, 28 Jan 2025 00:00:00 +0000 Hakimi, Sahel Bulanov, Stepan S https://orcid.org/0000-0002-9861-9391 Huebl, Axel https://orcid.org/0000-0003-1943-7141 Obst-Huebl, Lieselotte https://orcid.org/0000-0001-9236-8037 Nakamura, Kei https://orcid.org/0000-0001-9842-7114 Gonsalves, Anthony https://orcid.org/0000-0002-2567-7582 Schenkel, Thomas https://orcid.org/0000-0003-4046-9252 van Tilborg, Jeroen Vay, Jean-Luc Schroeder, Carl B https://orcid.org/0000-0002-9610-0166 Esarey, Eric Geddes, Cameron R https://escholarship.org/uc/item/5r82464k The squeezed cross-bispectrum Bκ,Lyα between the gravitational lensing in the cosmic microwave background and the 1D Lyα forest power spectrum can constrain bias parameters and break degeneracies between σ8 and other cosmological parameters. We detect Bκ,Lyα with 4.8σ significance at an effective redshift zeff=2.4 using Planck PR3 lensing map and over 280,000 quasar spectra from the Dark Energy Spectroscopic Instrument’s first-year data. We test our measurement against metal contamination and foregrounds such as Galactic extinction and clusters of galaxies by deprojecting the thermal Sunyaev-Zeldovich effect. We compare our results to a tree-level perturbation theory calculation and find reasonable agreement between the model and measurement. https://escholarship.org/uc/item/5r82464k Wed, 22 Jan 2025 00:00:00 +0000 Karaçaylı, Naim Göksel Martini, Paul Weinberg, David H Ferraro, Simone https://orcid.org/0000-0003-4992-7854 de Belsunce, Roger Aguilar, J Ahlen, S Armengaud, E Brooks, D Claybaugh, T de la Macorra, A Dey, B Doel, P Fanning, K Forero-Romero, JE Gontcho, S Gontcho A Gonzalez-Morales, AX Gutierrez, G Guy, J https://orcid.org/0000-0001-9822-6793 Honscheid, K Kirkby, D https://orcid.org/0000-0002-8828-5463 Kisner, T Kremin, A https://orcid.org/0000-0001-6356-7424 Lambert, A Landriau, M https://orcid.org/0000-0003-1838-8528 Le Guillou, L Levi, ME Manera, M Meisner, A Miquel, R Mueller, E Muñoz-Gutiérrez, A Myers, AD Newman, JA Nie, J Niz, G Palanque-Delabrouille, N Percival, WJ Poppett, C Prada, F Ravoux, C Rezaie, M Ross, AJ Rossi, G Sanchez, E Schlafly, EF https://orcid.org/0000-0002-3569-7421 Schlegel, D Seo, H Sprayberry, D Tan, T Tarlé, G Weaver, BA Zou, H https://escholarship.org/uc/item/867528n7 We implement Crossing Statistics to reconstruct in a model-agnostic manner the expansion history of the universe and properties of dark energy, using DESI Data Release 1 (DR1) BAO data in combination with one of three different supernova compilations (PantheonPlus, Union3, and DES-SN5YR) and Planck CMB observations. Our results hint towards an evolving and emergent dark energy behaviour, with negligible presence of dark energy at z ≳ 1, at varying significance depending on data sets combined. In all these reconstructions, the cosmological constant lies outside the 95% confidence intervals for some redshift ranges. This dark energy behaviour, reconstructed using Crossing Statistics, is in agreement with results from the conventional w 0–w a dark energy equation of state parametrization reported in the DESI Key cosmology paper. Our results add an extensive class of model-agnostic reconstructions with acceptable fits to the data, including models where cosmic acceleration slows down... https://escholarship.org/uc/item/867528n7 Mon, 6 Jan 2025 00:00:00 +0000 Calderon, R Lodha, K Shafieloo, A Linder, E Sohn, W de Mattia, A Cervantes-Cota, JL Crittenden, R Davis, TM Ishak, M Kim, AG https://orcid.org/0000-0001-6315-8743 Matthewson, W Niz, G Park, S Aguilar, J Ahlen, S Allen, S Brooks, D Claybaugh, T de la Macorra, A Dey, A Dey, B Doel, P Forero-Romero, JE Gaztañaga, E Gontcho, S Gontcho A Honscheid, K Howlett, C Juneau, S Kremin, A https://orcid.org/0000-0001-6356-7424 Landriau, M https://orcid.org/0000-0003-1838-8528 Le Guillou, L Levi, ME https://orcid.org/0000-0003-1887-1018 Manera, M Miquel, R Moustakas, J Newman, JA Palanque-Delabrouille, N Percival, WJ Poppett, C Prada, F Rezaie, M Rossi, G Ruhlmann-Kleider, V Sanchez, E Schlegel, D https://orcid.org/0000-0002-5042-5088 Schubnell, M Seo, H Sprayberry, D Tarlé, G Taylor, P Vargas-Magaña, M Weaver, BA Zarrouk, P Zou, H https://escholarship.org/uc/item/6zh078qk ABSTRACT The Early Data Release (EDR) of the Dark Energy Spectroscopic Instrument (DESI) comprises spectroscopy obtained from 2020 December 14 to 2021 June 10. White dwarfs were targeted by DESI both as calibration sources and as science targets and were selected based on Gaia photometry and astrometry. Here, we present the DESI EDR white dwarf catalogue, which includes 2706 spectroscopically confirmed white dwarfs of which approximately 60 per cent have been spectroscopically observed for the first time, as well as 66 white dwarf binary systems. We provide spectral classifications for all white dwarfs, and discuss their distribution within the Gaia Hertzsprung–Russell diagram. We provide atmospheric parameters derived from spectroscopic and photometric fits for white dwarfs with pure hydrogen or helium photospheres, a mixture of those two, and white dwarfs displaying carbon features in their spectra. We also discuss the less abundant systems in the sample, such as those with... https://escholarship.org/uc/item/6zh078qk Mon, 9 Dec 2024 00:00:00 +0000 Manser, Christopher J Izquierdo, Paula Gänsicke, Boris T Swan, Andrew Koester, Detlev Robert, Akshay Xu, Siyi Inight, Keith Amroota, Ben Fusillo, NP Gentile Koposov, Sergey E Kim, Bokyoung Dey, Arjun Prieto, Carlos Allende Aguilar, J Ahlen, S Blum, R Brooks, D Claybaugh, T Cooper, AP Dawson, K de la Macorra, A Doel, P Forero-Romero, JE Gaztañaga, E Gontcho, S Gontcho A Honscheid, K Kisner, T Kremin, A https://orcid.org/0000-0001-6356-7424 Lambert, A Landriau, M https://orcid.org/0000-0003-1838-8528 Le Guillou, L Levi, Michael E Li, TS Meisner, A Miquel, R Moustakas, J Nie, J Palanque-Delabrouille, N Percival, WJ Poppett, C Prada, F Rezaie, M Rossi, G Sanchez, E Schlafly, EF https://orcid.org/0000-0002-3569-7421 Schlegel, D Schubnell, M Seo, H Silber, J https://orcid.org/0000-0002-3461-0320 Tarlé, G Weaver, BA Zhou, Z Zou, H https://escholarship.org/uc/item/5nd0x78t In this work we use Lagrangian perturbation theory to analyze the harmonic space galaxy clustering signal of the Bright Galaxy Survey (BGS) and luminous red galaxies (LRGs) targeted by the dark energy spectroscopic instrument (DESI), combined with the galaxy-galaxy lensing signal measured around these galaxies using Dark Energy Survey Year 3 source galaxies. The BGS and LRG galaxies are extremely well characterized by DESI spectroscopy and, as a result, lens galaxy redshift uncertainty and photometric systematics contribute negligibly to the error budget of our “2×2-point” analysis. On the modeling side, this work represents the first application of the spinosaurus code, implementing an effective field theory model for galaxy intrinsic alignments, and we additionally introduce a new scheme (maiar) for marginalizing over the large uncertainties in the redshift evolution of the intrinsic alignment signal. Furthermore, this is the first application of a hybrid effective field theory... https://escholarship.org/uc/item/5nd0x78t Tue, 3 Dec 2024 00:00:00 +0000 Chen, S DeRose, J Zhou, R https://orcid.org/0000-0001-5381-4372 White, M https://orcid.org/0000-0001-9912-5070 Ferraro, S https://orcid.org/0000-0003-4992-7854 Blake, C Lange, JU Wechsler, RH Aguilar, J Ahlen, S Brooks, D Claybaugh, T Dawson, K de la Macorra, A Doel, P Font-Ribera, A Gaztañaga, E Gontcho, S Gontcho A Gutierrez, G Honscheid, K Howlett, C Kehoe, R Kirkby, D https://orcid.org/0000-0002-8828-5463 Kisner, T Kremin, A https://orcid.org/0000-0001-6356-7424 Landriau, M https://orcid.org/0000-0003-1838-8528 Le Guillou, L Manera, M Meisner, A Miquel, R Newman, JA Niz, G Palanque-Delabrouille, N Percival, WJ Prada, F Rossi, G Sanchez, E Schlegel, D Schubnell, M Sprayberry, D Tarlé, G Weaver, BA https://escholarship.org/uc/item/20q8g3mt Abstract This paper provides a comprehensive overview of how fitting of Baryon Acoustic Oscillations (BAO) is carried out within the upcoming Dark Energy Spectroscopic Instrument’s (DESI) 2024 results using its DR1 dataset, and the associated systematic error budget from theory and modelling of the BAO. We derive new results showing how non-linearities in the clustering of galaxies can cause potential biases in measurements of the isotropic (αiso) and anisotropic (αap) BAO distance scales, and how these can be effectively removed with an appropriate choice of reconstruction algorithm. We then demonstrate how theory leads to a clear choice for how to model the BAO and develop, implement and validate a new model for the remaining smooth-broadband (i.e., without BAO) component of the galaxy clustering. Finally, we explore the impact of all remaining modelling choices on the BAO constraints from DESI using a suite of high-precision simulations, arriving at a set of best-practices... https://escholarship.org/uc/item/20q8g3mt Tue, 19 Nov 2024 00:00:00 +0000 Chen, Shi-Fan Howlett, Cullan White, Martin https://orcid.org/0000-0001-9912-5070 McDonald, Patrick https://orcid.org/0000-0001-8346-8394 Ross, Ashley J Seo, Hee-Jong Padmanabhan, Nikhil Aguilar, J Ahlen, S Alam, S Alves, O Andrade, U Blum, R Brooks, D Chen, X Cole, S Dawson, K de la Macorra, A Dey, Arjun Ding, Z Doel, P Ferraro, S https://orcid.org/0000-0003-4992-7854 Font-Ribera, A Forero-Sánchez, D Forero-Romero, JE Garcia-Quintero, C Gaztañaga, E Gontcho, S Gontcho A Hanif, MMS Honscheid, K Kisner, T Kremin, A https://orcid.org/0000-0001-6356-7424 Lambert, A Landriau, M https://orcid.org/0000-0003-1838-8528 Levi, ME Manera, M Meisner, A Mena-Fernández, J Miquel, R Munoz-Gutierrez, A Paillas, E Palanque-Delabrouille, N Percival, WJ Pérez-Fernández, A Prada, F Rashkovetskyi, M Rezaie, M Rosado-Marin, A Rossi, G Ruggeri, R Sanchez, E Schlegel, D Silber, J https://orcid.org/0000-0002-3461-0320 Tarlé, G Vargas-Magaña, M Weaver, BA Yu, J Yuan, S Zhou, R Zhou, Z https://escholarship.org/uc/item/2928g9bt ABSTRACT We measure the three-dimensional power spectrum (P3D) of the transmitted flux in the Lyman-$\alpha$ (Ly $\alpha$) forest using the complete extended Baryon Oscillation Spectroscopic Survey data release 16 (eBOSS DR16). This sample consists of $\sim$205 000 quasar spectra in the redshift range $2\le z \le 4$ at an effective redshift $z=2.334$. We propose a pair-count spectral estimator in configuration space, weighting each pair by $\exp (i\mathbf {k}\cdot \mathbf {r})$, for wave vector $\mathbf {k}$ and pixel pair separation $\mathbf {r}$, effectively measuring the anisotropic power spectrum without the need for fast Fourier transforms. This accounts for the window matrix in a tractable way, avoiding artefacts found in Fourier-transform based power spectrum estimators due to the sparse sampling transverse to the line of sight of Ly $\alpha$ skewers. We extensively test our pipeline on two sets of mocks: (i) idealized Gaussian random fields with a sparse sampling of Ly... https://escholarship.org/uc/item/2928g9bt Tue, 12 Nov 2024 00:00:00 +0000 de Belsunce, Roger Philcox, Oliver HE Iršič, Vid McDonald, Patrick https://orcid.org/0000-0001-8346-8394 Guy, Julien https://orcid.org/0000-0001-9822-6793 Palanque-Delabrouille, Nathalie https://escholarship.org/uc/item/0p92q5md The ^{244}Pu(^{50}Ti,xn)^{294-x}Lv reaction was investigated at Lawrence Berkeley National Laboratory's 88-Inch Cyclotron. The experiment was aimed at the production of a superheavy element with Z≥114 by irradiating an actinide target with a beam heavier than ^{48}Ca. Produced Lv ions were separated from the unwanted beam and nuclear reaction products using the Berkeley Gas-filled Separator and implanted into a newly commissioned focal-plane detector system. Two decay chains were observed and assigned to the decay of ^{290}Lv. The production cross section was measured to be σ_{prod}=0.44(_{-0.28}^{+0.58})  pb at a center-of-target center-of-mass energy of 220(3) MeV. This represents the first published measurement of the production of a superheavy element near the "island of stability," with a beam of ^{50}Ti and is an essential precursor in the pursuit of searching for new elements beyond Z=118. https://escholarship.org/uc/item/0p92q5md Tue, 5 Nov 2024 00:00:00 +0000 Gates, JM Orford, R Rudolph, D Appleton, C Barrios, BM Benitez, JY https://orcid.org/0000-0002-4596-1484 Bordeau, M Botha, W Campbell, CM https://orcid.org/0000-0003-3577-4316 Chadderton, J Chemey, AT Clark, RM Crawford, HL https://orcid.org/0000-0002-7765-4235 Despotopulos, JD Dorvaux, O Esker, NE Fallon, P Folden, CM Gall, BJP Garcia, FH Golubev, P Gooding, JA Grebo, M Gregorich, KE Guerrero, M Henderson, RA Herzberg, R-D Hrabar, Y King, TT Covo, M Kireeff Kirkland, AS Krücken, R Leistenschneider, E https://orcid.org/0000-0003-0377-8523 Lykiardopoulou, EM McCarthy, M Mildon, JA Müller-Gatermann, C Phair, L https://orcid.org/0000-0003-0706-5512 Pore, JL https://orcid.org/0000-0003-2653-7597 Rice, E https://orcid.org/0000-0001-5704-7430 Rykaczewski, KP Sammis, BN Sarmiento, LG Seweryniak, D Sharp, DK Sinjari, A Steinegger, P Stoyer, MA Szornel, JM Thomas, K Todd, DS https://orcid.org/0009-0000-6684-8141 Vo, P Watson, V Wooddy, PT https://escholarship.org/uc/item/02b5k6pg Highly multiplexed, fiber-fed spectroscopy is enabling surveys of millions of stars and galaxies. The performance of these surveys depends on accurately positioning fibers in the focal plane to capture target light. We describe a technique to measure the positioning accuracy of fibers by dithering fibers slightly around their ideal locations. This approach also enables measurement of the total system throughput and point-spread function delivered to the focal plane. We then apply this technique to observations from the Dark Energy Survey Instrument (DESI), and demonstrate that DESI positions fibers to within 0.″08 of their targets (5% of a fiber diameter) and achieves a system throughput within about 7% of expectations. https://escholarship.org/uc/item/02b5k6pg Tue, 17 Sep 2024 00:00:00 +0000 Schlafly, EF https://orcid.org/0000-0002-3569-7421 Schlegel, D https://orcid.org/0000-0002-5042-5088 BenZvi, S Raichoor, A https://orcid.org/0000-0001-5999-7923 Forero-Romero, JE Aguilar, J Ahlen, S Bailey, S https://orcid.org/0000-0003-4162-6619 Bault, A Brooks, D Claybaugh, T Dawson, K de la Macorra, A Dey, Arjun Doel, P Gaztañaga, E Gontcho, S Gontcho A Guy, J https://orcid.org/0000-0001-9822-6793 Hahn, C Honscheid, K Jimenez, J Kent, S Kirkby, D https://orcid.org/0000-0002-8828-5463 Kisner, T Kremin, A https://orcid.org/0000-0001-6356-7424 Lambert, A Landriau, M https://orcid.org/0000-0003-1838-8528 Levi, ME https://orcid.org/0000-0003-1887-1018 Manera, M Martini, P Meisner, A Miquel, R Moustakas, J Myers, AD Nie, J Palanque-Delabrouille, N Percival, WJ Poppett, C Prada, F Rabinowitz, D Rezaie, M Rossi, G Sanchez, E Schubnell, M Sharples, R Silber, J https://orcid.org/0000-0002-3461-0320 Tarlé, G Weaver, BA Zhou, Z Zou, H https://escholarship.org/uc/item/9jd644qn Lyman break galaxies (LBGs) are promising probes for clustering measurements at high redshift, z > 2, a region only covered so far by Lyman-α forest measurements. In this paper, we investigate the feasibility of selecting LBGs by exploiting the existence of a strong deficit of flux shortward of the Lyman limit, due to various absorption processes along the line of sight. The target selection relies on deep imaging data from the HSC and CLAUDS surveys in the g, r, z and u bands, respectively, with median depths reaching 27 AB in all bands. The selections were validated by several dedicated spectroscopic observation campaigns with DESI. Visual inspection of spectra has enabled us to develop an automated spectroscopic typing and redshift estimation algorithm specific to LBGs. Based on these data and tools, we assess the efficiency and purity of target selections optimised for different purposes. Selections providing a wide redshift coverage retain 57% of the observed targets after... https://escholarship.org/uc/item/9jd644qn Tue, 10 Sep 2024 00:00:00 +0000 Ruhlmann-Kleider, Vanina Yèche, Christophe Magneville, Christophe Coquinot, Henri Armengaud, Eric Palanque-Delabrouille, Nathalie Raichoor, Anand https://orcid.org/0000-0001-5999-7923 Aguilar, Jessica Nicole Ahlen, Steven Arnouts, Stéphane Brooks, David Chaussidon, Edmond Claybaugh, Todd Dawson, Kyle de la Macorra, Axel Dey, Arjun Dey, Biprateep Doel, Peter Fanning, Kevin Ferraro, Simone https://orcid.org/0000-0003-4992-7854 Forero-Romero, Jaime E Gontcho, Satya Gontcho A Gutierrez, Gaston Gwyn, Stephen Honscheid, Klaus Juneau, Stephanie Kehoe, Robert Kisner, Theodore Kremin, Anthony https://orcid.org/0000-0001-6356-7424 Lambert, Andrew Landriau, Martin https://orcid.org/0000-0003-1838-8528 Le Guillou, Laurent Levi, Michael E https://orcid.org/0000-0003-1887-1018 Manera, Marc Martini, Paul Meisner, Aaron Miquel, Ramon Moustakas, John Mueller, Eva-Maria Muñoz-Gutiérrez, Andrea Newman, Jeffrey A Nie, Jundan Niz, Gustavo Payerne, Constantin Picouet, Vincent Ravoux, Corentin Rezaie, Mehdi Rossi, Graziano Sanchez, Eusebio Sawicki, Marcin Schlafly, Edward F https://orcid.org/0000-0002-3569-7421 Schlegel, David Schubnell, Michael Seo, Hee-Jong Silber, Joseph https://orcid.org/0000-0002-3461-0320 Sprayberry, David Taran, Julien Tarlé, Gregory Weaver, Benjamin A White, Martin https://orcid.org/0000-0001-9912-5070 Wilson, Michael J Zhou, Zhimin Zou, Hu https://escholarship.org/uc/item/9hv8k11n The Dark Energy Spectroscopic Instrument (DESI) completed its 5 month Survey Validation in 2021 May. Spectra of stellar and extragalactic targets from Survey Validation constitute the first major data sample from the DESI survey. This paper describes the public release of those spectra, the catalogs of derived properties, and the intermediate data products. In total, the public release includes good-quality spectral information from 466,447 objects targeted as part of the Milky Way Survey, 428,758 as part of the Bright Galaxy Survey, 227,318 as part of the Luminous Red Galaxy sample, 437,664 as part of the Emission Line Galaxy sample, and 76,079 as part of the Quasar sample. In addition, the release includes spectral information from 137,148 objects that expand the scope beyond the primary samples as part of a series of secondary programs. Here, we describe the spectral data, data quality, data products, Large-Scale Structure science catalogs, access to the data, and references... https://escholarship.org/uc/item/9hv8k11n Tue, 10 Sep 2024 00:00:00 +0000 Collaboration, DESI Adame, AG Aguilar, J Ahlen, S Alam, S Aldering, G Alexander, DM Alfarsy, R Prieto, C Allende Alvarez, M Alves, O Anand, A https://orcid.org/0000-0003-2923-1585 Andrade-Oliveira, F Armengaud, E Asorey, J Avila, S Aviles, A Bailey, S https://orcid.org/0000-0003-4162-6619 Balaguera-Antolínez, A Ballester, O Baltay, C Bault, A Bautista, J Behera, J Beltran, SF BenZvi, S Silva, L Beraldo E Bermejo-Climent, JR Berti, A Besuner, R Beutler, F Bianchi, D Blake, C Blum, R Bolton, AS Brieden, S Brodzeller, A https://orcid.org/0000-0002-8934-0954 Brooks, D Brown, Z Buckley-Geer, E Burtin, E Cabayol-Garcia, L Cai, Z Canning, R Cardiel-Sas, L Rosell, A Carnero Castander, FJ Cervantes-Cota, JL Chabanier, S https://orcid.org/0000-0002-5692-5243 Chaussidon, E Chaves-Montero, J Chen, S Chen, X Chuang, C Claybaugh, T Cole, S Cooper, AP Cuceu, A https://orcid.org/0000-0002-2169-0595 Davis, TM Dawson, K de Belsunce, R de la Cruz, R de la Macorra, A Della Costa, J de Mattia, A Demina, R Demirbozan, U DeRose, J Dey, A Dey, B Dhungana, G Ding, J Ding, Z Doel, P Doshi, R Douglass, K Edge, A Eftekharzadeh, S Eisenstein, DJ Elliott, A Ereza, J Escoffier, S Fagrelius, P Fan, X Fanning, K Fawcett, VA Ferraro, S https://orcid.org/0000-0003-4992-7854 Flaugher, B Font-Ribera, A Forero-Romero, JE Forero-Sánchez, D Frenk, CS Gänsicke, BT García, LÁ García-Bellido, J Garcia-Quintero, C Garrison, LH Gil-Marín, H Golden-Marx, J Gontcho, S Gontcho A https://escholarship.org/uc/item/730113t3 We present a computationally efficient galaxy archetype-based redshift estimation and spectral classification method for the Dark Energy Survey Instrument (DESI) survey. The DESI survey currently relies on a redshift fitter and spectral classifier using a linear combination of principal component analysis–derived templates, which is very efficient in processing large volumes of DESI spectra within a short time frame. However, this method occasionally yields unphysical model fits for galaxies and fails to adequately absorb calibration errors that may still be occasionally visible in the reduced spectra. Our proposed approach improves upon this existing method by refitting the spectra with carefully generated physical galaxy archetypes combined with additional terms designed to absorb data reduction defects and provide more physical models to the DESI spectra. We test our method on an extensive data set derived from the survey validation (SV) and Year 1 (Y1) data of DESI. Our findings... https://escholarship.org/uc/item/730113t3 Tue, 10 Sep 2024 00:00:00 +0000 Anand, Abhijeet https://orcid.org/0000-0003-2923-1585 Guy, Julien https://orcid.org/0000-0001-9822-6793 Bailey, Stephen https://orcid.org/0000-0003-4162-6619 Moustakas, John Aguilar, J Ahlen, S Bolton, AS Brodzeller, A https://orcid.org/0000-0002-8934-0954 Brooks, D Claybaugh, T Cole, S de la Macorra, A Dey, Biprateep Fanning, K Forero-Romero, JE Gaztañaga, E Gontcho, S Gontcho A Gutierrez, G Honscheid, K Howlett, C Juneau, S Kirkby, D https://orcid.org/0000-0002-8828-5463 Kisner, T Kremin, A https://orcid.org/0000-0001-6356-7424 Lambert, A Landriau, M https://orcid.org/0000-0003-1838-8528 Le Guillou, L Manera, M Meisner, A Miquel, R Mueller, E Niz, G Palanque-Delabrouille, N Percival, WJ Poppett, C Prada, F Raichoor, A https://orcid.org/0000-0001-5999-7923 Rezaie, M Rossi, G Sanchez, E Schlafly, EF https://orcid.org/0000-0002-3569-7421 Schlegel, D Schubnell, M Sprayberry, D Tarlé, G Warner, C Weaver, BA Zhou, R https://orcid.org/0000-0001-5381-4372 Zou, H https://escholarship.org/uc/item/0g466899 We measure the clustering of Lyman Alpha Emitting galaxies (LAEs) selected from the One-hundred-square-degree DECam Imaging in Narrowbands (ODIN) survey, with spectroscopic follow-up from Dark Energy Spectroscopic Instrument (DESI). We use DESI spectroscopy to optimize our selection and to constrain the interloper fraction and redshift distribution of our narrow-band selected sources. We select samples of 4000 LAEs at z = 2.45 and 3.1 in 9 sq.deg. centered on the COSMOS field with median Lyα fluxes of ≈ 10-16 erg s-1 cm-2. Covariances and cosmological inferences are obtained from a series of mock catalogs built upon high-resolution N-body simulations that match the footprint, number density, redshift distribution and observed clustering of the sample. We find that both samples have a correlation length of r 0 = 3.0 ± 0.2 h-1 Mpc. Within our fiducial cosmology these correspond to 3D number densities of ≈ 10-3 h3 Mpc-3 and, from our mock catalogs, biases of 1.7 and 2.0 at z = 2.45... https://escholarship.org/uc/item/0g466899 Tue, 10 Sep 2024 00:00:00 +0000 White, Martin https://orcid.org/0000-0001-9912-5070 Raichoor, A https://orcid.org/0000-0001-5999-7923 Dey, Arjun Garrison, Lehman H Gawiser, Eric Lang, D Lee, Kyoung-soo Myers, AD Schlegel, D Valdes, F Aguilar, J Ahlen, S Brooks, D Chaussidon, E Claybaugh, T Dawson, K de la Macorra, A Dey, Biprateep Doel, P Fanning, K Font-Ribera, A Forero-Romero, JE Gontcho, S Gontcho A Gutierrez, G Guy, J https://orcid.org/0000-0001-9822-6793 Honscheid, K Kirkby, D https://orcid.org/0000-0002-8828-5463 Kremin, A https://orcid.org/0000-0001-6356-7424 Landriau, M https://orcid.org/0000-0003-1838-8528 Le Guillou, L Levi, ME https://orcid.org/0000-0003-1887-1018 Magneville, C Manera, M Martini, P Meisner, A Miquel, R Moon, B Newman, JA Niz, G Palanque-Delabrouille, N Park, C Percival, WJ Prada, F Rossi, G Ruhlmann-Kleider, V Sanchez, E Schlafly, EF https://orcid.org/0000-0002-3569-7421 Schubnell, M Seo, H Sprayberry, D Tarlé, G Weaver, BA Yang, Y Yèche, C Zou, H https://escholarship.org/uc/item/9hw4w5rg ABSTRACT The 1D power spectrum P1D of the Ly α forest provides important information about cosmological and astrophysical parameters, including constraints on warm dark matter models, the sum of the masses of the three neutrino species, and the thermal state of the intergalactic medium. We present the first measurement of P1D with the quadratic maximum likelihood estimator (QMLE) from the Dark Energy Spectroscopic Instrument (DESI) survey early data sample. This early sample of 54 600 quasars is already comparable in size to the largest previous studies, and we conduct a thorough investigation of numerous instrumental and analysis systematic errors to evaluate their impact on DESI data with QMLE. We demonstrate the excellent performance of the spectroscopic pipeline noise estimation and the impressive accuracy of the spectrograph resolution matrix with 2D image simulations of raw DESI images that we processed with the DESI spectroscopic pipeline. We also study metal line... https://escholarship.org/uc/item/9hw4w5rg Tue, 20 Aug 2024 00:00:00 +0000 Karaçaylı, Naim Göksel Martini, Paul Guy, Julien https://orcid.org/0000-0001-9822-6793 Ravoux, Corentin Karim, Marie Lynn Abdul Armengaud, Eric Walther, Michael Aguilar, J Ahlen, S Bailey, S https://orcid.org/0000-0003-4162-6619 Bautista, J Beltran, SF Brooks, D Cabayol-Garcia, L Chabanier, S Chaussidon, E Chaves-Montero, J Dawson, K de la Cruz, R de la Macorra, A Doel, P Font-Ribera, A Forero-Romero, JE Gontcho, S Gontcho A Gonzalez-Morales, AX Gordon, C Herrera-Alcantar, HK Honscheid, K Iršič, V Ishak, M Kehoe, R Kisner, T Kremin, A https://orcid.org/0000-0001-6356-7424 Landriau, M https://orcid.org/0000-0003-1838-8528 Le Guillou, L Levi, ME Lukić, Z Meisner, A Miquel, R Moustakas, J Mueller, E Muñoz-Gutiérrez, A Napolitano, L Nie, J Niz, G Palanque-Delabrouille, N Percival, WJ Pieri, M Poppett, C Prada, F Pérez-Ràfols, I Ramírez-Pérez, C Rossi, G Sanchez, E Seo, H Sinigaglia, F Tan, T Tarlé, G Wang, B Weaver, BA Yéche, C Zhou, Z https://escholarship.org/uc/item/5bh0d8zz Laser-driven ion acceleration provides ultrashort, high-charge, low-emittance beams, which are desirable for a wide range of high-impact applications. Yet after decades of research, a significant increase in maximum ion energy is still needed. This paper introduces a quality-preserving staging concept for ultraintense ion bunches that is seamlessly applicable from the nonrelativistic plasma source to the relativistic regime. Full three-dimensional particle-in-cell simulations prove robustness and capture of a high-charge proton bunch, suitable for readily available and near-term laser facilities. Published by the American Physical Society 2024 https://escholarship.org/uc/item/5bh0d8zz Tue, 13 Aug 2024 00:00:00 +0000 Garten, Marco https://orcid.org/0000-0001-6994-2475 Bulanov, Stepan S https://orcid.org/0000-0002-9861-9391 Hakimi, Sahel Obst-Huebl, Lieselotte https://orcid.org/0000-0001-9236-8037 Mitchell, Chad E https://orcid.org/0000-0002-1986-9852 Schroeder, Carl B https://orcid.org/0000-0002-9610-0166 Esarey, Eric Geddes, Cameron GR Vay, Jean-Luc Huebl, Axel https://orcid.org/0000-0003-1943-7141 https://escholarship.org/uc/item/3bn193b1 It is widely accepted that the next lepton collider beyond a Higgs factory would require center-of-mass energy of the order of up to 15 TeV. Since, given reasonable space and cost restrictions, conventional accelerator technology reaches its limits near this energy, high-gradient advanced acceleration concepts are attractive. Advanced and novel accelerators (ANAs) are leading candidates due to their ability to produce acceleration gradients on the order of 1–100 GV/m, leading to compact acceleration facilities. However, intermediate energy facilities (IEF) are required to test the critical technology elements on the way towards multi-TeV-class collliders. Here a science case for a 20–100 GeV center-of-mass energy ANA-based lepton collider that can be a candidate for an intermediate energy facility is presented. The IEF can provide numerous opportunities for high energy physics studies including precision Quantum Chromodynamics and Beyond the Standard Model physics measurements,... https://escholarship.org/uc/item/3bn193b1 Wed, 24 Jul 2024 00:00:00 +0000 Bulanov, SS https://orcid.org/0000-0002-9861-9391 Aidala, CA Benedetti, C https://orcid.org/0000-0003-0408-1103 Bernstein, R Esarey, E Geddes, CGR Gessner, SJ Gonsalves, AJ https://orcid.org/0000-0002-2567-7582 Hogan, MJ Jacobs, PM https://orcid.org/0000-0001-9980-5199 Jing, C Knapen, S Lee, C Low, I Lu, X Meade, P Muggli, P Musumeci, P Nachman, B Nakamura, K https://orcid.org/0000-0001-9842-7114 Nelson, T Griso, S Pagan Palmer, M Prebys, E Schroeder, CB Shiltsev, V Terzani, D https://orcid.org/0000-0002-0105-5420 Thomas, AGR van Tilborg, J Turner, M Vafaei-Najafabadi, N Visinelli, L Yao, W-M Yoshida, R https://escholarship.org/uc/item/05z3m2rj Developments in the description of the masses of atomic nuclei have led to various nuclear mass models that provide predictions for masses across the whole chart of nuclides. These mass models play an important role in understanding the synthesis of heavy elements in the rapid neutron capture (r) process. However, it is still a challenging task to estimate the size of uncertainty associated with the predictions of each mass model. In this work, a method called ensemble Bayesian model averaging (EBMA) is introduced to quantify the uncertainty of one-neutron separation energies (S1n) which are directly relevant in the calculations of r-process observables. This Bayesian method provides a natural way to perform model averaging, selection, and uncertainty quantification, by combining the mass models as a mixture of normal distributions whose parameters are optimized against the experimental data, employing the Markov chain Monte Carlo method using the no-u-turn sampler. The EBMA model... https://escholarship.org/uc/item/05z3m2rj Tue, 21 May 2024 00:00:00 +0000 Saito, Yukiya Dillmann, I Krücken, R Mumpower, MR Surman, R https://escholarship.org/uc/item/2px009hq On December 5, 2022, an indirect drive fusion implosion on the National Ignition Facility (NIF) achieved a target gain G_{target} of 1.5. This is the first laboratory demonstration of exceeding "scientific breakeven" (or G_{target}>1) where 2.05 MJ of 351 nm laser light produced 3.1 MJ of total fusion yield, a result which significantly exceeds the Lawson criterion for fusion ignition as reported in a previous NIF implosion [H. Abu-Shawareb et al. (Indirect Drive ICF Collaboration), Phys. Rev. Lett. 129, 075001 (2022)PRLTAO0031-900710.1103/PhysRevLett.129.075001]. This achievement is the culmination of more than five decades of research and gives proof that laboratory fusion, based on fundamental physics principles, is possible. This Letter reports on the target, laser, design, and experimental advancements that led to this result. https://escholarship.org/uc/item/2px009hq Thu, 29 Feb 2024 00:00:00 +0000 Abu-Shawareb, H Acree, R Adams, P Adams, J Addis, B Aden, R Adrian, P Afeyan, BB Aggleton, M Aghaian, L Aguirre, A Aikens, D Akre, J Albert, F Albrecht, M Albright, BJ Albritton, J Alcala, J Alday, C Alessi, DA Alexander, N Alfonso, J Alfonso, N Alger, E Ali, SJ Ali, ZA Allen, A Alley, WE Amala, P Amendt, PA Amick, P Ammula, S Amorin, C Ampleford, DJ Anderson, RW Anklam, T Antipa, N Appelbe, B Aracne-Ruddle, C Araya, E Archuleta, TN Arend, M Arnold, P Arnold, T Arsenlis, A Asay, J Atherton, LJ Atkinson, D Atkinson, R Auerbach, JM Austin, B Auyang, L Awwal, AAS Aybar, N Ayers, J Ayers, S Ayers, T Azevedo, S Bachmann, B Back, CA Bae, J Bailey, DS Bailey, J Baisden, T Baker, KL Baldis, H Barber, D Barberis, M Barker, D Barnes, A Barnes, CW Barrios, MA Barty, C Bass, I Batha, SH Baxamusa, SH Bazan, G Beagle, JK Beale, R Beck, BR Beck, JB Bedzyk, M Beeler, RG Beeler, RG Behrendt, W Belk, L Bell, P Belyaev, M Benage, JF Bennett, G Benedetti, LR Benedict, LX Berger, RL Bernat, T Bernstein, LA Berry, B Bertolini, L Besenbruch, G Betcher, J Bettenhausen, R