Aaron Meisner, Aaron Roodman, Abhishek Prakash, Adam Myers, Adam S. Bolton, Alexandre Refregier, Alex G. Kim, Alex Smith, Alistair R. Walker, Anand Raichoor, Andrea Kueter-Young, Andreu Font-Ribera, Andrew Lambert, Andrew P. Cooper, Andrina Nicola, Andy Stefanik, Angela Burden, Anna Patej, Anne Ealet, Ann Elliott, Anthony Kremin, Antonella Palmese, Anze Slosar, Arjun Dey, Arman Shafieloo, Armin Karcher, Arya Farahi, Ashley J. Ross, Auguste Le Van Suu, Aur\'elia Secroun, Axel de la Macorra, Baojiu Li, Benjamin A. Weaver, Benjamin L'Huillier, Beth Reid, Boris T. Gaensicke, Brenna Flaugher, Brian Nord, Carlos Allende Prieto, Carlos S. Frenk, Carl T. Coker, Cedric G. Lacey, Cesar Briceno, Changbom Park, Chang Hee Ree, Charles Baltay, Chris Bebek, Chris Blake, Christophe Balland, Christophe Magneville, Christopher J. Manser, Christophe Yeche, Claire Poppett, Constance M. Rockosi, Cristiano Sabiu, Cristobal Padilla, Curtis Weaverdyck, Daniela Leitner, Daniel J. Eisenstein, Daniel Pappalardo, Daniel P. Cunningham, Dara Norman, David A. Herrera, David Brooks, David H. Weinberg, David J. Schlegel, David Kirkby, David Rabinowitz, David R. Silva, David Sprayberry, Debopam Som, Denis Gillet, DESI Collaboration: Amir Aghamousa, Dianna Jacobs, Douglas P. Finkbeiner, Dragan Huterer, Dustin Lang, Eduardo Rozo, Elise Jennings, Eli S. Rykoff, Elizabeth Buckley-Geer, Ellie Kitanidis, Enrique Fernandez, Enrique Gaztanaga, Eric F. Bell, Eric Huff, Eric Jullo, Eric Linder, Etienne Burtin, Eusebio Sanchez, Eve Kovacs, Florian Beutler, Francisco J. Castander, Francisco Prada, Francisco Valdes, Gaston Gutierrez, George F. Smoot, Ginevra Favole, Giuseppe Gallo, Gong-Bo Zhao, Govinda Dhungana, Graziano Rossi, Gregory Tarle, Guillermo Gonzalez-de-Rivera, Gustavo Niz, Hamsa Padmanabhan, Hannes Bleuler, Hee-Jong Seo, Henry Heetderks, Hiranya V. Peiris, Ho Seong Hwang, Huan Lin, Huanyuan Shan, Hu Zou, Ian D. McGreer, Ian Heetderks, Irena Gershkovich, Isabelle P\^aris, Jae Hyeon Lee, Jaime E. Forero-Romero, James Annis, Javier Sanchez, Jay Farihi, Jean-Gabriel Cuby, Jean-Marc Le Goff, Jean-Paul Kneib, Jeffrey A. Newman, Jennifer E. Pollack, Jennifer Johnson, Jeremy L. Tinker, Jeremy McCauley, Jerry Edelstein, Jessica Aguilar, Jiali Wang, Joel R. Brownstein, Johan Comparat, John A. Peacock, John Moustakas, Jorge Jimenez, Jorge L. Cervantes-Cota, Jos\'e Luis Bernal, Joseph H. Silber, Joseph Maria Illa Laguna, Joseph R. Findlay, Juan De Vicente, Juan Garcia-Bellido, Julien Guy, Jundan Nie, Jun Ma, Katrin Heitmann, Kazuya Koyama, Kevin Fanning, Kevin Reil, Klaus Honscheid, Knut A. G. Olsen, Kyle S. Dawson, Lado Samushia, Laia Cardiel-Sas, Laleh Makarem, Laurent Le Guillou, Licia Verde, Linhua Jiang, Lori E. Allen, Lucas Beaufore, Luiz Nicolati da Costa, Luzius Kronig, Madeline Close, Marc Manera, Mariana Vargas-Magana, Mark Derwent, Martin Crocce, Martin Kilbinger, Martin Landriau, Martin M. Sirk, Martin White, Matthew Evatt, Matthew M. Pieri, M.-C. Cousinou, Mehdi Rezaie, Michael Blomqvist, Michael E. Levi, Michael J. Fitzpatrick, Michael J. Sholl, Michael Lampton, Michael Lesser, Michael Schneider, Michael Schubnell, Michele Fumagalli, Milind Naik, Ming Liang, Minji Oh, Monica Valluri, Natalie Roe, Nathalie Palanque-Delabrouille, Niall Jeffrey, Niall MacCrann, Nicholas P. Ross, Nicola Pietro Gentile Fusillo, Nicolas G. Busca, Nigel Metcalfe, Nikhil Padmanabhan, Noble Kennamer, Octavio Valenzuela, Ofer Lahav, Or Graur, Otger Ballester, Pablo Fosalba, Parker Fagrelius, Patrick Jelinsky, Patrick McDonald, Paul Martini, Peder Norberg, Peter Doel, Peter Nugent, Pierre-Henri Carton, Qian Yang, Ramon Miquel, Raymond G. Carlberg, Ray Sharples, Ricard Casas, Richard Joyce, Richard Kron, Richard Massey, Richard Pogge, Risa H. Wechsler, Rita Tojeiro, Robert Besuner, Robert Blum, Robert C. Nichol, Robert Kehoe, Robert Marshall, Robert N. Cahn, Robin Lafever, Ronald G. Probst, Ryan Staten, Salman Habib, Sami Kama, Samuel Flender, Samuel Ronayette, Sandrine Perruchot, Santiago Serrano, Sarah Eftekharzadeh, Sarah R. Loebman, Sergey Koposov, Shadab Alam, Shaun Cole, Shelby Gott, Shirley Ho, Sonia Karkar, St\'ephanie Escoffier, St\'ephanie Juneau, Stephen Bailey, Stephen Holland, Stephen Kent, Steve Ahlen, Su-Jeong Lee, Suk Sien Tie, Tamara M. Davis, Terry Gerard, Theodore Kisner, Thomas Matheson, Thomas O'Brien, Tianmeng Zhang, Timoth\'ee Delubac, Timothy A. Hutchinson, Timothy C. Beers, Timothy N. Miller, Todd M. Claybaugh, Tod R. Lauer, Tommaso Giannantonio, Uros Seljak, Vanina Ruhlmann-Kleider, Violeta Gonzalez-Perez, William V. Shourt, Will J. Percival, Wojciech A. Hellwing, Xavier Regal, Xiaohui Fan, Xiyan Peng, Xu Zhou, Yaling Zhu, Yan-Chuan Cai, Ying Zu, Yi Zheng, Yong-Seon Song, Yu Feng, Yuting Wang, Yutong T. Duan, Yuzo Ishikawa, Zarija Luki\'c, Zhejie Ding, Zhimin Zhou
DESI (Dark Energy Spectropic Instrument) is a Stage IV ground-based dark energy experiment that will study baryon acoustic oscillations and the growth of structure through redshift-space distortions with a wide-area galaxy and quasar redshift survey. The DESI instrument is a robotically-actuated, fiber-fed spectrograph capable of taking up to 5,000 simultaneous spectra over a wavelength range from 360 nm to 980 nm. The fibers feed ten three-arm spectrographs with resolution $R= \lambda/\Delta\lambda$ between 2000 and 5500, depending on wavelength. The DESI instrument will be used to conduct a five-year survey designed to cover 14,000 deg$^2$. This powerful instrument will be installed at prime focus on the 4-m Mayall telescope in Kitt Peak, Arizona, along with a new optical corrector, which will provide a three-degree diameter field of view. The DESI collaboration will also deliver a spectroscopic pipeline and data management system to reduce and archive all data for eventual public use.
High-significance kSZ detections for BGS and ELG tracers reveal low gas fractions near virial radii in BGS halos likely due to AGN feedback and higher gas fractions in ELG halos suggesting weaker feedback.
A large DESI sample reveals thousands of infalling cold gas absorbers at low redshift, with velocity distributions indicating multiple accretion pathways including radial inflows and satellite accretion.
DESI DR2 and ACT DR6 data yield 17σ LRG-velocity, 8.3σ ELG-velocity, and 6.8σ QSO-velocity detections plus a 3.1σ velocity-velocity signal, producing f_NL^loc = 15.9_{-34.4}^{+34.6} from the velocity field.
DESI DR2 BAO data exhibits 2.3 sigma tension with CMB in Lambda-CDM but prefers evolving dark energy (w0 > -1, wa < 0) at 3.1 sigma with CMB and 2.8-4.2 sigma when including supernovae.
High-significance kSZ measurements around LRGs show gas is redistributed beyond gravitational collapse and imply more efficient feedback in group-scale halos than in standard hydrodynamical models.
No kilonova detected from sub-solar GW candidate S251112cm, but coincident IIb supernova SN 2025adtq yields suggestive evidence for the superkilonova channel, though inconclusive after accounting for chance coincidence.
A catalogue of 62 million galaxy shapes from 3500 sq deg of UNIONS r-band imaging achieves an effective source density of 4.96 arcmin^{-2} and shape noise of 0.27 after PSF calibration and validation.
MUST is a new 6.5 m telescope designed to deliver simultaneous optical spectra for over 20,000 targets across a 5 deg² field, enabling the largest 3D spectroscopic map of the Universe with redshifts for more than 100 ...
Extended analysis of DESI DR2 data confirms robust evidence for dynamical dark energy with phantom crossing preference, stable under parametric and non-parametric modeling.
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