Constraints on neutrino physics from DESI DR2 BAO and DR1 full shape

作者：Willem Elbers, Alejandro Avilés, H. E. Noriega, D. Chebat, A. Menegas, Carlos S. Frenk, C. García-Quintero, D. Gonzalez, Mustapha Ishak, O. Lahav, Krishna Naidoo, Gustavo Niz, C. Yèche, M. Abdul-Karim, S. P. Ahlen, O. Alves, U. Andrade, E. Armengaud, J. Behera, S. BenZvi, D. Bianchi, S. Brieden, A. Brodzeller, D. Brooks, E. Burtin, R. Calderón, R. E. A. Canning, A. Carnero Rosell, Lidia Casas, F. J. Castander, M. Charles, E. Chaussidon, J. Chaves-Montero, T. Claybaugh, S. Cole, Andrew P. Cooper, Andrei Cuceu, Kyle Dawson, Axel de la Macorra, Arnaud de Mattia, N. Deiosso, Arjun Dey, Biprateep Dey, Z. Ding, Peter Doel, D. J. Eisenstein, Simone Ferraro, Andreu Font-Ribera, J. E. Forero-Romero, L. H. Garrison, E. Gaztañaga, Héctor Gil-Marín, Satya Gontcho A Gontcho, Alma X. González‐Morales, G. Gutiérrez, S. He, M. Herbold, H. K. Herrera-Alcantar, Cullan Howlett, Dragan Huterer, S. Juneau, R. Kehoe, D. Kirkby, Theodore Kisner, A. Kremin, C. Lamman, Martin Landriau, L. Le Guillou, Alexie Leauthaud, M. E. Levi, Qiong Li, K. Lodha, C. Magneville, Marc Manera, P. Martini, William L. Matthewson, Aaron Meisner, J. Mena-Fernández, R. Miquel, John Moustakas, S. Nadathur, Jeffrey A. Newman, E. Paillas, N. Palanque‐Delabrouille, Will J. Percival, Matthew M. Pieri, C. Poppett, F. Prada, Ignasi Pérez-Ràfols, D. Rabinowitz, C. Ramírez-Pérez, M. Rashkovetskyi, C. Ravoux, H. Rivera-Morales, J. Rohlf, Ashley J. Ross, Graziano Rossi, V. Ruhlmann-Kleider, Lado Samushia, E. Sánchez, David J. Schlegel, M. Schubnell, Hee‐Jong Seo, Francesco Sinigaglia, D. Sprayberry, T. Tan, G. Tarlé, Peter L. Taylor, W. Turner, M. Vargas-Magaña, Licia Verde, Michael Walther, B. A. Weaver, Abbé M Whitford, Molly Wolfson, Pauline Zarrouk, Cheng Zhao, Rongpu Zhou, Hu Zou · 发表于：Physical review. D/Physical review. D. · 年份：2025 · DOI：10.1103/w9pk-xsk7 · 被引用次数：66 · 研究领域：Astrophysics and Cosmic Phenomena、Neutrino Physics Research、Cosmology and Gravitation Theories

The Dark Energy Spectroscopic Instrument (DESI) Collaboration has obtained robust measurements of baryon acoustic oscillations in the redshift range 0.1 < z < 4.2 , based on the Lyman- α 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 Λ CDM model and three degenerate neutrino states, we find ∑ m ν < 0.0642 eV (95%) with a marginalized error of σ ( ∑ m ν ) = 0.020 eV . We also constrain the effective number of neutrino species, finding N eff = 3.2 3 − 0.34 + 0.35 (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 m l < 0.023 eV (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 at zero mass, we report a 95% Feldman-Cousins upper limit of ∑ m ν < 0.053 eV , breaching the lower limit from neutrino oscillations. Considering a more general Bayesian analysis with an effective cosmological ne...