利用 DESI DR2 BAO 和 DR1 全形状约束中微子物理
摘要
暗能量光谱仪器（DESI）合作组基于 Lyα 森林和星系，在红移范围 0.1 < z < 4.2 内获得了重子声波振荡（BAO）的稳健测量。我们将这些测量与 Planck 和 ACT 的外部宇宙微波背景（CMB）数据相结合，对中微子总质量施加了迄今为止最严格的约束。假设宇宙学 ΛCDM 模型和三个简并中微子态，我们得到 Σm_ν < 0.0642 eV（95%），边缘化误差为 σ(Σm_ν) = 0.020 eV。我们还约束了有效中微子种数，得到 N_eff = 3.23^{+0.35}_{-0.34}（95%），与标准模型预测一致。考虑中微子振荡约束后，我们发现倾向于正常质量排序，且最轻中微子质量的上限为 m_l < 0.023 eV（95%）。然而，我们使用频率学派和贝叶斯方法确定，我们的约束与中微子振荡得出的下限存在张力。通过修正零质量的物理边界，我们报告了 95% Feldman-Cousins 上限 Σm_ν < 0.053 eV，突破了中微子振荡的下限。考虑更一般的贝叶斯分析，使用有效宇宙学中微子质量参数 Σm_{ν,eff}，允许负能量密度并消除不满意的先验权重效应，我们得出的约束与同一振荡极限存在 3σ 张力。在未知系统误差不存在的情况下，这一发现可能被解释为新物理的暗示，而不一定与中微子有关。DESI 和 CMB 数据对演化暗能量模型的偏好提供了一种可能的解决方案。在 w₀wₐCDM 模型中，我们得到 Σm_ν < 0.163 eV（95%），缓解了中微子张力。[摘要]
引用
@article{arxiv.2503.14744,
title = {Constraints on Neutrino Physics from DESI DR2 BAO and DR1 Full Shape},
author = {W. Elbers and A. Aviles and H. E. Noriega and D. Chebat and A. Menegas and C. S. Frenk and C. Garcia-Quintero and D. Gonzalez and M. Ishak and O. Lahav and K. Naidoo and G. Niz and C. Yèche and M. Abdul-Karim and S. Ahlen and O. Alves and U. Andrade and E. Armengaud and J. Behera and S. BenZvi and D. Bianchi and S. Brieden and A. Brodzeller and D. Brooks and E. Burtin and R. Calderon and R. Canning and A. Carnero Rosell and L. Casas and F. J. Castander and M. Charles and E. Chaussidon and J. Chaves-Montero and T. Claybaugh and S. Cole and A. P. Cooper and A. Cuceu and K. S. Dawson and A. de la Macorra and A. de Mattia and N. Deiosso and A. Dey and B. Dey and Z. Ding and P. Doel and D. J. Eisenstein and S. Ferraro and A. Font-Ribera and J. E. Forero-Romero and L. H. Garrison and E. Gaztañaga and H. Gil-Marín and S. Gontcho A Gontcho and A. X. Gonzalez-Morales and G. Gutierrez and S. He and M. Herbold and H. K. Herrera-Alcantar and C. Howlett and D. Huterer and S. Juneau and R. Kehoe and D. Kirkby and T. Kisner and A. Kremin and C. Lamman and M. Landriau and L. Le Guillou and A. Leauthaud and M. E. Levi and Q. Li and K. Lodha and C. Magneville and M. Manera and P. Martini and W. L. Matthewson and A. Meisner and J. Mena-Fernández and R. Miquel and J. Moustakas and S. Nadathur and J. A. Newman and E. Paillas and N. Palanque-Delabrouille and W. J. Percival and M. M. Pieri and C. Poppett and F. Prada and I. Pérez-Ràfols and D. Rabinowitz and C. Ramírez-Pérez and M. Rashkovetskyi and C. Ravoux and H. Rivera-Morales and J. Rohlf and A. J. Ross and G. Rossi and V. Ruhlmann-Kleider and L. Samushia and E. Sanchez and D. Schlegel and M. Schubnell and H. Seo and F. Sinigaglia and D. Sprayberry and T. Tan and G. Tarlé and P. Taylor and W. Turner and M. Vargas-Magaña and L. Verde and M. Walther and B. A. Weaver and A. Whitford and M. Wolfson and P. Zarrouk and C. Zhao and R. Zhou and H. Zou},
journal= {arXiv preprint arXiv:2503.14744},
year = {2025}
}
备注
Accepted for publication in PRD. 34 pages, 17 figures. This DESI Collaboration Publication is part of the Data Release 2 publication series (see https://data.desi.lbl.gov/doc/papers/)