利用DES-Y1与外部数据约束晚期宇宙中暗物质到暗辐射的转化
宇宙学与河外天体物理
2022-09-28 v5 高能物理 - 唯象学
摘要
我们研究了一类现象学模型,其中暗物质在低红移时期转化为暗辐射。这类被称为DMDR的模型通过两个额外参数刻画共动暗物质密度的演化,并可能有助于缓解宇宙早期与晚期探测之间观测到的差异。我们考察了该转化如何影响诸如CMB温度与物质功率谱等关键宇宙学可观测量。结合暗能量巡天(Dark Energy Survey)第一年的3x2pt数据、{\it Planck}-2018 CMB温度与偏振数据、来自Pantheon的Ia型超新星(SN)数据,以及来自BOSS DR12、MGS和6dFGS的重子声学振荡(BAO)数据,我们对已转化为暗辐射的暗物质总量及其转化速率给出了新的约束。以当前暗物质数量为单位,自宇宙开端以来已转化的暗物质比例在68%置信水平下被约束为:DES-Y1 3x2pt数据下,CMB+SN+BAO数据下,合并数据集下。DES与CMB+SN+BAO数据集一致的概率从CDM模型的4%增加到DMDR的8%(张力较小)。DES-Y1 3x2pt与CMB+SN+BAO之间的张力从略微降低到。当合并数据与距离阶梯测量在DMDR模型中比较时,我们发现Hubble张力未减小。DMDR与CDM模型的最大后验拟合优度统计量相当,表明相对于CDM,并不偏好DMDR宇宙学。
引用
@article{arxiv.2011.04606,
title = {Constraints on dark matter to dark radiation conversion in the late universe with DES-Y1 and external data},
author = {Angela Chen and Dragan Huterer and Sujeong Lee and Agnès Ferté and Noah Weaverdyck and Otavio Alonso Alves and C. Danielle Leonard and Niall MacCrann and Marco Raveri and Anna Porredon and Eleonora Di Valentino and Jessica Muir and Pablo Lemos and Andrew Liddle and Jonathan Blazek and Andresa Campos and Ross Cawthon and Ami Choi and Scott Dodelson and Jack Elvin-Poole and Daniel Gruen and Ashley Ross and Lucas F. Secco and Ignacio Sevilla and Erin Sheldon and Michael A. Troxel and Joe Zuntz and Tim Abbott and Michel Aguena and Sahar Allam and James Annis and Santiago Avila and Emmanuel Bertin and Sunayana Bhargava and Sarah Bridle and David Brooks and Aurelio Carnero Rosell and Matias Carrasco Kind and Jorge Carretero and Matteo Costanzi and Martin Crocce and Luiz da Costa and Maria Elidaiana da Silva Pereira and Tamara Davis and Peter Doel and Tim Eifler and Ismael Ferrero and Pablo Fosalba and Josh Frieman and Juan Garcia-Bellido and Enrique Gaztanaga and David Gerdes and Robert Gruendl and Julia Gschwend and Gaston Gutierrez and Samuel Hinton and Devon L. Hollowood and Klaus Honscheid and Ben Hoyle and David James and Mike Jarvis and Kyler Kuehn and Ofer Lahav and Marcio Maia and Jennifer Marshall and Felipe Menanteau and Ramon Miquel and Robert Morgan and Antonella Palmese and Francisco Paz-Chinchon and Andrés Plazas Malagón and Aaron Roodman and Eusebio Sanchez and Vic Scarpine and Michael Schubnell and Santiago Serrano and Mathew Smith and Eric Suchyta and Gregory Tarle and Daniel Thomas and Chun-Hao To and Tamas Norbert Varga and Jochen Weller and Reese Wilkinson},
journal= {arXiv preprint arXiv:2011.04606},
year = {2022}
}
备注
23 pages, 11 figures. DES extensions group. Accepted by PRD