Strong Bound on Canonical Ultralight Axion Dark Matter from the Lyman-Alpha Forest

被引：218

作者：

Rogers, Keir K. ^{[1
]}

Peiris, Hiranya, V ^{[1
,2
]}

机构：

[1] Stockholm Univ, AlbaNova Univ Ctr, Oskar Klein Ctr Cosmoparticle Phys, Dept Phys, S-10691 Stockholm, Sweden

[2] UCL, Dept Phys & Astron, Gower St, London WC1E 6BT, England

来源：

PHYSICAL REVIEW LETTERS | 2021年 / 126卷 / 07期

基金：

美国国家科学基金会; 瑞典研究理事会; 英国科学技术设施理事会; 英国科研创新办公室;

关键词：

POWER SPECTRUM; REIONIZATION; CODE; MASS;

D O I：

10.1103/PhysRevLett.126.071302

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We present a new bound on the ultralight axion (ULA) dark matter mass m(a), using the Lyman-alpha forest to look for suppressed cosmic structure growth: a 95% lower limit m(a) > 2 x 10(-20) eV. This strongly disfavors (>99.7% credibility) the canonical ULA with 10(-22) eV < m(a) < 10(-21) eV, motivated by the string axiverse and solutions to possible tensions in the cold dark matter model. We strengthen previous equivalent bounds by about an order of magnitude. We demonstrate the robustness of our results using an optimized emulator of improved hydrodynamical simulations.

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