Lower mass bounds on FIMP dark matter produced via freeze-in

被引：57

作者：

D'Eramo, Francesco ^{[1
,2
]}

Lenoci, Alessandro ^{[1
,2
,3
]}

机构：

[1] Univ Padua, Dipartimento Fis & Astron, Via Marzolo 8, I-35131 Padua, Italy

[2] Inst Nazl Fis Nucl INFN, Sez Padova, Via Marzolo 8, I-35131 Padua, Italy

[3] DESY, Notkestr 85, D-22607 Hamburg, Germany

来源：

JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS | 2021年 / 10期

基金：

欧盟地平线“2020”;

关键词：

dark matter theory; particle physics-cosmology connection; power spectrum; Lyman alpha forest; COLD; CANDIDATES; MILKY; BIG;

D O I：

10.1088/1475-7516/2021/10/045

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Feebly Interacting Massive Particles (FIMPs) are dark matter candidates that never thermalize in the early universe and whose production takes place via decays and/or scatterings of thermal bath particles. If FIMPs interactions with the thermal bath are renormalizable, a scenario which is known as freeze-in, production is most efficient at temperatures around the mass of the bath particles and insensitive to unknown physics at high temperatures. Working in a model-independent fashion, we consider three different production mechanisms: two-body decays, three-body decays, and binary collisions. We compute the FIMP phase space distribution and matter power spectrum, and we investigate the suppression of cosmological structures at small scales. Our results are lower bounds on the FIMP mass. Finally, we study how to relax these constraints in scenarios where FIMPs provide a sub-dominant dark matter component.

引用

页数：51

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