期刊
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
卷 -, 期 10, 页码 -出版社
IOP Publishing Ltd
DOI: 10.1088/1475-7516/2021/10/045
关键词
dark matter theory; particle physics-cosmology connection; power spectrum; Lyman alpha forest
资金
- Ministero dell'Istruzione, Universita e della Ricerca (MIUR) [2017X7X85K]
- New Theoretical Tools for Axion Cosmology under the Supporting TAlent in ReSearch@University of Padova (STARS@UNIPD)
- New Theoretical Tools to Look at the Invisible Universe - University of Padua
- Istituto Nazionale di Fisica Nucleare (INFN) through the Theoretical Astroparticle Physics (TAsP) project
- European Union's Horizon 2020 research and innovation programme under the Marie Sklodowska-Curie grant [860881-HIDDeN]
- Deutsche Forschungsgemeinschaft [EXC 2121, 390833306]
In this study, different production mechanisms of FIMPs were considered, including decays and collisions. The FIMP phase space distribution and matter power spectrum were computed to investigate the suppression of cosmological structures, showing lower bounds on the FIMP mass. Additionally, constraints were relaxed in scenarios where FIMPs provide a sub-dominant dark matter component.
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.
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