Domain of thermal dark matter candidates
Open Access
- 14 September 2021
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review D
- Vol. 104 (5), 055021
- https://doi.org/10.1103/physrevd.104.055021
Abstract
We consider, in general terms, the possible parameter space of thermal dark matter candidates. We assume that the dark matter particle is fundamental and was in thermal equilibrium in a hidden sector with a temperature , which may differ from that of the Standard Model temperature, . The candidates lie in a region in the vs. plane, which is bounded by both model-independent theoretical considerations and observational constraints. The former consists of limits from dark matter candidates that decoupled when relativistic (the relativistic floor) and from those that decoupled when nonrelativistic with the largest annihilation cross section allowed by unitarity (the unitarity wall), while the latter concerns big bang nucleosynthesis ( ceiling) and free streaming. We present three simplified dark matter scenarios, demonstrating concretely how each fits into the domain.
Keywords
Funding Information
- Fonds De La Recherche Scientifique - FNRS (30820817—be.h, 4.4503.15)
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