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- Title
Sterile neutrino dark matter: relativistic freeze-out.
- Authors
Lebedev, Oleg; Toma, Takashi
- Abstract
Long-lived sterile neutrinos can play the role of dark matter. We consider the possibility that such neutrinos form a thermal bath with a singlet scalar, while not being in thermal equilibrium with the Standard Model fields. Eventually, the neutrino dark matter undergoes freeze-out in the dark sector, which can occur in both non-relativistic and relativistic regimes. To account for the latter possibility, we use the full Fermi-Dirac and Bose-Einstein distribution functions with effective chemical potential in the reaction rate computation. This allows us to study the freeze-out process in detail and also obtain the necessary thermalization conditions. We find that relativistic freeze-out occurs in a relatively small part of the parameter space. In contrast to the standard weakly-interacting-massive-particle (WIMP) scenario, the allowed dark matter masses extend to 104 TeV without conflicting perturbativity.
- Subjects
STERILE neutrinos; EINSTEIN, Albert, 1879-1955; DARK matter; WEAKLY interacting massive particles; BOSE Corp.; FERMI-Dirac distribution; CHEMICAL kinetics; THERMAL equilibrium; NEUTRINOS
- Publication
Journal of High Energy Physics, 2023, Vol 2023, Issue 5, p1
- ISSN
1126-6708
- Publication type
Article
- DOI
10.1007/JHEP05(2023)108