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Title: | Sub-MeV Self Interacting Dark Matter |
Authors: | Chauhan, Bhavesh |
Keywords: | Physics Cosmology: Theory Gravitation Astrophysics - Cosmology |
Issue Date: | Jun-2018 |
Publisher: | APS |
Abstract: | In this paper, we present a model for sub-MeV dark matter with strong self-interactions which can solve some of the small-scale crisis of the ΛCDM. The dark matter is a Majorana fermion with only off-diagonal interactions with a hidden 𝑈(1)𝐷 gauge boson. The relic density is obtained by freeze-out of Boltzmann suppressed annihilations to a light fermionic species. The self-interaction is a one-loop process and constrained to be between 0.1 to 1 cm2/g. Severe constraints from the BBN on 𝑁eff require that the dark and visible sector are not in thermal equilibrium during freeze-out. The effect of this temperature asymmetry is studied. |
URI: | https://journals.aps.org/prd/abstract/10.1103/PhysRevD.97.123017 http://dspace.bits-pilani.ac.in:8080/jspui/xmlui/handle/123456789/15287 |
Appears in Collections: | Department of Physics |
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