Sub-MeV Self Interacting Dark Matter

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 $\Lambda$CDM. 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 cm${}^2$/g. Severe constraints from the BBN on $N_{eff}$ require that the dark and visible sector are not in thermal equilibrium during freeze-out. The effect of this temperature asymmetry is studied.

Lyman Alpha constraints addressed; conclusions unchanged; to appear in Phys. Rev. D

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Cited by in corpus (6)

• Phenomenology of Self-Interacting Dark Matter in a Matter-Dominated Universe
• Signature of light sterile neutrinos at IceCube
• Low-Temperature Enhancement of Semi-annihilation and the AMS-02 Positron Anomaly
• Dark Matter perspective of Left-Right symmetric gauge model
• Resonant Assisted Annihilation
• MeV scale model of SIMP dark matter, neutrino mass and leptogenesis