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Author Chauhan, Bhavesh
Source IIT Gandhinagar
Content type Text
Publisher Cornell University Library
Language English
Abstract In this paper, we present a model for sub-MeV dark matter with strong self interactions which cansolve some of the small scale crisis of the ΛCDM. The dark matter is a Majorana fermion with only off-diagonal interactions with a hiddenU(1)Dgauge boson. The relic density is obtained by freeze-out ofBoltzmann suppressed annihilations to a light fermionic species. The self interaction is a one loop processand constrained to be between 0.1 to 1 cm2/g. Severe constraints from the BBN onNeffrequire that thedark and visible sector are not in thermal equilibrium during freeze-out. The effect of this temperatureasymmetry is studied.
Description This is a Preprint version
Learning Resource Type Article
Publisher Date 2017-11-01