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.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据