Dark Matter and the Baryon Asymmetry of the Universe

TL;DR

This work presents a mechanism to generate the baryon asymmetry of the Universe which preserves the net baryons number created in the big bang and naturally explains the observed OmegaDM approximately 5Omegab.

Abstract

We present a mechanism to generate the baryon asymmetry of the Universe which preserves the net baryon number created in the Big Bang. If dark matter particles carry baryon number $B_X$, and $σ^{\rm annih}_{\bar{X}} < σ^{\rm annih}_{X} $, the $\bar{X}$'s freeze out at a higher temperature and have a larger relic density than $X$'s. If $m_X \lsi 4.5 B_X $GeV and the annihilation cross sections differ by $\gsi 10%$, this type of scenario naturally explains the observed $Ω_{DM} \approx 5 Ω_b$.