Baryogenesis from dark matter

TL;DR

This paper explores a novel baryogenesis mechanism where primordial fields decay into dark matter, creating an asymmetry that is transferred to baryons and leptons, resulting in multi-component dark matter and baryon asymmetry.

Contribution

It introduces a new model linking dark matter asymmetry generation to baryogenesis through primordial field decays and asymmetry transfer, including symmetric component annihilation.

Findings

Dark matter asymmetry generated from primordial decay with CP violation.

Transfer of dark matter asymmetry to baryons via asymmetry transfer equations.

Model predicts multi-component dark matter with bosonic and fermionic parts.

Abstract

We consider the possibility that some primordial fields decay purely into the dark sector creating asymmetric dark matter. This asymmetry is subsequently transmuted into leptons and baryons. Within this paradigm we compute the amount of asymmetric dark matter created from the out of equilibrium decays of the primordial fields with CP violating Yukawa couplings. The dark matter asymmetry is then transferred to the visible sector by the asymmetry transfer equation and generates an excess of $B-L$. Baryogenesis occurs via sphaleron processes which conserve $B-L$ but violate $B+L$. A mechanism for the annihilation of the symmetric component of dark matter is also discussed. The model leads to multi-component dark matter consisting of both bosonic and fermionic components.