A WIMPy Baryogenesis Miracle

TL;DR

This paper introduces WIMPy baryogenesis, a novel mechanism linking weakly interacting massive particle (WIMP) dark matter annihilation directly to baryogenesis, naturally explaining dark matter abundance and baryon asymmetry at the weak scale.

Contribution

The paper proposes the concept of WIMPy baryogenesis, connecting dark matter annihilation to baryogenesis with models that operate at TeV-scale masses and couplings, avoiding high reheat temperature issues.

Findings

Models naturally accommodate weak-scale dark matter and baryon asymmetry.

Some models predict observable signals in ongoing and future experiments.

Extension of the WIMP miracle explains both dark matter abundance and baryon asymmetry.

Abstract

We explore models in which weakly interacting massive particle (WIMP) dark matter annihilation is directly responsible for baryogenesis, thereby connecting dark matter with baryogenesis. We call this process "WIMPy baryogenesis". The dark matter relic density in these models, as with conventional WIMP models, is obtained with only order one couplings and TeV-scale masses according to the WIMP miracle. Thus, WIMPy baryogenesis models naturally accommodate weak-scale dark matter. Furthermore, an extension of the WIMP miracle simultaneously explains the observed baryon asymmetry and the correct dark matter abundance. The models we present have the further feature that they create the baryon number asymmetry at the weak scale, thereby avoiding the problems in some models of baryogenesis associated with high reheat temperatures in supersymmetric theories. Some of these models yield observable consequences in ongoing and future experiments.