Non-thermal WIMP baryogenesis

TL;DR

This paper introduces a non-thermal WIMP baryogenesis mechanism where dark matter produced from heavy particle decay re-annihilates to generate baryon asymmetry and relic density, allowing for heavier DM and larger annihilation cross sections.

Contribution

It presents a novel non-thermal WIMP baryogenesis model that accommodates heavier dark matter and larger annihilation cross sections than traditional thermal models.

Findings

Dark matter can be produced non-thermally during reheating.

Re-annihilation of dark matter can generate baryon asymmetry.

The model allows for heavier dark matter and larger annihilation cross sections.

Abstract

We propose a WIMP baryogensis achieved by the annihilation of non-thermally produced WIMPs from decay of heavy particles, which can result in low reheating temerature. Dark matter (DM) can be produced non-thermally during a reheating period created by the decay of long-lived heavy particle, and subsequently re-annihilate to lighter particles even after the thermal freeze-out. The re-annihilation of DM provides the observed baryon asymmetry as well as the correct relic density of DM. We investigate how wahout effects can affect the generation of the baryon asymmetry and study a model suppressing them. In this scenario, we find that DM can be heavy enough and its annihilation cross section can also be larger than that adopted in the usual thermal WIMP baryogenesis.