A Review of WIMP Baryogenesis Mechanisms

TL;DR

This review discusses recent WIMP baryogenesis mechanisms that connect weak scale particle physics with cosmology, highlighting models, their phenomenology, and potential experimental signals at colliders and intensity frontier experiments.

Contribution

It summarizes two new WIMP baryogenesis models involving annihilation and decay, and explores their experimental testability and cosmological implications.

Findings

WIMP annihilation during freezeout can generate baryon asymmetry.

Metastable WIMP decay after freezeout offers an alternative baryogenesis pathway.

Models predict signals accessible at LHC and intensity frontier experiments.

Abstract

It was recently proposed that weakly interacting massive particles (WIMP) may provide new ways of generating the observed baryon asymmetry in the early universe, as well as addressing the cosmic coincidence between dark matter and baryon abundances. This suggests a new possible connection between weak scale new particle physics and modern cosmology. This review summarizes the general ideas and simple model examples of the two recently proposed WIMP baryogenesis mechanisms: baryogenesis from WIMP dark matter annihilation during thermal freezeout, and baryogenesis from metastable WIMP decay after thermal freezeout. This letter also discusses the interesting phenomenology of these models, in particular the experimental signals that can be probed in the intensity frontier experiments and the Large Hadron Collider (LHC) experiments.