Asymmetric Dark Matter and Baryogenesis from Pseudoscalar Inflation

TL;DR

This paper proposes a unified mechanism during pseudoscalar inflation that explains both the Universe's baryon asymmetry and dark matter abundance through helical hypermagnetic fields and the chiral anomaly, with dark matter mass between 7-15 GeV.

Contribution

It introduces a minimal, anomaly-free asymmetric dark matter model utilizing hypermagnetic fields generated during inflation to simultaneously account for baryogenesis and dark matter.

Findings

Achieves observed baryon and dark matter abundances across various inflationary parameters.

Dark matter mass is constrained to 7-15 GeV.

The mechanism links CP violation during inflation to both matter asymmetries.

Abstract

We show that both the baryon asymmetry of the Universe and the dark matter abundance can be explained within a single framework that makes use of maximally helical hypermagnetic fields produced during pseudoscalar inflation and the chiral anomaly in the Standard Model. We consider a minimal asymmetric dark matter model free from anomalies and constraints. We find that the observed baryon and the dark matter abundances are achieved for a wide range of inflationary parameters, and the dark matter mass ranges between 7-15 GeV. The novelty of our mechanism stems from the fact that the same source of CP violation occurring during inflation explains both baryonic and dark matter in the Universe with two inflationary parameters, hence addressing all the initial condition problems in an economical way.