Leptogenesis from oscillations and dark matter

TL;DR

This paper explores extensions of the ARS leptogenesis mechanism involving neutrino oscillations to simultaneously explain dark matter and baryon asymmetry, proposing models with additional gauge bosons, axions, or majorons.

Contribution

It introduces new models extending the minimal ARS scenario to account for both leptogenesis and dark matter.

Findings

Models with a B-L gauge boson can produce the observed baryon asymmetry and dark matter.

Invisible QCD axion models can simultaneously explain dark matter and leptogenesis.

Singlet majoron models provide a unified framework for these phenomena.

Abstract

An extension of the Standard Model with Majorana singlet fermions in the 1-100 GeV range can give rise to a baryon asymmetry at freeze-in via the CP-violating oscillations of these neutrinos: this is the well known ARS mechanism. In this paper we consider possible extensions of the minimal ARS scenario that can account not only for successful leptogenesis but also explain other open problems such as dark matter. We find that an extension in the form of a weakly coupled B-L gauge boson, an invisible QCD axion model, and the singlet majoron model can simultaneously account for dark matter and the baryon asymmetry.