Axiogenesis

TL;DR

This paper introduces axiogenesis, a novel mechanism where the early universe's QCD axion rotation generates the observed baryon asymmetry, linking axion physics with baryogenesis and collider phenomenology.

Contribution

It proposes a new baryogenesis mechanism via axion rotation, connecting axion properties with baryon asymmetry and collider signals.

Findings

Predicts a small axion decay constant.

Links baryogenesis to collider phenomenology.

Suggests observable signals at LHC and future colliders.

Abstract

We propose a mechanism called axiogenesis where the cosmological excess of baryons over antibaryons is generated from the rotation of the QCD axion. The Peccei-Quinn (PQ) symmetry may be explicitly broken in the early universe, inducing the rotation of a PQ charged scalar field. The rotation corresponds to the asymmetry of the PQ charge, which is converted into the baryon asymmetry via QCD and electroweak sphaleron transitions. In the concrete model we explore, interesting phenomenology arises due to the prediction of a small decay constant and the connections with new physics at the LHC and future colliders and with axion dark matter.