Electroweak baryogenesis via chiral gravitational waves

TL;DR

This paper introduces a novel electroweak baryogenesis mechanism where helical magnetic fields produce chiral gravitational waves, leading to lepton asymmetry and ultimately explaining the observed baryon asymmetry.

Contribution

It presents a new baryogenesis mechanism involving gravitational waves from magnetic fields during phase transition, linking magnetic field evolution to matter-antimatter asymmetry.

Findings

Achieves observed baryon asymmetry within specific magnetic field scenarios.

Connects magnetic field inverse cascade evolution to baryogenesis.

Proposes magnetic fields as candidates for large-scale cosmic magnetic fields.

Abstract

We propose a new mechanism for electroweak baryogenesis based on gravitational waves generated by helical magnetic fields that are present during a first order electroweak phase transition. We generate a net lepton number through the gravitational chiral anomaly which appears due to the chiral gravitational waves produced by these magnetic fields. The observed value of baryon asymmetry can be obtained in our mechanism within parameter space of scenarios with an inverse cascade evolution for magnetic fields which can also be candidates for large-scale magnetic fields.