# Leptogenesis from spontaneous symmetry breaking during inflation

## TL;DR

This paper proposes a novel mechanism where spontaneous symmetry breaking of the Higgs field during inflation leads to a CPT-violating phase, enabling matter-antimatter asymmetry generation during Higgs relaxation.

## Contribution

It introduces a new leptogenesis scenario driven by Higgs field dynamics during inflation, linking symmetry breaking to baryogenesis.

## Key findings

- Higgs field acquires a large VEV during inflation due to non-minimal coupling.
- CPT violation occurs during Higgs relaxation, enabling matter-antimatter asymmetry.
- The mechanism provides a viable pathway for leptogenesis in the early universe.

## Abstract

Symmetry breaking in the Higgs field via a non-minimal coupling to gravity or higher-dimensional interactions with the inflaton can lead to condensation at a large vacuum expectation value (VEV) during inflation. After inflation is over, the Higgs field must relax to the minimum of its effective potential, creating an era in which the CPT is effectively broken by the time-depended VEV. We show that the matter-antimatter asymmetry can be generated during this relaxation epoch.