# Stability, reheating and leptogenesis

## TL;DR

This paper investigates how the stability of the Higgs vacuum during pre-heating constrains the parameter space of a minimal leptogenesis model involving sterile neutrinos and high-scale reheating.

## Contribution

It introduces stability constraints during pre-heating into leptogenesis models, refining the viable parameter space for thermal leptogenesis scenarios.

## Key findings

- Higgs vacuum stability imposes strong constraints on leptogenesis parameters.
- Reheat temperature determines sterile neutrino thermalization status.
- Constraints primarily affect thermal leptogenesis models.

## Abstract

In a minimal model of leptogenesis, the observed baryon asymmetry is realized after high-scale reheating into the lightest sterile neutrino. We consider constraints on this scenario from the stability of the Higgs vacuum during pre-heating. Depending on the reheat temperature, the lightest sterile neutrino may be in or out of thermal equilibrium at production. Demanding stability of the Higgs vacuum during pre-heating, we find strong constraints which primarily impact the parameter space of thermal leptogenesis.