Stability, reheating and leptogenesis

Understand

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.