Speaker
Description
In recent years, wash-in leptogenesis has emerged as a new mechanism to explain the baryon asymmetry of the universe. In contrast to other leptogenesis scenarios it does not require CP-violation in the right handed neutrino sector (RHN). Instead it relies on primordial charge asymmetries generated at higher energies which are washed into a non vanishing B-L asymmetry via RHNs.
In this talk we consider a nonzero primordial charge asymmetry in the right handed electrons and demonstrate how efficiently RHNs convert it into a B-L asymmetry in different temperature and mass regimes. Our main result is a lower bound on the lightest RHN mass, in the standard type-I seesaw mechanism, of 7-8 TeV from the requirement of successful wash-in leptogenesis.
