Speaker
Description
Leptogenesis can provide solutions to the baryon asymmetry of the Universe (BAU) and explain the origin of mass for SM neutrinos. In the framework of conventional thermal leptogenesis, a major obstacle arises from the strong washout effects. The final BAU is a competition between the asymmetric decay of right-handed neutrinos (RHNs) and the washout of the existing asymmetry. In this talk, I will introduce a new leptogenesis mechanism with a temperature-dependent coupling between the RHN and Standard Model particles. This coupling can suppress washout processes to ensure that washout rates remain consistently below the Hubble expansion rate, preserving all generated lepton asymmetry. I will show that the observed BAU can be successfully obtained in a larger RHN parameter space with dynamical couplings.
