Speaker
Description
Leptogenesis is arguably the best-motivated theory of baryogenesis, given the discovery of finite neutrino masses. However, its experimental test remains elusive due to the high energy scales involved. In this talk, I will discuss gravitational waves (GWs) produced via graviton bremsstrahlung from right-handed neutrino decays during leptogenesis. Detecting such a GW signal would provide strong evidence for leptogenesis and for the existence of heavy right-handed neutrinos. I will also discuss how an era of early matter domination, which can be induced by the presence of right-handed neutrinos, can mimic the effects of additional relativistic degrees of freedom and a higher reheating temperature. Information from the graviton bremsstrahlung GW spectrum can break this degeneracy.
