Leptogenesis with a dynamical seesaw scale

Understand

In the simplest type-I seesaw leptogenesis scenario right-handed neutrino annihilation processes are absent.

• However, in the presence of new interactions these processes are possible and can affect the resulting $B-L$ asymmetry in an important way.
• A prominent example is provided by models with spontaneous lepton number violation, where the existence of new dynamical degrees of freedom can play a crucial role.
• In this context, we provide a model-independent discussion of the effects of right-handed neutrino annihilations.