Speaker
Avelino Vicente Montesinos
(Université de Liège)
Description
In standard type-I leptogenesis, the right-handed neutrino scattering processes are in general subleading. In contrast, in scenarios where the right-handed neutrinos couple to an extended scalar sector, their scattering processes with the new degrees of freedom can play a crucial role in the resulting B-L asymmetry. We study these scattering processes in a fairly model-independent way and show that, depending on the size of the couplings to the extended scalar sector, they can render leptogenesis inoperative or lead to large enhancements of the B-L yield. This effect will be present in a general class of models where the mass of the right-handed neutrinos is dynamically generated. As an example, we will illustrate it in a specific model with spontaneous lepton number violation.
Author
Avelino Vicente Montesinos
(Université de Liège)
