Coherent Baryogenesis and Nonthermal Leptogenesis: A comparison

Abstract

We present a new mechanism for baryogenesis: at preheating after inflation fermions acquire a varying mass by their coupling to a time dependent field. Their CP-violating mass matrix can generate a charge asymmetry to be transformed into a lepton asymmetry through decay into standard model particles and heavy Majorana neutrinos. In a concrete model of hybrid inflation we compare ``coherent baryogenesis'' with nonthermal leptogenesis by perturbative decay of the inflation condensates.

6 pages, 2 figures, contribution to the Proceedings of Strong and Electroweak Matter 2004 (SEWM2004), Helsinki, Finland, June 16-19, 2004