Coherent Baryogenesis and Nonthermal Leptogenesis: A comparison
  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. 
Bjorn Garbrecht (Heidelberg U.), Tomislav Prokopec (Utrecht U.),   Michael G. Schmidt (Heidelberg U.)