Abstracts

Ion Cotaescu

Leptogenesis in a spatially flat Milne-type universe

The quantum electrodynamics on a spatially flat (1+3)-dimensional Friedmann-Lemaitre-Robertson-Walker space-time with a Milne-type scale factor is considered focusing on the amplitudes of the allowed effects in the first order of perturbations. The definition of the transition rates is reconsidered obtaining an appropriate angular behavior of the probability of the pair creation from a photon which has a similar rate as the leptons creation from vacuum.