On quantum effects in soft leptogenesis

Abstract

It has been recently shown that quantum Boltzmann equations may be relevant forleptogenesis. Quantum effects, which lead to a time-dependent CP asymmetry,have been shown to be particularly important for resonant leptogenesis when theasymmetry is generated by the decay of two nearly degenerate states. In this work weinvestigate the impact of the use of quantum Boltzmann equations in the frameworkof ‘soft leptogenesis’ in which supersymmetry soft breaking terms give a smallmass splitting between the CP-even and CP-odd right-handed sneutrino states ofa single generation and provide the CP-violating phase to generate the leptonasymmetry.