On Quantum Effects in Soft Leptogenesis

TL;DR

This paper explores how quantum Boltzmann equations influence soft leptogenesis, especially considering supersymmetry effects that induce small mass splittings and CP violation, impacting the generation of lepton asymmetry.

Contribution

It investigates the role of quantum effects in soft leptogenesis, highlighting their significance in scenarios with supersymmetry-induced mass splittings.

Findings

Quantum effects modify the CP asymmetry in soft leptogenesis.

Supersymmetry soft-breaking terms influence the lepton asymmetry generation.

Quantum Boltzmann equations are essential for accurate leptogenesis modeling.

Abstract

It has been recently shown that quantum Boltzman equations may be relevant for leptogenesis. Quantum effects, which lead to a time-dependent CP asymmetry, have been shown to be particularly important for resonant leptogenesis when the asymmetry is generated by the decay of two nearly degenerate states. In this work we investigate the impact of the use of quantum Boltzman equations in the framework ``soft leptogenesis'' in which supersymmetry soft-breaking terms give a small mass splitting between the CP-even and CP-odd right-handed sneutrino states of a single generation and provide the CP-violating phase to generate the lepton asymmetry.