Electroweak baryogenesis in supersymmetric variants

Abstract

We argue that the creation of a baryon asymmetry in the early universe is an intriguing case where several aspects of "Beyond" physics are needed. We then concentrate on baryogenesis in a strong first-order phase transition and discuss that supersymmetric variants of the electroweak theory (MSSM and some version of NMSSM) rather naturally provide the necessary ingredients. The charginos and the stops play a prominent role. We present CP-violating dispersion relations in the chargino sector and show results of a concrete model calculation for the asymmetry production based on quasi-classical Boltzmann transport equations and sphaleron transitions in the hot electroweak phase.

Axino dark matter from thermal production

“…Already a reheating temperature of T R ≈ 10 6 GeV is relatively small and excludes some models for inflation and baryogenesis such as thermal leptogenesis. Nevertheless, there are several baryogenesis scenarios-such as EW baryogenesis within SUSY (cf [48] and references therein) and leptogenesis via inflaton decay or right-handed sneutrino condensation (cf [49,50] and references therein)which can explain the baryon asymmetry in the Universe for a reheating temperature as low as 10 6 GeV. The gravitino problem can be avoided for T R ≈ 10 6 GeV.…”