Supersymmetric Leptogenesis

Understand

We study leptogenesis in the supersymmetric standard model plus the seesaw.

• We identify important qualitative differences that characterize supersymmetric leptogenesis with respect to the non-supersymmetric case.
• The lepton number asymmetries in fermions and scalars do not equilibrate, and are related via a non-vanishing gaugino chemical potential.
• Due to the presence of new anomalous symmetries, electroweak sphalerons couple to winos and higgsinos, and QCD sphalerons couple to gluinos, thus modifying the corresponding chemical equilibrium conditions.