Early Universe effective theories: The Soft Leptogenesis and R-Genesis Cases

Understand

We discuss the effective theory appropriate for studying soft leptogenesis at temperatures T>10^7 GeV.

• In this regime, the main source of the B-L asymmetry is the CP asymmetry of a new anomalous R-charge that couple to generalized anomalous electroweak processes.
• Baryogenesis thus occurs mainly through R-genesis, and with an efficiency that can be up to two orders of magnitude larger than in usual estimates.
• Contrary to common belief, a sizeable baryon asymmetry is generated also when thermal corrections to the CP asymmetries in sneutrino decays are neglected which, in soft leptogenesis, implyes vanishing lepton-flavour CP asymmetries.