Type-II Leptogenesis

TL;DR

This paper introduces a novel type-II leptogenesis theory for baryogenesis, emphasizing the role of the PMNS phase and gauge symmetry breaking, differing from traditional type-I leptogenesis models.

Contribution

It proposes a new leptogenesis mechanism utilizing the PMNS phase and gauge symmetry breaking, offering an alternative to established models.

Findings

PMNS phase is crucial for Sakharov's condition in type-II leptogenesis

Gauge symmetry must be broken during leptogenesis for the mechanism to work

Different from conventional type-I leptogenesis models

Abstract

I will talk on our new theory on baryogenesis through type-II leptogenesis which is different from the well-known type-I leptogenesis. I will comment on the Jarlskog phases, $\delta_{\rm CKM}$ and $\delta_{\rm PMNS}$, in the CKM and PMNS matrices. In the type-II leptogenesis, the PMNS phase is used for Sakharov's condition on the global quantum number generation in the Universe. For this to be effective, the SU(2)$\times$U(1) gauge symmetry must be broken during the leptogenesis epoch.