Baryogenesis via leptonic CP-violating phase transition

TL;DR

This paper introduces a novel leptogenesis mechanism driven by a vacuum CP-violating phase transition, linking early universe asymmetry generation with low-energy neutrino physics without requiring a specific UV completion.

Contribution

It proposes a new leptogenesis process based on vacuum CP violation during a phase transition, independent of detailed seesaw models or UV completions.

Findings

Lepton asymmetry can be generated via a dynamically realized Weinberg operator.

The mechanism connects leptogenesis with low-energy neutrino observables.

It offers an alternative to classical thermal leptogenesis without specifying UV details.

Abstract

We propose a new mechanism to generate a lepton asymmetry based on the vacuum CP-violating phase transition (CPPT). This approach differs from classical thermal leptogenesis as a specific seesaw model, and its UV completion, need not be specified. The lepton asymmetry is generated via the dynamically realised coupling of the Weinberg operator during the phase transition. This mechanism provides a connection with low-energy neutrino observables.