The Role of Lepton Flavours in Thermal Leptogenesis

TL;DR

This paper discusses how incorporating lepton flavours into thermal leptogenesis models significantly alters the understanding of how the matter-antimatter asymmetry in the universe can be generated.

Contribution

It introduces the impact of lepton flavour effects into the Boltzmann equations for thermal leptogenesis, refining the mechanism's efficiency evaluation.

Findings

Lepton flavours significantly modify leptogenesis efficiency.

Flavour effects alter the predicted baryon asymmetry.

Inclusion of flavours improves agreement with observed matter-antimatter asymmetry.

Abstract

Thermal leptogenesis, that can be viewed as a consequence of the seesaw model, is a very natural mechanism to explain the matter anti-matter asymmetry of the Universe. Recently, lepton flavours have been included in the Boltzmann equations, modifying significantly the evaluation of the efficiency of leptogenesis to explain the observed baryon asymmetry.