Leptogenesis and CPT Violation

TL;DR

This paper proposes a CPT-violating neutrino model where neutrinos and anti-neutrinos have identical masses but different energy relations, enabling leptogenesis without lepton number violation or new particles.

Contribution

It introduces a novel CPT-violating framework for neutrinos that explains leptogenesis without requiring lepton number violation or additional particles.

Findings

Leptogenesis can occur with CPT violation without lepton number violation.

The model is consistent with existing neutrino data.

No new particles or symmetries are needed.

Abstract

We construct a model in which neutrinos and anti-neutrinos acquire the same mass but slightly different energy dispersion relations.Despite CPT violation, spin-statistics is preserved. We find that leptogenesis can be easily explained within this model, without upsetting the solar, atmospheric and reactor neutrino data. Leptogenesis occurs without lepton number violation and the non-equilibrium condition. We consider only three active Dirac neutrinos, and no new particles or symmetries are introduced.