Leptogenesis with exclusively low-energy CP Violation in the Context of Minimal Lepton Flavour Violation

TL;DR

This paper explores how low-energy CP violation can generate the universe's matter-antimatter asymmetry through resonant leptogenesis within a minimal lepton flavor violation framework, highlighting the importance of flavor effects.

Contribution

It demonstrates that successful leptogenesis can occur with low-energy CP violation alone, imposing new constraints on neutrino parameters within a minimal lepton flavor violation model.

Findings

Leptogenesis can be achieved independently of the Majorana scale.

Flavor effects significantly influence the generation of the baryon asymmetry.

Low-energy CP violation constrains neutrino parameters for successful leptogenesis.

Abstract

We analyze lepton flavour violation (LFV) and the generation of the observed baryon-antibaryon asymmetry of the Universe (BAU) within a generalized minimal lepton flavour violation framework with three quasi-degenerate heavy Majorana neutrinos. The BAU which is obtained through radiative resonant leptogenesis can successfully be generated widely independent of the Majorana scale in this scenario and flavour effects are found to be relevant. Then we discuss the specific case in which CP violation is exclusively present at low-energies (a real R matrix) in the flavour sensitive temperature regime. Successful leptogenesis in this case leads to strong constraints on low-energy neutrino parameters.