Renormalization group running triggered tri-resonant leptogenesis within neutrino flavor-symmetry models

TL;DR

This paper investigates how renormalization group effects can induce the necessary mass splittings among degenerate right-handed neutrinos in neutrino flavor-symmetry models, enabling tri-resonant leptogenesis to explain the universe's matter-antimatter asymmetry.

Contribution

It demonstrates that RG running effects can generate the required neutrino mass splittings in flavor-symmetry models, facilitating successful leptogenesis.

Findings

RG effects induce mass splittings compatible with leptogenesis

Parameter space reproduces observed baryon asymmetry

Models with flavor symmetries can account for matter-antimatter asymmetry

Abstract

In this paper, we have studied the consequences of some representative neutrino flavor-symmetry models for tri-resonant leptogenesis (which is realized by having three nearly degenerate right-handed neutrinos). To be specific, we have considered a neutrino flavor-symmetry model realizing the TM1 mixing and modular ${\rm A}^{}_4$, ${\rm S}^{}_4$ and ${\rm A}^{}_5$ symmetry models that have a right-handed neutrino mass matrix $M^{}_{\rm R}$ as shown in Eq.~(\ref{6}) which gives three exactly degenerate right-handed neutrino masses and consequently prohibits the leptogenesis mechanism to work successfully. For these models, we study the scenario that the desired right-handed neutrino mass splittings for leptogenesis to work are generated from the renormalization-group running effects. In such a scenario, we explore the parameter space that allows for the reproduction of the observed baryon-antibaryon asymmetry of the Universe.