Leptogenesis in a Majoron+Triplet model

TL;DR

This paper explores how leptogenesis mechanisms are affected in a majoron model extended with a right-handed SU(2)_L triplet fermion, emphasizing the importance of coupled Boltzmann equations for accurate modeling.

Contribution

It introduces a novel extension of the majoron model with a triplet fermion and analyzes the impact on leptogenesis dynamics across various parameters.

Findings

Interactions with new particles significantly alter leptogenesis pathways.

Coupled Boltzmann equations are necessary for accurate evolution modeling.

Parameter space regions where simplified equations are insufficient.

Abstract

We discuss leptogenesis in a majoron model extended by a right-handed $SU(2)_L$ triplet fermion. We study several different parameter assignments and find that the interactions of neutrinos with the new particles in the majoron+triplet model can significantly alter the way leptogenesis proceeds. We show that for large parts of the considered parameter space, it is essential to solve the set of coupled Boltzmann equations for the evolution of the neutrinos and the additional particles rather than solving the Boltzmann equations for the neutrino evolution only.