ALP-portal majorana dark matter

TL;DR

This paper explores a model where axion-like particles (ALPs) act as portals to right-handed neutrino dark matter, analyzing interactions, constraints, and neutrino mass generation mechanisms.

Contribution

It introduces a generalized ALP-RHN interaction model considering existing constraints, linking ALP physics with right-handed neutrino dark matter.

Findings

ALP-RHN coupling can produce viable dark matter relic density.

Constraints from indirect detection limit the ALP-RHN interaction strength.

The model successfully generates light neutrino masses via type-I seesaw.

Abstract

Axion like particles(ALPs) and right handed neutrinos~(RHNs) are two well-motivated dark matter(DM) candidates. However, these two particles have a completely different origin. Axion was proposed to solve the Strong CP problem, whereas RHNs were introduced to explain light neutrino masses through seesaw mechanisms. We study the case of ALP portal RHN DM taking into account existing constraints on ALPs. We consider the leading effective operators mediating interactions between the ALP and SM particles and three RHNs to generate light neutrino masses through type-I seesaw. Further, ALP-RHN neutrino coupling is introduced to generalize the model which is restricted by the relic density and indirect detection constraint.