Connecting dark matter, baryogenesis and neutrinoless double beta decay in a $A_{4}\otimes Z_{8}$ based $\nu$2HDM

TL;DR

This paper explores a neutrino model with specific symmetries that links dark matter, baryogenesis, and neutrinoless double beta decay, analyzing cosmological and experimental constraints on sterile neutrinos.

Contribution

It introduces a new sterile neutrino in an $A_{4} imes Z_{8}$ symmetric $ u$2HDM and studies its implications for dark matter, baryogenesis, and neutrinoless double beta decay under various constraints.

Findings

Sterile neutrino as a viable dark matter candidate with keV mass.

Model consistent with cosmological and experimental bounds.

Analysis of baryogenesis and neutrinoless double beta decay in the model.

Abstract

In this paper, we discuss the impact of neutrino phenomenology and related cosmology on an $A_{4}\otimes Z_{8}$ symmetric $\nu$2HDM along with an addition of a new particle, i.e. a gauge singlet(S). The additional particle is a sterile neutrino which is considered to be a probable dark matter candidate in our work. With the choice of sterile neutrino mass in keV range we evaluate the active-DM mixing angle, decay rate and relic abundance considering various cosmological constraints. Simultaneously, a detailed analysis on baryogenesis and neutrinoless double beta decay is also carried out for low scale right-handed neutrino masses. We have considered various bounds from experiments such as Lyman-$\alpha$, X-ray observation, Planck data and KamLAND-Zen limit to validate the model w.r.t the phenomena studied in it.