Scotogenic $A_4$ Neutrino Model for Nonzero $\theta_{13}$ and Large $\delta_{CP}$

TL;DR

This paper proposes a neutrino mass model based on the $A_4$ symmetry and dark matter interactions, explaining nonzero $ heta_{13}$ and large CP violation, compatible with various neutrino mass hierarchies.

Contribution

It introduces a scotogenic $A_4$-based model that naturally accounts for nonzero $ heta_{13}$ and large $ heta_{CP}$ in neutrino mixing.

Findings

Model accommodates normal and inverted hierarchies.

Predicts large leptonic CP violation.

Supports quasi-degenerate neutrino masses.

Abstract

Assuming that neutrinos acquire radiative seesaw Majorana masses through their interactions with dark matter, i.e. scotogenic from the Greek 'scotos' meaning darkness, and using the non-Abelian discrete symmetry $A_4$, we propose a model of neutrino masses and mixing with nonzero $\theta_{13}$ and necessarily large leptonic CP violation, allowing both the normal and inverted hierarchies of neutrino masses, as well as quasi-degenerate solutions.