# A Radiative Neutrino Mass Model with SIMP Dark Matter

## TL;DR

This paper introduces a novel radiative neutrino mass model where SIMP dark matter is stabilized by a discrete symmetry, with its relic abundance and astrophysical constraints successfully addressed.

## Contribution

It presents the first viable radiative seesaw model incorporating SIMP dark matter with a $ ext{Z}_5$ symmetry and detailed phenomenological analysis.

## Key findings

- Neutrino masses generated via two-loop diagrams involving SIMP DM.
- SIMP DM relic abundance achieved with perturbative couplings in the resonant scenario.
- Astrophysical bounds from Bullet cluster and halo shapes satisfied.

## Abstract

We propose the first viable radiative seesaw model, in which the neutrino masses are induced radiatively via the two-loop Feynman diagram involving Strongly Interacting Massive Particles (SIMP). The stability of SIMP dark matter (DM) is ensured by a $\mathbb{Z}_5$ discrete symmetry, through which the DM annihilation rate is dominated by the $3 \to 2$ self-annihilating processes. The right amount of thermal relic abundance can be obtained with perturbative couplings in the resonant SIMP scenario, while the astrophysical bounds inferred from the Bullet cluster and spherical halo shapes can be satisfied. We show that SIMP DM is able to maintain kinetic equilibrium with thermal plasma until the freeze-out temperature via the Yukawa interactions associated with neutrino mass generation.