Gravitational Wave Probe of Singlet-Doublet Dark Matter Induced Radiative Neutrino Mass

TL;DR

This paper explores a radiative neutrino mass model with singlet-doublet dark matter, showing that scalar interactions can induce a first-order phase transition producing observable gravitational waves, with implications for neutrino mass and lepton flavor violation.

Contribution

It introduces a novel one-loop radiative neutrino mass model with singlet-doublet dark matter, highlighting the role of scalar interactions in generating observable gravitational waves and phenomenological predictions.

Findings

Scalar interactions induce a first-order phase transition with observable gravitational waves.

The model predicts neutrino masses, muon g-2, and lepton flavor violation within experimental constraints.

Dark matter is composed of singlet-doublet Majorana fermions, consistent with phenomenology.

Abstract

We investigate an one loop radiative neutrino mass model, where the loop particles, notably a singlet fermion ($\chi$), a doublet fermion ($\Psi$) and three generations of singlet scalars ($\phi_i, i=\{1,2,3\}$) are assumed to be odd under an additional $\mathcal{Z}_2$-symmetry. In this setup, the singlet fermion mixes with the neutral component of the doublet to give rise singlet-doublet Majorana dark matter. The addition of $\mathcal{Z}_2$ odd scalars in the model provides rich phenomenological implications. We find that the quartic interaction terms between the SM Higgs and $\phi_i$s play a significant role in modifying the scalar potential to have a first-order phase transition (FOPT) leading to observable gravitational waves (GWs) spectra. We also examine the non-trivial role played by the singlet-doublet fermion DM and the scalars in loop-induced neutrino mass, $(g-2)_\mu$, and lepton flavor violation. We find that the model is predictive due to the combined constraints and can be verified at different terrestrial experiments.