Gravitational wave probe of singlet-doublet dark matter induced radiative neutrino mass

A bstract We investigate a one loop radiative neutrino mass model, where the loop particles, notably a singlet fermion ( χ ), a doublet fermion (Ψ) and three generations of singlet scalars ( ϕ i , i = {1, 2, 3}) are assumed to be odd under an additional $$ {\mathcal{Z}}_2 $$ 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 $$ {\mathcal{Z}}_2 $$ Z 2 odd scalars in the model provides rich phenomenological implications. We find that the quartic interaction terms between the SM Higgs and ϕ i s play a significant role in modifying the scalar potential to have a first-order phase transition (FOPT) leading to observable gravitational wave (GW) 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) μ , and lepton flavor violation. We find that the model is predictive due to the combined constraints and can be verified at different terrestrial experiments.