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We perform a phenomenological study of the scalar sector of two models thatgenerate neutrino mass at the three-loop level and contain viable dark mattercandidates. Both models contain a charged singlet scalar and a larger scalarmultiplet (triplet or quintuplet). We investigate the effect of the extrascalars on the Higgs mass and analyze the modifications to the triple Higgscoupling. The new scalars can give observable changes to the Higgs decaychannel $h\rightarrow\gamma \gamma$ and, furthermore, we find that theelectroweak phase transition becomes strongly first-order in large regions ofparameter space.

Scalar Sector Phenomenology of Three-Loop Radiative Neutrino Mass Models