Multicomponent Dark Matter in Radiative Seesaw Models

Abstract

We discuss radiative seesaw models, in which an exact $Z_2\times Z_2^{\prime }$ symmetry is imposed. Due to the exact $Z_2\times Z_2^{\prime }$ symmetry, neutrino masses are generated at a two-loop level and at least two extra stable electrically neutral particles are predicted. We consider two models: one has a multi-component dark matter system and the other one has a dark radiation in addition to a dark matter. In the multi-component dark matter system, non-standard dark matter annihilation processes exist. We find that they play important roles in determining the relic abundance and also responsible for the monochromatic neutrino lines resulting from the dark matter annihilation process. In the model with the dark radiation, the structure of the Yukawa coupling is considerably constrained and gives an interesting relationship among cosmology, lepton flavor violating decay of the charged leptons and the decay of the inert Higgs bosons.

arXiv comment28 pages, 13 figures and 2 tables. Version accepted in the 'Frontiers in Physics' Research Topic 'The Physics Associated with Neutrino Masses'

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