A two-component dark matter extension of the scotogenic model in which both dark matter particles participate in the CP violation that generates the observed baryon asymmetry at the TeV scale.
Leptogenesis and the Higgs Portal
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abstract
We study the impact on leptogenesis of Higgs portal couplings to a new scalar singlet. These couplings open up additional $CP$-violating decay channels for the higher mass singlet neutrinos $N_2$ and $N_3$. We analyze the simplest case of two-level $N_1-N_2$ leptogenesis, including significant mass hierarchies, in which the $CP$ asymmetry is generated in part by singlet-mediated decays of $N_2$. For these models, provided the lightest singlet neutrino $N_1$ is sufficiently weakly coupled to avoid excessive washout, its mass scale is not directly constrained by the Davidson-Ibarra bound.
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Two-component Dark Matter and low scale Thermal Leptogenesis
A two-component dark matter extension of the scotogenic model in which both dark matter particles participate in the CP violation that generates the observed baryon asymmetry at the TeV scale.