Abstract
We study an extension of the scotogenic model with a real singlet scalar. It gives an origin of the mass of right-handed neutrinos and plays a role of inflaton through a non-minimal coupling with Ricci scalar. While an inert doublet scalar is an indispensable ingredient for neutrino mass generation in the model, it is also a promising dark matter (DM) candidate. Introduction of the singlet scalar could affect its nature of DM if mass of the singlet scalar is in a resonance region. We focus our study on such a case where inflaton mass is expected to be in a TeV range and reheating temperature is less than $10^9$ GeV. Thus the model requires low scale leptogenesis. After examining several effects brought about by the singlet scalar for the DM sector, we discuss DM phenomenology such as high energy neutrinos and monochromatic gammas caused by its annihilation.
Highlights
The standard model (SM) can describe well the nature up to the weak scale
If we assume that these new fields are assigned odd parity under the Z2 symmetry and all the SM contents have even parity, the neutrino mass is generated at one-loop level and the lightest neutral Z2 odd particle can behave as dark matter (DM)
We extended the scotogenic neutrino mass model with a real singlet scalar to explain the origin of the right-handed neutrino mass
Summary
The standard model (SM) can describe well the nature up to the weak scale. On the other hand, we know several experimental and observational results which are not explained within it. It uses a feature such that Higgs potential becomes flat enough for large field regions if the Higgs scalar has a large nonminimal coupling with Ricci scalar We apply this idea to a real singlet scalar which is introduced to the model in order to explain an origin of the mass of right-handed neutrinos. The nucleon-DM scattering is caused only through Higgs exchange, which gives a subdominant contribution in the DM coannihilation This feature could weaken the above-mentioned tension and keep it as a promising candidate for DM. The mass of a real part and an imaginary part of the neutral component is favored to be degenerate from a viewpoint of the small neutrino mass generation, and inelastic scattering could be caused for this DM These are expected to give a crucial influence on DM phenomenology in the model.
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