Abstract
We consider the radiative generation of neutrino mass through the interactions of neutrinos with MeV dark matter. We construct a realistic renormalizable model with one scalar doublet (in additional to the standard model doublet) and one complex singlet together with three light singlet Majorana fermions, all transforming under a dark U(1)D symmetry which breaks softly to Z2. We study in detail the scalar sector which supports this specific scenario and its rich phenomenology.
Highlights
The nature of dark matter (DM) is one of the most disputed topics in cosmology
We review the elastic scattering cross section among the neutrino and DM and the related process of DM annihilation into neutrino pair based on this Yukawa coupling. To support this specific scenario, we study an extension of the standard model with one additional scalar doublet and one additional complex singlet, both of which transform nontrivially under a dark global U (1)D that is softly broken into a discrete Z2 (Section 3)
We present our numerical results with the implementation of all the theoretical and experimental constraints on the parameter space discussed in the previous Section
Summary
The nature of dark matter (DM) is one of the most disputed topics in cosmology. Until one (or two) decade(s) ago, only a few candidates prevailed in the literature, among which were neutralinos (a thermal, cold, DM species) and axions ( cold DM but non-thermal). Most DM studies have focused on either almost massless particles (axions), keV particles (sterile neutrinos) or GeV to TeV DM candidates (as provided by supersymmetry and Kaluza-Klein theories1) but the range between a few keV and GeV has been somewhat disregarded In cosmology, both keV and GeV-TeV DM candidates are generally assumed to be collisionless, even though their annihilations or decay are invoked to explain the observed DM abundance. To support this specific scenario, we study an extension of the standard model with one additional scalar doublet and one additional complex singlet, both of which transform nontrivially under a dark global U (1)D that is softly broken into a discrete Z2 (Section 3).
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