Thermal corrections to a mediator mass can open kinematically forbidden decays and produce dark matter, with a relic abundance nearly independent of the dark matter mass for renormalizable couplings.
Radiative Light Dark Matter
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abstract
We present a Peccei-Quinn (PQ)-symmetric two-Higgs doublet model that naturally predicts a fermionic singlet dark matter in the mass range 10 keV-1 GeV. The origin of the smallness of the mass of this light singlet fermion arises predominantly at the one-loop level, upon soft or spontaneous breakdown of the PQ symmetry via a complex scalar field in a fashion similar to the so-called Dine-Fischler-Sredniki-Zhitnitsky axion model. The mass generation of this fermionic Radiative Light Dark Matter (RLDM) requires the existence of two heavy vector-like SU(2) isodoublets, which are not charged under the PQ symmetry. We show how the RLDM can be produced via the freeze-in mechanism, thus accounting for the missing matter in the Universe. Finally, we briefly discuss possible theoretical and phenomenological implications of the RLDM model for the strong CP problem and the CERN Large Hadron Collider (LHC).
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hep-ph 1years
2019 1verdicts
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Forbidden frozen-in dark matter
Thermal corrections to a mediator mass can open kinematically forbidden decays and produce dark matter, with a relic abundance nearly independent of the dark matter mass for renormalizable couplings.