Non-thermal Production of Minimal Dark Matter via Right-handed Neutrino Decay

Abstract

Minimal Dark Matter (MDM) stands as one of the simplest dark matter scenarios. In MDM models, annihilation and co-annihilation processes among the members of the MDM multiplet are usually very efficient, pushing the dark matter mass above $\mathcal{O}(10)$ TeV in order to reproduce the observed dark matter relic density. Motivated by this little drawback, in this paper we consider an extension of the MDM scenario by three right-handed neutrinos. Two specific choices for the MDM multiplet are studied: a fermionic $SU(2{)}_L$ quintuplet and a scalar $SU(2{)}_L$ septuplet. The lightest right-handed neutrino, with tiny Yukawa couplings, never reaches thermal equilibrium in the early universe and is produced by freeze-in. This creates a link between dark matter and neutrino physics: dark matter can be non-thermally produced by the decay of the lightest right-handed neutrino after freeze-out, allowing to lower significantly the dark matter mass. We discuss the phenomenology of the non-thermally produced MDM and, taking into account significant Sommerfeld corrections, we find that the dark matter mass must have some specific values in order not to be in conflict with the current bounds from gamma-ray observations.

22 pages, 4 figures, version to appear in JCAP

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• The Dawn of FIMP Dark Matter: A Review of Models and Constraints
• Gamma ray tests of Minimal Dark Matter
• Gamma-rays from Heavy Minimal Dark Matter
• Probing the Inert Doublet Dark Matter Model with Cherenkov Telescopes
• Two component WIMP-FImP dark matter model with singlet fermion, scalar and pseudo scalar
• A Radiative Model for the Weak Scale and Neutrino Mass via Dark Matter
• The Scale-Invariant Scotogenic Model
• Phenomenology of left-right symmetric dark matter
• MeV Dark Matter Complementarity and the Dark Photon Portal
• Millicharge or Decay: A Critical Take on Minimal Dark Matter
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• Forbidden frozen-in dark matter
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• Seesaw determination of the dark matter relic density
• Scalar Sector Phenomenology of Three-Loop Radiative Neutrino Mass Models
• The Sommerfeld Enhancement in the Scotogenic Model with Large Electroweak Scalar Multiplets
• Nonthermal dark matter models and signals
• Lepton Flavor Violation in the Inert Scalar Model with Higher Representations
• Lepton number violating operators with standard model gauge fields: A survey of neutrino masses from 3-loops and their link to dark matter
• A closer look at the seesaw-dark matter correspondence