Semi-Annihilation of Fermionic Dark Matter

Abstract

The continued non-observation of events emanating from dark matter (DM) annihilations in various direct and indirect detection experiments calls into question the mechanism for determining the relic density of a weakly interacting massive particle. However, if the relic density is determined primarily by a semi-annihilation process, as opposed to the usual annihilation, this tension can be ameliorated. Here, we investigate a Z3 symmetric effective field theory incorporating a fermionic dark matter that semi-annihilates to right-handed neutrinos (RHN). The dynamics of the RHN and the impact of its late decays are also scrutinised while obtaining the correct DM relic. Finally, indirect detection bounds on the semi-annihilation cross-sections are drawn from the gamma-ray observations in the direction of Dwarf Spheroidal Galaxies (Fermi-LAT), and including the projections obtained for the H.E.S.S. and the CTA detectors.

22 pages, 7 figures

References in corpus (10)

• An Introduction to PYTHIA 8.2
• Impact of Semi-annihilation of Z3 Symmetric Dark Matter with Radiative Neutrino Masses
• Right-handed sneutrino dark matter in $\mathbf{U}(1{)}^{\prime }$ seesaw models and its signatures at the LHC
• CMB anisotropy and BBN constraints on pre-recombination decay of dark matter to visible particles
• Implications of right-handed neutrinos in $B-L$ extended standard model with scalar dark matter
• The Semi-Hooperon: Gamma-ray and anti-proton excesses in the Galactic Center
• Feeble neutrino portal dark matter at neutrino detectors
• Dark Matter Relic Abundance and Light Sterile Neutrinos
• Search for Semi-Annihilating Dark Matter with Fermi-LAT, H.E.S.S., Planck, and the Cherenkov Telescope Array
• Semi-annihilating dark matter coupled with Majorons

Cited by in corpus (2)

• Confronting global 21-cm signal with ${\mathbb{Z}}_3$ symmetric dark matter models
• Asymmetric dark matter from semi-annihilation: unitarity constraints and long-lived final states