Search for Semi-Annihilating Dark Matter with Fermi-LAT, H.E.S.S., Planck, and the Cherenkov Telescope Array

Abstract

Dark matter annihilations have been fiercely restricted by the non-observation of excess events in indirect detection probes. Typically the interactions that dictate annihilation are also present in the dark matter-nucleon scattering cross section, also severely constrained by direct detection experiments. Semi-annihilations arise as a possible way to ameliorate the tension and even change the standard dark matter relic density calculation. In this work, we derive indirect detection bounds for several semi-annihilation channels including gauge bosons, the Higgs, leptophilic and leptophobic scalars. Our analysis is based on the gamma-ray observations in the direction of Dwarf Spheroidal Galaxies (Fermi-LAT) and the Galactic Center (H.E.S.S.), and Planck measurements of Cosmic Background Radiation. In addition, we derive the prospects for the Cherenkov Telescope Array (CTA) sensitivity to all these semi-annihilation modes.

18 pages, 8 figures, version accepted for publication in JCAP

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• Fermion and scalar two-component dark matter from a $Z_4$ symmetry
• Two-component scalar dark matter in $Z_{2n}$ scenarios
• TeV Dark Matter Searches in the Extragalactic Gamma-Ray Sky
• Phase Transitions and Gravitational Waves in a Model of ${\mathbb{Z}}_3$ Scalar Dark Matter
• Semi-Annihilation of Fermionic Dark Matter
• Constraining Gamma-ray Lines from Dark Matter Annihilation using Fermi-LAT and H.E.S.S. data