Galactic Centre GeV Photons from Dark Technicolor

Abstract

We present a classically scale-invariant model with a confining dark sector, which is coupled to the Standard Model through the Higgs portal. The galactic centre gamma ray excess can be explained in this model by collision-induced dark matter decays to b-quarks. We discuss the possibility to obtain the dark matter relic density through thermal freeze-out, which however requires excessive fine-tuning. We then instead focus on a freeze-in scenario and perform detailed calculations and a parameter scan. We find that the observed relic density and the gamma ray excess can be explained by a wide range of parameters in this model.

7 pages, 5 figures. The final version to be published in JHEP

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Cited by in corpus (7)

• The Dawn of FIMP Dark Matter: A Review of Models and Constraints
• A Tale of Tails: Dark Matter Interpretations of the Fermi GeV Excess in Light of Background Model Systematics
• WIMPs at the Galactic Center
• Nambu-Goldstone Dark Matter in a Scale Invariant Bright Hidden Sector
• Scale genesis and gravitational wave in a classically scale invariant extension of the standard model
• Interpreting the galactic center gamma-ray excess in the NMSSM
• Dark matter properties implied by gamma ray interstellar emission models