Gamma rays from the annihilation of singlet scalar dark matter

Abstract

We consider an extension of the Standard Model by a singlet scalar that accounts for the dark matter of the Universe. Within this model we compute the expected gamma ray flux from the annihilation of dark matter particles in a consistent way. To do so, an updated analysis of the parameter space of the model is first presented. By enforcing the relic density constraint from the very beginning, the viable parameter space gets reduced to just two variables: the singlet mass and the higgs mass. Current direct detection constraints are then found to require a singlet mass larger than 50 GeV. Finally, we compute the gamma ray flux and annihilation cross section and show that a large fraction of the viable parameter space lies within the sensitivity of Fermi-GLAST.

13 pages, 5 figures. v2: minor modifications to text and figures; main results unchanged. v3: some references added

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• Electroweak vacuum stability in presence of singlet scalar dark matter in TeV scale seesaw models
• New LUX and PandaX-II Results Illuminating the Simplest Higgs-Portal Dark Matter Models
• Two dark matter candidates: the case of inert doublet and singlet scalars
• Improved bounds on ${\mathbb{Z}}_3$ singlet dark matter
• Large contributions to dark matter annihilation from three-body final states
• Gauged Inverse Seesaw from Dark Matter
• Inert Doublet Dark Matter with an additional scalar singlet and 125 GeV Higgs Boson
• From WIMPs to FIMPs: Impact of Early Matter Domination
• Annihilation of singlet fermionic dark matter into two photons
• A new viable mass region of Dark matter and Dirac neutrino mass generation in a scotogenic extension of SM
• Bayesian WIMP detection with the Cherenkov Telescope Array
• Gravitational SIMPs