The Galactic Center Excess from Z3 Scalar Semi-Annihilations

Abstract

We investigate the possibility of the Z3 scalar singlet model explaining the Fermi galactic centre excess. We find a good fit to the measured spectral excess in the region where the dark matter mass is comparable to the Higgs and the Higgs portal coupling ${\lambda }_{HS}\sim 0.04$. This preferred region is consistent with constraints from vacuum stability and current dark matter experiments, and will be discovered or falsified soon by future dark matter direct detection experiment.

11 pages, 3 figures; additional references

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• A Systematic Effective Operator Analysis of Semi-Annihilating Dark Matter
• Present and Future constraints on Secluded Dark Matter in the Galactic Halo with TeV Gamma-ray Observatories
• Phenomenology of Colored Radiative Neutrino Mass Model and Its Implications on the Cosmic-ray Observations
• Dark matter properties implied by gamma ray interstellar emission models