The galactic center excess from Z3 scalar semi-annihilations

Abstract

We investigate the possibility of theZ3scalar 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 λHS∼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. (c) The Authors.