The galactic center excess from ℤ 3 $$ {mathbb{Z}}_3 $$ scalar semi-annihilations

We investigate the possibility of the $$ {mathbb{z}}_3 $$ 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 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.