The Galactic Center Excess from Z3 Scalar Semi-Annihilations

TL;DR

This paper explores whether the Z3 scalar singlet dark matter model can explain the Fermi galactic center excess, fitting spectral data while satisfying experimental constraints and predicting testable future detection signals.

Contribution

It demonstrates that the Z3 scalar singlet model can account for the galactic center excess with specific parameter choices, aligning with current constraints and making testable predictions.

Findings

Good spectral fit with dark matter mass near Higgs mass

Model consistent with vacuum stability and dark matter constraints

Future experiments will test the predicted parameter space

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.