$SU(2)_X$ Vector DM and Galactic Center Gamma-Ray Excess

TL;DR

This paper proposes a model with $SU(2)_X$ vector dark matter stabilized by a $Z_3$ symmetry, explaining the Galactic Center gamma-ray excess with a 70 GeV dark matter candidate that interacts via Higgs portal.

Contribution

The paper introduces a novel $SU(2)_X$ gauge symmetry model with vector dark matter and demonstrates its ability to explain gamma-ray excess data.

Findings

Dark matter mass around 70 GeV fits gamma-ray excess data.

Model consistent with relic density and direct detection constraints.

Dark matter interacts via Higgs portal, enabling observable signals.

Abstract

An unbroken $Z_3$ symmetry remains when local $SU(2)_X$ is broken spontaneously by one quadruplet. The gauge boson $\chi_\mu (\bar \chi_\mu )$ carries the dark charge and is the candidate of dark matter (DM). By the mixture of scalar boson $\phi_r$ of quadruplet and standard model (SM) Higgs, the DM can annihilate to SM particles through Higgs portal. For investigating the implications of vector DM, we study the relic density of DM, the direct detection of DM-nucleon scattering and the excess of gamma-ray spectrum, which is supported by the data from {\it Fermi} Gamma-Ray Space Telescope. We find that with the DM mass of around $70$ GeV in our model, the excess of gamma-ray could be fitted well with the data.