Testing Viability of Benchmark Dark Matter Models for the Galactic Center Excess
Abstract
We examine the status of benchmark simplified dark matter models that have been proposed to explain the GeV gamma-ray Galactic Center excess. We constrain the available parameter space using updated observations from indirect detection, cosmology, direct detection, and accelerators. We show that there is still unconstrained parameter space in both classes of models we consider (a secluded dark sector with a vector portal coupling, and a two-Higgs doublet with a pseudoscalar mediator), and discuss the prospects for potential improvement of these constraints in future experiments.
Cite
@article{arxiv.2509.08043,
title = {Testing Viability of Benchmark Dark Matter Models for the Galactic Center Excess},
author = {Yongao Hu and Cari Cesarotti and Tracy R. Slatyer},
journal= {arXiv preprint arXiv:2509.08043},
year = {2026}
}
Comments
55 pages, 26 figures. v2 matches the journal version. v2 includes significant updates to the section on the 2HDM+a model to include constraints from decays of the heavy Higgs bosons