Gamma Rays from Kaluza-Klein Dark Matter
Abstract
A TeV gamma-ray signal from the direction of the Galactic center (GC) has been detected by the H.E.S.S. experiment. Here, we investigate whether Kaluza-Klein (KK) dark matter annihilations near the GC can be the explanation. Including the contributions from internal bremsstrahlung as well as subsequent decays of quarks and tau leptons, we find a very flat gamma-ray spectrum which drops abruptly at the dark matter particle mass. For a KK mass of about 1 TeV, this gives a good fit to the H.E.S.S. data below 1 TeV. A similar model, with gauge coupling roughly three times as large and a particle mass of about 10 TeV, would give both the correct relic density and a photon spectrum that fits the complete range of data.
Cite
@article{arxiv.astro-ph/0410359,
title = {Gamma Rays from Kaluza-Klein Dark Matter},
author = {Lars Bergstrom and Torsten Bringmann and Martin Eriksson and Michael Gustafsson},
journal= {arXiv preprint arXiv:astro-ph/0410359},
year = {2008}
}
Comments
4 pages, 3 figures. Revised version; minor changes in text and figures, two references added