Gamma Rays from Kaluza-Klein Dark Matter

Details Gamma Rays from Kaluza-Klein Dark Matter Gamma Rays from Kaluza-Klein Dark Matter

2004-10-14

arxiv.org/abs/astro-ph/0410359v2

Phys.Rev.Lett.94:131301,2005

Astronomy and Astrophysics

Astrophysics

4 pages, 3 figures. Revised version; minor changes in text and figures, two references added

Scientific paper

10.1103/PhysRevLett.94.131301

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.

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