Gamma rays from Kaluza-Klein dark matter
Oct, 2004
Citations per year
Abstract: (arXiv)
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.- 98.70.Rz
- 04.50.+h
- 95.35.+d
- 11.10.Kk
- dark matter
- gamma-ray astronomy
- Galactic centre
- Kaluza-Klein theory
- quark decay
- lepton decay
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