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Related Experiment Videos

Gamma rays from Kaluza-Klein dark matter.

Lars Bergström1, Torsten Bringmann, Martin Eriksson

  • 1Department of Physics, Stockholm University, AlbaNova University Center, SE-106 91 Stockholm, Sweden. lbe@physto.se

Physical Review Letters
|May 21, 2005
PubMed
Summary

Kaluza-Klein (KK) dark matter annihilations may explain the TeV gamma-ray signal from the Galactic center. A 1 TeV KK particle fits HESS data, while a 10 TeV particle explains relic density and the full photon spectrum.

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Area of Science:

  • Particle Physics
  • Astrophysics
  • Cosmology

Background:

  • The High Energy Stereoscopic System (HESS) experiment detected a TeV gamma-ray signal from the Galactic Center (GC).
  • The origin of this signal is unknown and could be related to dark matter.
  • Kaluza-Klein (KK) particles are theoretical candidates for dark matter.

Purpose of the Study:

  • To investigate if Kaluza-Klein dark matter annihilations can explain the observed gamma-ray signal from the GC.
  • To model the gamma-ray spectrum resulting from KK dark matter annihilation.

Main Methods:

  • Simulating gamma-ray spectra from KK dark matter annihilation.
  • Including contributions from internal bremsstrahlung and subsequent decays of quarks and tau leptons.
  • Comparing model predictions with HESS experimental data.

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Main Results:

  • A very flat gamma-ray spectrum with an abrupt drop at the dark matter particle mass was found.
  • A KK mass of approximately 1 TeV provides a good fit to HESS data below 1 TeV.
  • A similar model with larger gauge coupling and a 10 TeV particle mass explains both relic density and the full observed photon spectrum.

Conclusions:

  • Kaluza-Klein dark matter annihilation is a plausible explanation for the HESS gamma-ray signal from the Galactic Center.
  • The specific mass and properties of the KK particle can be constrained by the observed gamma-ray spectrum.
  • Further investigation with different model parameters could fully reconcile dark matter properties with cosmological observations.