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Kaluza-Klein Dark Matter, Electrons and Gamma Ray Telescopes

Edward A. Baltz·Dan Hooper
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Abstract

Kaluza-Klein dark matter particles can annihilate efficiently into electron-positron pairs, providing a discrete feature (a sharp edge) in the cosmic $e^+ e^-$ spectrum at an energy equal to the particle's mass (typically several hundred GeV to one TeV). Although this feature is probably beyond the reach of satellite or balloon-based cosmic ray experiments (those that distinguish the charge and mass of the primary particle), gamma ray telescopes may provide an alternative detection method. Designed to observe very high-energy gamma-rays, ACTs also observe the diffuse flux of electron-induced electromagnetic showers. The GLAST satellite, designed for gamma ray astronomy, will also observe any high energy showers (several hundred GeV and above) in its calorimeter. We show that high-significance detections of an electron-positron feature from Kaluza-Klein dark matter annihilations are possible with GLAST, and also with ACTs such as HESS, VERITAS or MAGIC.

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Edward A. Baltz, Dan Hooper. 2004-11-03. Kaluza-Klein Dark Matter, Electrons and Gamma Ray Telescopes. https://doi.org/10.1088/1475-7516%2F2005%2F07%2F001

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