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Updated: Jun 23, 2026

Setting Limits on Supersymmetry Using Simplified Models
Published on: November 15, 2013
Early annihilation and diffuse backgrounds in models of weakly interacting massive particles in which the cross
Marc Kamionkowski1, Stefano Profumo
1California Institute of Technology, Mail Code 130-33, Pasadena, California 91125, USA.
Abstract:
Recent studies have considered modifications to the standard weakly interacting massive particle scenario in which the pair annihilation cross section (times relative velocity v) is enhanced by a factor 1/upsilon to approximately 10(-3) in the Galaxy, enough to explain several puzzling Galactic radiation signals. We show that in these scenarios a burst of weakly interacting massive particle annihilation occurs in the first collapsed dark-matter halos. We show that severe constraints to the annihilation cross section derive from measurements of the diffuse extragalactic radiation and from ionization and heating of the intergalactic medium.
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