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Abstract
In addition to gamma-rays, dark matter annihilation products can include energetic
electrons which inverse Compton scatter with the cosmic microwave background to produce
a diffuse extragalactic background of gamma-rays and X-rays. In models in which the
dark matter particles annihilate primarily to electrons or muons, the measurements
of EGRET and COMPTEL can provide significant constraints on the annihilation cross
section. The Fermi Gamma-Ray Space Telescope will likely provide an even more stringent
test of such scenarios.