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Annihilation of cosmologically distributed dark matter is predicted toproduce a potentially observable flux of high energy photons. Neglecting thecontribution from local structure, this signal is predicted to be virtuallyuniform on the sky and, in order to be identified, must compete with variousextragalactic backgrounds. We focus here on unresolved blazars and discussseveral techniques for separating the dark matter signal from this background.First, the spectral shapes of the signal and background are expected to differ,a feature which can be exploited with the Fisher Matrix formalism. Second, inany given angular pixel, the number of photons from blazars is drawn from adistribution which is far from Poisson. A knowledge of this distributionenhances one's ability to extract the dark matter signal, while ignorance of itcan lead to the introduction of a large systematic error.

Identifying Dark Matter Annihilation Products In The Diffuse Gamma Ray Background