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Angular correlations in the cosmic gamma-ray background from dark matter annihilation around intermediate-mass black holes

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arxiv 0811.4493 v1 pith:VQANNTCO submitted 2008-11-28 astro-ph hep-ph

Angular correlations in the cosmic gamma-ray background from dark matter annihilation around intermediate-mass black holes

classification astro-ph hep-ph
keywords annihilationgamma-rayangulararoundbackgroundblackcorrelationscosmic
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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Dark matter (DM) annihilation could in principle contribute to the diffuse cosmic gamma-ray back- ground (CGB). While with standard assumptions for cosmological and particle physics parameters this contribution is expected to be rather small, a number of processes could boost it, including a larger-than-expected DM annihilation cross-section, or the occurance of DM substructures such as DM mini-spikes around intermediate-mass black holes. We show that angular correlations of the CGB provide a tool to disentangle the signal induced by DM annihilation in mini-spikes from a conventional astrophysical component. Treating blazars as a known background, we study the prospects for detecting DM annihilations with the Fermi Gamma-Ray Space Telescope for different choices of DM mass and annihilation channels.

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