Astronomy and Astrophysics – Astrophysics
Scientific paper
2008-11-28
Phys.Rev.D79:043521,2009
Astronomy and Astrophysics
Astrophysics
13 pages, 11 figures
Scientific paper
10.1103/PhysRevD.79.043521
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.
Ando Shin'ichiro
Bertone Gianfranco
Profumo Stefano
Taoso Marco
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