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The origin of the cosmic gamma-ray background (CGB) is a longstanding mysteryin high-energy astrophysics. Possible candidates include ordinary astrophysicalobjects such as unresolved blazars, as well as more exotic processes such asdark matter annihilation. While it would be difficult to distinguish them fromthe mean intensity data alone, one can use anisotropy data instead. Weinvestigate the CGB anisotropy both from unresolved blazars and dark matterannihilation (including contributions from dark matter substructures), and findthat the angular power spectra from these sources are very different. We thenfocus on detectability of dark matter annihilation signals using the anisotropydata, by treating the unresolved blazar component as a known background. Wefind that the dark matter signature should be detectable in the angular powerspectrum of the CGB from two-year all-sky observations with the Gamma Ray LargeArea Space Telescope (GLAST), as long as the dark matter annihilationcontributes to a reasonable fraction, e.g., >~ 0.3, of the CGB at around 10GeV. We conclude that the anisotropy measurement of the CGB with GLAST shouldbe a powerful tool for revealing the CGB origin, and potentially for the firstdetection of dark matter annihilation.Comment: 17 pages, 8 figures; minor revision; accepted by Physical Review

Dark matter annihilation or unresolved astrophysical sources? Anisotropy probe of the origin of the cosmic gamma-ray background