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The detailed origin of the diffuse gamma-ray background is still unknown.However, the contribution of unresolved sources is expected to inducesmall-scale anisotropies in this emission, which may provide a way to identifyand constrain the properties of its contributors. Recent studies have predictedthe contributions to the angular power spectrum (APS) from extragalactic andgalactic dark matter (DM) annihilation or decay. The Fermi-LAT collaborationreported detection of angular power with a significance larger than $3\sigma$in the energy range from 1 GeV to 10 GeV on 22 months of data [Ackermann et al.2012]. For these preliminary results the already published Fermi-LAT APSmeasurements [Ackermann et al. 2012] are compared to the accurate predictionsfor DM anisotropies from state-of-the-art cosmological simulations as presentedin [Fornasa et al. 2013] to derive constraints on different DM candidates.

nuclear instruments and methods in physics research. section a, accelerators, spectrometers, detectors and associated equipment/nuclear instruments and methods in physics research. section a, accelerators, spectrometers, detectors and associated equipment

Dark Matter implications of Fermi-LAT measurement of anisotropies in the diffuse gamma-ray background