Both the gravitational lensing effect of cosmic shear and cosmological γ-ray emission are strongly related to the presence of dark matter (DM) in the Universe. Indeed DM structures are responsible for bending the light due to gravitational lensing, and those same objects can emit gamma rays, either because they host astrophysical sources, or directly by WIMP (Weakly Interacting Massive Particle) DM annihilations or decays. Such γ rays should therefore exhibit strong correlation with the cosmic shear signal, thus potentially providing novel information on the composition of the extragalactic γ-ray background (EGB). If the WIMP DM contribution to the EGB is significant enough, its strong correlation with cosmic shear makes such signal in principle detectable by combining forthcoming experiments.
Detecting WIMP dark matter signatures by cross-correlating gamma-ray anisotropies and cosmic shear
Camera S.
First
2014-01-01
Abstract
Both the gravitational lensing effect of cosmic shear and cosmological γ-ray emission are strongly related to the presence of dark matter (DM) in the Universe. Indeed DM structures are responsible for bending the light due to gravitational lensing, and those same objects can emit gamma rays, either because they host astrophysical sources, or directly by WIMP (Weakly Interacting Massive Particle) DM annihilations or decays. Such γ rays should therefore exhibit strong correlation with the cosmic shear signal, thus potentially providing novel information on the composition of the extragalactic γ-ray background (EGB). If the WIMP DM contribution to the EGB is significant enough, its strong correlation with cosmic shear makes such signal in principle detectable by combining forthcoming experiments.
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