Tomographic-spectral approach for dark matter detection in the cross-correlation between cosmic shear and diffuse γ-ray emission
作者： S. Camera , M. Fornasa , N. Fornengo , M. Regis
DOI: 10.1088/1475-7516/2015/06/029
关键词: Gravitational lens 、 Dark matter 、 Physics 、 Weak gravitational lensing 、 Astrophysics 、 Fermi Gamma-ray Space Telescope 、 Redshift 、 Annihilation 、 COSMIC cancer database 、 Dark energy
摘要: We recently proposed to cross-correlate the diffuse extragalactic γ-ray background with gravitational lensing signal of cosmic shear. This represents a novel and promising strategy search for annihilating or decaying particle dark matter (DM) candidates. In present work, we demonstrate potential tomographic-spectral approach: measuring cross-correlation in separate bins redshift energy significantly improves sensitivity DM signal. Indeed, technique here takes advantage different scaling astrophysical components and, simultaneously their spectra angular extensions. The is extremely even when DM-induced emission quite faint. first quantify prospects detecting by cross-correlating Fermi Large Area Telescope (LAT) shear expected from Dark Energy Survey. Under hypothesis significant subhalo boost, such measurement can deliver 5σ detection DM, if lighter than 300 GeV has thermal annihilation rate. then forecast capability European Space Agency Euclid satellite (whose launch planned 2020), combination an hypothetical future detector slightly improved specifications compared current telescopes. predict that data will allow mass uncertainty factor 1.5–2, moderate boosts, masses up few hundreds rates.
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