Constraints on decaying dark matter from the extragalactic gamma-ray background
作者： Shin'ichiro Ando , Koji Ishiwata
DOI: 10.1088/1475-7516/2015/05/024
关键词: Astronomy 、 Physics 、 Light dark matter 、 Dark matter 、 Dark fluid 、 Warm dark matter 、 Scalar field dark matter 、 Hot dark matter 、 Dark matter halo 、 Baryonic dark matter 、 Astrophysics
摘要: If dark matter is unstable and the mass within GeV-TeV regime, its decays produce high-energy photons that give contribution to extragalactic gamma-ray background (EGRB). We constrain decay by analyzing 50-month EGRB data measured with Fermi satellite, for di ff erent channels motivated several supersymmetric scenarios featuring R-parity violation. adopt latest astrophysical models various source classes such as active galactic nuclei star-forming galaxies, take associated uncertainties properly into account. The lower limits lifetime are very stringent a wide range of mass, excluding shorter than 10(28) s between few hundred GeV similar 1 TeV, e.g., b (b) over bar channel. Furthermore, most explain anomalous positron excess also excluded. These constraints robust, being little dependent on uncertainties, unlike other probes Galactic positrons or anti-protons.
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