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UvA-DARE ( Digital Academic Repository ) Constraints on decaying dark matter from the extragalactic gamma-ray
| Content Provider | Semantic Scholar |
|---|---|
| Author | Ando, Shin’ichiro Ishiwata, Koji |
| Copyright Year | 2015 |
| Abstract | If dark matter is unstable and the mass is within GeV–TeV regime, its decays produce high-energy photons that give contribution to the extragalactic gamma-ray background (EGRB). We constrain dark matter decay by analyzing the 50-month EGRB data measured with Fermi satellite, for different decay channels motivated with several supersymmetric scenarios featuring R-parity violation. We adopt the latest astrophysical models for various source classes such as active galactic nuclei and star-forming galaxies, and take associated uncertainties properly into account. The lower limits for the lifetime are very stringent for a wide range of dark matter mass, excluding the lifetime shorter than 1028 s for mass between a few hundred GeV and ∼1 TeV, e.g., for bb̄ decay channel. Furthermore, most dark matter models that explain the anomalous positron excess are also excluded. These constraints are robust, being little dependent on astrophysical uncertainties, unlike other probes such as Galactic positrons or anti-protons. ar X iv :1 50 2. 02 00 7v 2 [ as tr oph .C O ] 1 8 M ay 2 01 5 |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | https://pure.uva.nl/ws/files/2584257/173860_1502_02007v2.pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
