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Abstract: We study cosmic-rays in decaying dark matter scenario, assuming that the darkmatter is the lightest superparticle and it decays through a R-parity violatingoperator. We calculate the fluxes of cosmic-rays from the decay of the darkmatter and those from the standard astrophysical phenomena in the samepropagation model using the GALPROP package. We reevaluate the preferredparameters characterizing standard astrophysical cosmic-ray sources with takingaccount of the effects of dark matter decay. We show that, if energetic leptonsare produced by the decay of the dark matter, the fluxes of cosmic-ray positronand electron can be in good agreements with both PAMELA and Fermi-LAT data inwide parameter region. It is also discussed that, in the case where sizablenumber of hadrons are also produced by the decay of the dark matter, the massof the dark matter is constrained to be less than 200-300 GeV in order to avoidthe overproduction of anti-proton. We also show that the cosmic gamma-ray fluxcan be consistent with the results of Fermi-LAT observation if the mass of thedark matter is smaller than nearly 4 TeV.



Author: Koji Ishiwata, Shigeki Matsumoto, Takeo Moroi

Source: https://arxiv.org/



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