Decaying Dark Matter in Supersymmetric Model and Cosmic-Ray Observations

TL;DR

This paper investigates decaying dark matter within a supersymmetric framework, demonstrating that such decay can explain cosmic-ray positron and electron data while constraining dark matter mass based on anti-proton and gamma-ray observations.

Contribution

It provides a detailed analysis of cosmic-ray fluxes from decaying dark matter, aligning theoretical predictions with observational data and constraining dark matter properties.

Findings

Dark matter decay can account for PAMELA and Fermi-LAT cosmic-ray data.

Dark matter mass constrained to less than 200-300 GeV to avoid anti-proton overproduction.

Gamma-ray flux predictions are consistent with Fermi-LAT observations for masses below 4 TeV.

Abstract

We study cosmic-rays in decaying dark matter scenario, assuming that the dark matter is the lightest superparticle and it decays through a R-parity violating operator. We calculate the fluxes of cosmic-rays from the decay of the dark matter and those from the standard astrophysical phenomena in the same propagation model using the GALPROP package. We reevaluate the preferred parameters characterizing standard astrophysical cosmic-ray sources with taking account of the effects of dark matter decay. We show that, if energetic leptons are produced by the decay of the dark matter, the fluxes of cosmic-ray positron and electron can be in good agreements with both PAMELA and Fermi-LAT data in wide parameter region. It is also discussed that, in the case where sizable number of hadrons are also produced by the decay of the dark matter, the mass of the dark matter is constrained to be less than 200-300 GeV in order to avoid the overproduction of anti-proton. We also show that the cosmic gamma-ray flux can be consistent with the results of Fermi-LAT observation if the mass of the dark matter is smaller than nearly 4 TeV.