  The AMS-02 collaboration has recently reported an excess of the cosmic-ray
positron fraction, which turned out to be consistent with previous results
reported by the PAMELA and Fermi-LAT collaborations. A decaying dark matter
with the mass around 1 TeV can be responsible for the excess of the positron
fraction when it is interpreted as a dark matter signal. Interestingly, the
pure gravity mediation model provides such a dark matter, namely an almost pure
neutral wino dark matter, when a tiny R-parity violation through $LLE^c$
interactions is introduced. We show that the decaying wino dark matter well
reproduces the energy spectrum of the fraction with being consistent with
constraints from cosmic-ray anti-proton and gamma-ray observations.

High Energy Physics - Phenomenology