Decaying Dark Matter and the PAMELA Anomaly

Details Decaying Dark Matter and the PAMELA Anomaly Decaying Dark Matter and the PAMELA Anomaly

2008-11-10

arxiv.org/abs/0811.1555v1

JCAP 0902:021,2009

Physics

High Energy Physics

High Energy Physics - Phenomenology

18 pages, 6 figures

Scientific paper

10.1088/1475-7516/2009/02/021

Astrophysical and cosmological observations do not require the dark matter particles to be absolutely stable. If they are indeed unstable, their decay into positrons might occur at a sufficiently large rate to allow the indirect detection of dark matter through an anomalous contribution to the cosmic positron flux. In this paper we discuss the implications of the excess in the positron fraction recently reported by the PAMELA collaboration for the scenario of decaying dark matter. To this end, we have performed a model-independent analysis of possible signatures by studying various decay channels in the case of both a fermionic and a scalar dark matter particle. We find that the steep rise in the positron fraction measured by PAMELA at energies larger than 10 GeV can naturally be accommodated in several realizations of the decaying dark matter scenario.

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