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2008

Decaying Dark Matter and the PAMELA Anomaly

Ibarra, Alejandro, Tran, David

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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.

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