Local dark matter clumps and the positron excess (original) (raw)

2007, Monthly Notices of the Royal Astronomical Society

It has been proposed that the excess in cosmic ray positrons at approximately 8 GeV, observed on both flights of the High-Energy Antimatter Telescope (HEAT) balloon experiment, may be associated with the annihilation of dark matter within the Milky Way halo. In this paper, we demonstrate how the self-annihilation of neutralino dark matter within local substructure can account for this excess, and we estimate the annihilation cross-section for several benchmark minimal supersymmetric (MSSM) models. We also demonstrate the changes in the permitted parameter space as the effects of tidal disruption become increasingly severe.

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