Local dark matter clumps and the cosmic ray positron excess

Details Local dark matter clumps and the cosmic ray positron excess Local dark matter clumps and the cosmic ray positron excess

2006-02-14

arxiv.org/abs/astro-ph/0602320v3

Mon.Not.Roy.Astron.Soc.374:455-465,2007

Astronomy and Astrophysics

Astrophysics

Full-effects of diffusion of the positrons in the ISM have now been incorporated. (Submitted to MNRAS)

Scientific paper

10.1111/j.1365-2966.2006.11123.x

It has been proposed that the excess in cosmic ray positrons at approximately 8 GeV, observed on both flights of the 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 estimate the annihilation cross-section for several benchmark minimal supersymmetric (MSSM) models. We also demonstrate the effect on the permitted parameter space as tidal stripping effects and destruction of substructure by mergers becomes increasingly severe.

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