Positron Propagation and Fluxes from Neutralino Annihilation in the Halo

Details Positron Propagation and Fluxes from Neutralino Annihilation in the Halo Positron Propagation and Fluxes from Neutralino Annihilation in the Halo

1998-08-21

arxiv.org/abs/astro-ph/9808243v1

Phys.Rev.D59:023511,1998

Astronomy and Astrophysics

Astrophysics

16 pages, 19 figures, uses revtex

Scientific paper

10.1103/PhysRevD.59.023511

Supersymmetric neutralinos are one of the most promising candidates for the dark matter in the Universe. If they exist, they should make up some fraction of the Milky Way halo. We investigate the fluxes of positrons expected at the Earth from neutralino annihilation in the halo. Positron propagation is treated in a diffusion model including energy loss. The positron source function includes contributions from both continuum and monochromatic positrons. We find that, for a "canonical" halo model and propagation parameters, the fluxes are generally too low to be visible. Given the large uncertainties in both propagation and halo structure, it is however possible to obtain observable fluxes. We also investigate the shapes of the positron spectra, including fits to a feature indicated by the results of the HEAT experiment.

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