Positrons from dark matter annihilation in the galactic halo: theoretical uncertainties

Details Positrons from dark matter annihilation in the galactic halo: theoretical uncertainties Positrons from dark matter annihilation in the galactic halo: theoretical uncertainties

2007-12-14

arxiv.org/abs/0712.2312v2

Phys.Rev.D77:063527,2008

Astronomy and Astrophysics

Astrophysics

22 pages, 15 figures. A few comments and references added

Scientific paper

10.1103/PhysRevD.77.063527

Indirect detection signals from dark matter annihilation are studied in the positron channel. We discuss in detail the positron propagation inside the galactic medium: we present novel solutions of the diffusion and propagation equations and we focus on the determination of the astrophysical uncertainties which affect the positron dark matter signal. We find dark matter scenarios and propagation models that nicely fit existing data on the positron fraction. Finally, we present predictions both on the positron fraction and on the flux for already running or planned space experiments, concluding that they have the potential to discriminate a possible signal from the background and, in some cases, to distinguish among different astrophysical propagation models.

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