Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-04-19
Phys.Rev.D76:083506,2007
Astronomy and Astrophysics
Astrophysics
13 pages, 9 figures, minor changes, version accepted for publication in PRD
Scientific paper
10.1103/PhysRevD.76.083506
The annihilation of dark matter (DM) in the Galaxy could produce specific imprints on the spectra of antimatter species in Galactic cosmic rays, which could be detected by upcoming experiments such as PAMELA and AMS02. Recent studies show that the presence of substructures can enhance the annihilation signal by a "boost factor" that not only depends on energy, but that is intrinsically a statistical property of the distribution of DM substructures inside the Milky Way. We investigate a scenario in which substructures consist of $\sim 100$ "mini-spikes" around intermediate-mass black holes. Focusing on primary positrons and antiprotons, we find large boost factors, up to a few thousand, that exhibit a large variance at high energy in the case of positrons and at low energy in the case of antiprotons. As a consequence, an estimate of the DM particle mass based on the observed cut-off in the positron spectrum could lead to a substantial underestimate of its actual value.
Bertone Gianfranco
Brun Pierre
Lavalle Julien
Salati Pierre
Taillet Richard
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