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Astroparticle Physics

Antimatter fluxes in the Milky Way

by Michael Kachelriess (Throndeim University, Norway)

Europe/Berlin
Building 67, SemRm 10 (DESY Hamburg)

Building 67, SemRm 10

DESY Hamburg

Description
Measurements of the nuclear composition and of the antimatter fraction of cosmic rays (CR) are a main tool to understand the origin of CRs. If the antimatter fluxes from astrophysical sources can be estimated sufficiently reliable, a search for possible excesses can be used to detect dark matter (DM). After a general introduction, I discuss the suggestion that the re-acceleration of CR secondaries in supernova remnants leads to positron and antiproton ratios increasing with energy. I present also results for the B/C ratio which can be soon tested by the AMS-2 experiment. In the second part of the talk, I review the production of antideuterons, both in DM annihilations and in pp collisions. In the former case, I stress the importance of event-by-event simulations of antideuteron coalescence and discuss the model uncertainties. Finally, I argue that the antideuteron yield especially at low energies is underestimated in commonly used models.