The PAMELA excess int the light of cosmic ray propagation
Laboratoire d'Annecy-le-Vieux de Physique Théorique (LAPTH)
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Abstract
The positron excess measured by PAMELA may be the long waited hint of the presence of dark matter particles in the Milky Way halo. But before we rejoice, we need to examine the other Possible astrophysical explanations. Whatever the sources -- DM or conventional -- a crucial ingredient is the transport of cosmic rays in the magnetic fields of the Galaxy to which I will pay particular attention in this presentation.