Possible causes of a rise with energy of the cosmic ray positron fraction

Details Possible causes of a rise with energy of the cosmic ray positron fraction Possible causes of a rise with energy of the cosmic ray positron fraction

2008-10-27

arxiv.org/abs/0810.4846v3

Phys.Rev.D79:021302,2009

Physics

High Energy Physics

High Energy Physics - Phenomenology

4 pages, 1 figure; minor changes, a few references added, matches published version

Scientific paper

10.1103/PhysRevD.79.021302

Based on general considerations rather than model-dependent fits to specific scenarios, we argue that an increase with energy of the positron fraction in cosmic rays, suggested by several experiments at E>~7 GeV, most likely requires a primary source of electron-positron pairs. We discuss the possible alternatives, and find none of them plausible on astrophysical or particle physics grounds. Further observational ways to test different scenarios are discussed.

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