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arXiv · 0810.4846

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

Pasquale Dario Serpico
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Abstract

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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Pasquale Dario Serpico. 2009-01-20. Possible causes of a rise with energy of the cosmic ray positron fraction. https://doi.org/10.1103/physrevd.79.021302

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