Astrophysical models for the origin of the positron "excess"

Details Astrophysical models for the origin of the positron "excess" Astrophysical models for the origin of the positron "excess"

2011-08-24

arxiv.org/abs/1108.4827v1

Astronomy and Astrophysics

Astrophysics

High Energy Astrophysical Phenomena

15 pages (147 references), 2 figures: review article for a Topical Issue on Cosmic Rays, accepted for publication in Astropart

Scientific paper

Over the last three years, several satellite and balloon observatories have suggested intriguing features in the cosmic ray lepton spectra. Most notably, the PAMELA satellite has suggested an "anomalous" rise with energy of the cosmic ray positron fraction. In this article, we summarize the global picture emerging from the data and recapitulate the main features of different types of explanations proposed. The perspectives in testing different scenarios as well as inferring some astrophysical diagnostics from current/near future experiments are also discussed.

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