| Issue |
EPJ Web of Conferences
Volume 105, 2015
SuGAR 2015 – Searching for the Sources of Galactic Cosmic Rays
|
|
|---|---|---|
| Article Number | 02003 | |
| Number of page(s) | 4 | |
| Section | Modeling: Particle Acceleration and Propagation | |
| DOI | https://doi.org/10.1051/epjconf/201510502003 | |
| Published online | 08 December 2015 | |
https://doi.org/10.1051/epjconf/201510502003
What can we learn from a sharply falling positron fraction?
1 Oskar Klein Centre for Cosmoparticle Physics, Department of Physics, Stockholm University, 10691 Stockholm, Sweden
2 Institut d'Astrophysique de Paris UMR7095–CNRS, Universit Pierre and Marie Curie, 98 bis Boulevard Arago, 75014 Paris, France
3 Department of Physics and Astronomy, The Johns Hopkins University, 3400 North Charles Street, Baltimore, MD 21218, USA
4 Beecroft Institute of Particle Astrophysics and Cosmology, Department of Physics, University of Oxford, DenysWilkinson Building, 1 Keble Road, Oxford OX1 3RH, UK
a Corresponding author: timur.delahaye@polytechnique.org
Published online: 8 December 2015
Recent results from the AMS-02 data have confirmed that the cosmic ray positron fraction increases with energy between 10 and 200 GeV. This quantity should not exceed 50%, and it is hence expected that it will either converge towards 50% or fall. We study the possibility that future data may show the positron fraction dropping down abruptly to the level expected with only secondary production, and forecast the implications of such a feature in term of possible injection mechanisms that include both Dark Matter and pulsars.
© Owned by the authors, published by EDP Sciences, 2015
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