EPJ Web of Conferences
Volume 105, 2015SuGAR 2015 – Searching for the Sources of Galactic Cosmic Rays
|Number of page(s)||4|
|Section||Modeling: Particle Acceleration and Propagation|
|Published online||08 December 2015|
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: firstname.lastname@example.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
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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