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: email@example.com
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.
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