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WHAT COULD WE LEARN FROM A SHARPLY FALLING POSITRON FRACTION?
Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC). Université Pierre and Marie Curie, France; Université de Savoie, France.
2014 (English)In: Astrophysical Journal, ISSN 0004-637X, E-ISSN 1538-4357, Vol. 794, no 2, 168- p.Article in journal (Refereed) Published
Abstract [en]

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 toward 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. Were a sharp steepening to be found, rather surprisingly, we conclude that pulsar models would do at least as well as dark matter scenarios in terms of accounting for any spectral cut-off.

Place, publisher, year, edition, pages
2014. Vol. 794, no 2, 168- p.
Keyword [en]
acceleration of particles, astroparticle physics, cosmic rays, dark matter, ISM: supernova remnants
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:su:diva-109266DOI: 10.1088/0004-637X/794/2/168ISI: 000343085800072OAI: oai:DiVA.org:su-109266DiVA: diva2:765150
Note

AuthorCount:3;

Available from: 2014-11-21 Created: 2014-11-17 Last updated: 2017-12-05Bibliographically approved

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Delahaye, Timur
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