@inproceedings{b3fcba7b415d4aeabc94bbd8bea32cdf,
title = "The positron excess as a smoking gun for dynamical dark matter?",
abstract = "One of the most puzzling aspects of recent data from the AMS-02 experiment is an apparent rise in the cosmic-ray positron fraction as a function of energy. This feature is observed out to energies of approximately 350 GeV. One explanation of these results interprets the extra positrons as arising from the decays of dark-matter particles. This in turn typically requires that such particles have rather heavy TeV-scale masses and not undergo simple two-body decays to leptons. In this talk, by contrast, we show that Dynamical Dark Matter (DDM) can not only match existing AMS-02 data on the positron excess, but also accomplish this feat with significantly lighter dark-matter constituents undergoing simple two-body decays to leptons. We also demonstrate that the Dynamical Dark Matter framework makes a fairly robust prediction that the positron fraction should level off and then remain roughly constant out to approximately 1 TeV, without experiencing any sharp downturns. Thus, if we interpret the positron excess in terms of decaying dark matter, the existence of a plateau in the positron fraction at energies less than 1 TeV may be taken as a {"}smoking gun{"} of Dynamical Dark Matter.",
keywords = "AMS, Dynamical Dark Matter, cosmic ray, flux, positron",
author = "Dienes, {Keith R.} and Jason Kumar and Brooks Thomas",
year = "2014",
doi = "10.1063/1.4883409",
language = "English (US)",
isbn = "9780735412385",
series = "AIP Conference Proceedings",
publisher = "American Institute of Physics Inc.",
pages = "22--33",
booktitle = "Workshop on Dark Matter, Neutrino Physics and Astrophysics, CETUP* 2013 - 7th International Conference on Interconnections between Particle Physics and Cosmology, PPC* 2013",
note = "Workshop on Dark Matter, Neutrino Physics and Astrophysics, CETUP* 2013 and 7th International Conference on Interconnections Between Particle Physics and Cosmology, PPC* 2013 ; Conference date: 24-06-2013 Through 26-07-2013",
}