Have we seen dark matter annihilation in the cosmic-ray electron and positron spectra

Details Have we seen dark matter annihilation in the cosmic-ray electron and positron spectra Have we seen dark matter annihilation in the cosmic-ray electron and positron spectra

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010sf2a.conf..369l&link_type=abstract

SF2A-2010: Proceedings of the Annual meeting of the French Society of Astronomy and Astrophysics. Eds.: S. Boissier, M. Heydari-

Astronomy and Astrophysics

Astrophysics

Dark Matter, Cosmic-Ray Propagation, Cosmic-Ray Sources, Pulsars, Supernova Remnants

Scientific paper

Measurements of a rise in the cosmic positron fraction up to ˜ 100 GeV by the PAMELA satellite have triggered putative interpretation attempts in terms of dark matter (DM) annihilation or decay, even though generic DM particle models are not expected to contribute to this signal. Here, we review the tricks that have been invoked to make DM-induced signals fit the data. We also recall how considering conventional astrophysical sources --- supernova remnants (SNRs) and pulsars --- in a consistent cosmic-ray (CR) propagation framework can easily explain these observations, despite large theoretical uncertainties. Although this does not dismiss potential DM contributions, this unfortunately makes the related background far too difficult to control for discovery purposes. Though the positron puzzle appears qualitatively solved in terms of standard astrophysics, substantial improvements in the CR source and propagation modelings are now clearly necessary to improve our understanding of the Galactic CR lepton budget and associated multi-wavelength diffuse emissions.

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