$e^\pm$ Excesses in the Cosmic Ray Spectrum and Possible Interpretations

Details $e^\pm$ Excesses in the Cosmic Ray Spectrum and Possible Interpretations $e^\pm$ Excesses in the Cosmic Ray Spectrum and Possible Interpretations

2010-08-27

arxiv.org/abs/1008.4646v1

Astronomy and Astrophysics

Astrophysics

High Energy Astrophysical Phenomena

48 pages, including 10 figures and 1 tabel. Invited review to be published in IJMPD

Scientific paper

The data collected by ATIC, PPB-BETS, FERMI-LAT and HESS all indicate that there is an electron/positron excess in the cosmic ray energy spectrum above $\sim$ 100 GeV, although different instrumental teams do not agree on the detailed spectral shape. PAMELA also reported a clear excess feature of the positron fraction above several GeV, but no excess in anti-protons. Here we review the observational status and theoretical models of this interesting observational feature. We pay special attention to various physical interpretations proposed in the literature, including modified supernova remnant models for the $e^\pm$ background, new astrophysical sources, and new physics (the dark matter models). We suggest that although most models can make a case to interpret the data, with the current observational constraints the dark matter interpretations, especially those invoking annihilation, require much more exotic assumptions than some astrophysical interpretations. Future observations may present some ``smoking-gun'' observational tests to differentiate among different models and to identify the correct interpretation to the phenomenon.

Affiliated with

Also associated with

No associations

Rating

$e^\pm$ Excesses in the Cosmic Ray Spectrum and Possible Interpretations does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with $e^\pm$ Excesses in the Cosmic Ray Spectrum and Possible Interpretations, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and $e^\pm$ Excesses in the Cosmic Ray Spectrum and Possible Interpretations will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-331206