期刊
INTERNATIONAL JOURNAL OF MODERN PHYSICS D
卷 19, 期 13, 页码 2011-2058出版社
WORLD SCIENTIFIC PUBL CO PTE LTD
DOI: 10.1142/S0218271810018268
关键词
e(+/-) excess; supernova remnants; pulsar; dark matter; particle
资金
- National Basic Research Program of China [2009CB824800]
- Chinese Academy of Sciences
- NASA [NNX09AT66G, NNX10AD48G]
- NSF [AST-0908362]
- Division Of Astronomical Sciences
- Direct For Mathematical & Physical Scien [0908362] Funding Source: National Science Foundation
- NASA [107411, NNX09AT66G] Funding Source: Federal RePORTER
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 similar to 100 GeV, although different instrumental teams do not agree on the detailed spectral shape. PAMELA also reported clearly the excessive feature of the fraction of positron above several GeV, but with no excess in antiprotons. 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(+/-) 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 other astrophysical interpretations. Future observations may present some smoking-gun observational tests to differentiate different models and to identify the correct interpretation of the phenomenon.
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