| Gamma-ray Constraint on galactic positron production by MeV dark matter. | |
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MedLine Citation:
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PMID: 15904276 Owner: NLM Status: PubMed-not-MEDLINE |
Abstract/OtherAbstract:
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The Galactic positrons, as observed by their annihilation gamma-ray line at 0.511 MeV, are difficult to account for with astrophysical sources. It has been proposed that they are produced instead by dark matter annihilation or decay in the inner Galactic halo. To avoid other constraints, these processes are required to occur "invisibly," such that the eventual positron annihilation is the only detectable signal. However, electromagnetic radiative corrections to these processes inevitably produce real gamma rays ("internal bremsstrahlung"); this emission violates COMPTEL and EGRET constraints unless the dark matter mass is less than about 20 MeV. |
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Authors:
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John F Beacom; Nicole F Bell; Gianfranco Bertone |
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Publication Detail:
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Type: Journal Article Date: 2005-05-05 |
Journal Detail:
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Title: Physical review letters Volume: 94 ISSN: 0031-9007 ISO Abbreviation: Phys. Rev. Lett. Publication Date: 2005 May |
Date Detail:
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Created Date: 2005-05-20 Completed Date: 2005-10-03 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 0401141 Medline TA: Phys Rev Lett Country: United States |
Other Details:
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Languages: eng Pagination: 171301 Citation Subset: - |
Affiliation:
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Department of Physics, The Ohio State University, Columbus, Ohio 43210, USA. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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