Gravitino decay and the cosmic gamma-ray background

It is argued that the cosmic gamma-ray background (CGB) spectrum does not exhibit evidence for the decay of light gravitinos, in contradiction to the suggestion by Olive and Silk (1985), who observed a bump near 1 MeV in the CGB radiation spectrum. It is suggested that better fits to the CGB spectru...

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Bibliographic Details
Published in:Physical review letters 1986-06, Vol.56 (23), p.2551-2551
Main Author: Stecker, F. W.
Format: Article
Language:English
Subjects:
Space Radiation
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Summary:It is argued that the cosmic gamma-ray background (CGB) spectrum does not exhibit evidence for the decay of light gravitinos, in contradiction to the suggestion by Olive and Silk (1985), who observed a bump near 1 MeV in the CGB radiation spectrum. It is suggested that better fits to the CGB spectrum would be provided by mechanisms generating a power-law spectrum which is flattened below about 2 MeV. Olive and Silk maintain that the decays of a long-lived particle such as the gravitino may be responsible for features in the gamma-ray spectrum near 1 MeV.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.56.2551