Diffuse cosmic gamma-ray background as a probe of cosmological gravitino regeneration and decay

Keith A. Olive; Joseph Silk

doi:10.1103/PhysRevLett.55.2362

Diffuse cosmic gamma-ray background as a probe of cosmological gravitino regeneration and decay

Keith A. Olive, Joseph Silk

Physics and Astronomy (Twin Cities)

Research output: Contribution to journal › Article › peer-review

31 Scopus citations

Abstract

We predict the presence of a spectral feature in the isotropic cosmic gamma-ray background associated with gravitino decays at high red shifts. With a gravitino abundance that falls in the relatively narrow range expected for thermally regenerated gravitinos following an inflationary epoch in the very early universe, gravitinos of mass several gigaelectronvolts are found to yield an appreciable flux of 110-MeV diffuse gamma rays.

Original language	English (US)
Pages (from-to)	2362-2365
Number of pages	4
Journal	Physical Review Letters
Volume	55
Issue number	21
DOIs	https://doi.org/10.1103/PhysRevLett.55.2362
State	Published - Jan 1 1985

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abstract = "We predict the presence of a spectral feature in the isotropic cosmic gamma-ray background associated with gravitino decays at high red shifts. With a gravitino abundance that falls in the relatively narrow range expected for thermally regenerated gravitinos following an inflationary epoch in the very early universe, gravitinos of mass several gigaelectronvolts are found to yield an appreciable flux of 110-MeV diffuse gamma rays.",

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AB - We predict the presence of a spectral feature in the isotropic cosmic gamma-ray background associated with gravitino decays at high red shifts. With a gravitino abundance that falls in the relatively narrow range expected for thermally regenerated gravitinos following an inflationary epoch in the very early universe, gravitinos of mass several gigaelectronvolts are found to yield an appreciable flux of 110-MeV diffuse gamma rays.

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Diffuse cosmic gamma-ray background as a probe of cosmological gravitino regeneration and decay

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