Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...249....1g&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 249, no. 1, Sept. 1991, p. 1-4. Research supported by University of California
Astronomy and Astrophysics
Astrophysics
11
Cosmic X Rays, Cosmology, Dark Matter, Elementary Particles, Gamma Rays, Particle Mass, Energy Spectra, Supersymmetry, Weak Energy Interactions
Scientific paper
The possibility that cosmological photino annihilation is caused by the extragalactic gamma-ray background (EGB) is examined with particular attention given to the lightest supersymmetric particle (LSP). The LSP is considered a general type of the best-motivated candidates for cosmic dark matter (CDM). The theoretical analysis employs a corrected assumption for the annihilation cross section, and cosmological integrations are performed through the early phases of the universe. Romberg's method is used for numerical integration, and the total optical depth is developed for the gamma-ray region. The computed LSP-type annihilation fluxes are found to be negligible when compared to the total EGB observed, suggesting that the LSP candidates for CDM are not significant contributors to the EGB.
Cline David. B.
Gao Yi-Tian
Stecker Floyd W.
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