The optical depth of the universe at radiation-dominated epochs

Details The optical depth of the universe at radiation-dominated epochs The optical depth of the universe at radiation-dominated epochs

Oct 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...362...25n&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 362, Oct. 10, 1990, p. 25-32.

Mathematics

Logic

3

Cosmic Rays, Dark Matter, Optical Thickness, Radiation Distribution, Red Shift, Universe, Compton Effect, Pair Production, Relativistic Particles

Scientific paper

If the universe were radiation-dominated at redshifts greater than about 100-1000, e.g., due to the presence of a small fraction of light particles in the dark matter, it would be optically thin in soft gamma-rays up to redshifts of 10,000. This is larger by an order of magnitude than for the matter-dominated universe. X-rays and gamma-rays produced by cosmological high-energy processes are thus potentially observable up to z of about 10,000. Analytical formulas are derived for the optical depths of radiation-dominated universe due to photoionization, Compton scattering, photon-matter pair production, photon-photon scattering, and photon-photon pair production, in interactions with the cosmic thermal background and baryonic matter.

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