Propagation of gamma-rays at cosmological redshifts

Details Propagation of gamma-rays at cosmological redshifts Propagation of gamma-rays at cosmological redshifts

Aug 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989nuphs..10...81z&link_type=abstract

Nuclear Physics B Proceedings Supplements, Volume 10, Issue 2, p. 81-87.

Physics

Nuclear Physics

2

Scientific paper

We discuss absorption and reprocessing of γ-rays at cosmological redshifts. We consider Compton scattering and pair production by γ-rays on the cosmic baryonic matter, and photon-photon scattering and photon-photon pair production by γ-rays and Compton scattering of relativistic pairs on the cosmic blackbody background. We point out the cosmological importance of photon-photon scattering (a process not previously considered in astrophysics). We determine the region where the universe is transparent to γ-rays and the regions of dominance of the elementary processes on the photon-energy-redshift plane. We discuss the current status of this field of research and its future directions. The problem of cosmological γ-ray reprocessing is relevant, e.g., for observational γ-ray astronomy, for which the signatures of the cosmological origin need to be determined, and for studies of the effects that pair cascades, caused by the decay of unstable particles from a hot Big Bang, have on the primordial nucleosynthesis.

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