Cosmic horizon for GeV sources and photon-photon scattering
arXiv:1801.02368 · doi:10.1007/s10509-018-3247-8
Abstract
Photon-photon scattering of gamma-rays on the cosmic microwave background has been studied using the low energy approximation of the total cross section by Zdziarski & Svensson (1989); Svensson & Zdziarski (1990). Here, the cosmic horizon due to photon-photon scattering is accurately determined using the exact cross section and we find that photon-photon scattering dominates over the pair production at energies smaller than 1.68 GeV and at redshifts larger than 180.
Accepted for publication in Astrophysics and Space Science