http://arxiv.org/abs/1801.02368
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.
G. Vereshchagin
Tue, 9 Jan 18
60/94
Comments: Accepted for publication in Astrophysics and Space Science