Cosmic horizon for GeV sources and photon-photon scattering

  • G. V. VereshchaginEmail author
Original Article


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 and Svensson (Astrophys. J. 344:551, 1989), Svensson and Zdziarski (Astrophys. J. 349:415, 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.


Cosmic rays Background radiation 



I would like to thank the anonymous referee for his/her remarks and suggestions which improved presentation of this paper.


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Authors and Affiliations

  1. 1.ICRANetPescaraItaly
  2. 2.ICRA and Department of PhysicsUniversity of Rome “Sapienza”RomeItaly
  3. 3.ICRANet-MinskNational Academy of Sciences of BelarusMinskBelarus

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