Double Pair Production by Ultra High Energy Cosmic Ray Photons

Abstract

With use of CompHEP package we've made the detailed estimate of the influence of double e+e- pair production by photons (DPP) on the propagation of ultra high energy electromagnetic cascade. We show that in the models in which cosmic ray photons energy reaches few thousand EeV refined DPP analysis may lead to substantial difference in predicted photon spectrum compared to previous rough estimates.

arXiv comment12 pages, 5 figures (misprints removed, 2 additional figures added in ver. 2)

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• Cosmic absorption of ultra high energy particles
• Electromagnetic cascade masquerade: a way to mimic $\gamma$--axion-like particle mixing effects in blazar spectra
• Propagation of extragalactic photons at ultra-high energy with the EleCa code
• Modification of the mean free path of very high energy photons due to a relativistic deformed kinematics
• Ultra-high energy neutrinos from high-redshift electromagnetic cascades
• Neutrino Production in Electromagnetic Cascades: An extra component of cosmogenic neutrino at ultrahigh energies
• Neutrinos from muon-rich ultra high energy electromagnetic cascades: The MUNHECA code
• Revisiting the propagation of highly-energetic gamma rays in the Galaxy