International School of Cosmic Ray Astrophysics

16^th  Course: "Gamma Ray and Cosmic Ray Astrophysics: From below GeV to beyond EeV Energies"

 5-12 July 2008
Ettore Majorana Centre
Erice, Sicily, Italy

Topic: Propagation of Ultrahigh Energy Cosmic rays in the Universe
Lecturer: Todor Stanev

We define the interaction processes of ultrahigh energy nuclei in the photon fields of the Universe and follow the development of the cosmic ray spectrum as a function of the redshift of the cosmic ray source. We also present the production of secondary neutrino and photon spectra resulting from such interactions.