Ultra High Energy Cosmic Rays Propagation and Spectrum

The status of the observations of Ultra High Energy Cosmic Rays will be reviewed, focusing on the the latest results of HiRes and Auger observatories. A comprehensive analytical computation scheme to compute the expected UHECR spectrum on earth will be presented, applying such scheme to interpret the experimental results. The phenomenological scenarios favored by HiRes and Auger in terms of chemical composition and spectrum will be also presented.Comment: 6 pages, 5 eps figures, invited review talk at the International Symposium on the Recent Progress of Ultra High Energy Cosmic Ray Observation, Nagoya (Japan) Dec 10-12 201

Ultra High Energy Cosmic Rays, Photons and Neutrinos

We briefly review the main channels of gamma ray and neutrino production due to the propagation of ultra high energy cosmic rays. We show how the observations of these secondary radiations are of paramount importance in tagging mass composition and sources of ultra high energy cosmic rays.Comment: 5 pages, 4 pdf figures, invited talk given at the 11th Workshop on Science with the New Generation of High Energy Gamma-ray Experiments (SciNeGHE 2016), 18-21 October 2016, Pisa (Italy). To be published in Nuovo Cimento