Invited review talk given at the 9th Workshop on Science with the New Generation of High Energy Gamma-ray Experiments, 20-22 June 2012, Lecce (Italy).
http://arxiv.org/abs/1211.2004

For a PDF version of the article, click here.

Abstract: We will review the main physical aspects of Ultra High Energy Cosmic Rays. We will discuss in particular their propagation through astrophysical backgrounds, focusing on the latest experimental observations of HiRes, Telescope Array and Auger. We will also review the issue of the transition between galactic and extra-galactic cosmic rays.

Keywords: Cosmic Rays Theory, Cosmic Rays Observations, Particles Astrophysics, Astrophysical Backgrounds

Table of Contents

• INTRODUCTION
• HIRES AND TA DATA: DIP AND GZK CUT-OFF
• AUGER DATA: HEAVY NUCLEI
• GALACTIC AND EXTRA-GALACTIC COSMIC RAYS
• DISCUSSION AND CONCLUSIONS
• REFERENCES