We review the physics of the highest energy cosmic rays, i.e. those astrophysical particles with energies larger than 100 PeV, the so-called Ultra High Energy Cosmic Rays (UHECR). We will review the main experimental evidences connected to UHECR and discuss the details of propagation of these high energy particles, their interaction with astrophysical photon backgrounds and the production of...
The origin of the astrophysical neutrino signal detected by IceCube is still mysterious. Several extragalactic sources have been proposed as possible accelerators of the high energy protons (or nuclei) whose interaction with gas or radiation is expected to trigger the neutrino emission. The detection of the well reconstructed event IC-170922A on September 2017, potentially associated with the...
