We review open questions and prospects for progress in ultrahigh-energy cosmic ray
(UHECR) research, based on a series of discussions that took place during the “The High …

In the last fifteen years radio detection made it back to the list of promising techniques for
extensive air showers, firstly, due to the installation and successful operation of digital radio …

The present white paper is submitted as part of the “Snowmass” process to help inform the
long-term plans of the United States Department of Energy and the National Science …

Cosmic rays are atomic nuclei arriving from outer space that reach the highest energies
observed in nature. Clues to their origin come from studying the distribution of their arrival …

A new analysis of the data set from the Pierre Auger Observatory provides evidence for
anisotropy in the arrival directions of ultra-high-energy cosmic rays on an intermediate …

Cosmic rays are observed up to the astounding energies of more than 1020 eV, making
them the most energetic particles known in the universe. However, the origin of these …

The distribution of the arrival directions of cosmic rays (CR) with ultrahigh energies is
expected to play a major role in the quest to unveil the origin of these particles. Hints of …

The Pierre Auger Observatory has begun a major Upgrade of its already impressive
capabilities, with an emphasis on improved mass composition determination using the …

We investigate the possibility that blazars in the Roma-BZCAT Multifrequency Catalogue of
Blazars (5BZCAT) are sources of the high-energy astrophysical neutrinos detected by the …

Radio synchrotron emission, its polarization and Faraday rotation of the polarization angle
are powerful tools to study the strength and structure of magnetic fields in galaxies …