We review the possible mechanisms for the generation of cosmological magnetic fields,
discuss their evolution in an expanding Universe filled with the cosmic plasma and provide a …

We present an updated review of Lorentz invariance tests in effective field theories (EFTs) in
the matter as well as in the gravity sector. After a general discussion of the role of Lorentz …

We present the first hybrid measurement of the average muon number in air showers at
ultrahigh energies, initiated by cosmic rays with zenith angles between 62° and 80°. The …

We have searched for intermediate-scale anisotropy in the arrival directions of ultrahigh-
energy cosmic rays with energies above 57 EeV in the northern sky using data collected …

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 …

Abstract The Pierre Auger Observatory, located on a vast, high plain in western Argentina, is
the world׳ s largest cosmic ray observatory. The objectives of the Observatory are to probe …

In this paper we review air shower data related to the mass composition of cosmic rays
above 1015eV. After explaining the basic relations between air shower observables and the …

I review the current status of phenomenological programs inspired by quantum-spacetime
research. I stress in particular the significance of results establishing that certain data …

The origin of the highest energy cosmic rays is still unknown. The discovery of their sources
is expected to reveal the workings of the most energetic astrophysical accelerators in the …

The energy spectrum of cosmic rays above 2.5× 10 18 eV, derived from 20 000 events
recorded at the Pierre Auger Observatory, is described. The spectral index γ of the particle …