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 …

Data collected by the Pierre Auger Observatory provide evidence for anisotropy in the arrival
directions of the cosmic rays with the highest-energies, which are correlated with the …

Neutrino oscillations have been found in experiments observing solar and atmospheric
neutrinos. They were confirmed by experiments using neutrinos produced by reactors and …

A method is developed to search for air showers initiated by photons using data recorded by
the surface detector of the Auger Observatory. The approach is based on observables …

There is a unique Lorentz-violating modification of the Maxwell theory of photons, which
maintains gauge invariance, CPT, and renormalizability. Restricting the modified-Maxwell …

The surface detector array of the Pierre Auger Observatory is sensitive to Earth-skimming tau
neutrinos that interact in Earth's crust. Tau leptons from ν τ charged-current interactions can …

We present a new method for the reconstruction of the longitudinal profile of extensive air
showers induced by ultra-high energy cosmic rays. In contrast to the typically considered …

In the last fifteen years, various areas of high energy physics, astrophysics and theoretical
physics have converged on the study of cosmology so that any graduate student in these …

A particularly simple Lorentz-violating modification of the Maxwell theory of photons
maintains gauge invariance, CPT, and renormalization. This modified Maxwell theory …

Based on CORSIKA and REAS2 simulations, we investigate the dependence of
geosynchrotron radio emission from extensive air showers on the energy of the primary …