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 …

Gamma-ray bursts (GRBs) are one of the candidates of ultrahigh-energy (≳ 10 18.5 eV)
cosmic-ray (UHECR) sources. We investigate high-energy cosmic-ray acceleration including …

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

Accretion and merger shocks in clusters of galaxies are potential accelerators of high-
energy protons, which can give rise to high-energy neutrinos through pp interactions with …

We analyze macroscopic effects of TeV-scale black holes, such as could possibly be
produced at the LHC, in what is regarded as an extremely hypothetical scenario in which …

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

Nonbirefringent modified-Maxwell theory, coupled to standard Dirac particles, involves nine
dimensionless parameters, which can be bounded by the inferred absence of vacuum …

This paper provides an analytical description of the transport of ultrahigh energy cosmic rays
in an inhomogeneously magnetized intergalactic medium. The latter is modeled as a …

We study ultra–high-energy cosmic rays (UHECRs) from transient sources, propagating in
the Galactic and intergalactic space. Based on recent observational results, we also …

The Pierre Auger Collaboration has reported a correlation between ultrahigh energy cosmic
rays (UHECR) and nearby active galactic nuclei (AGN) within∼ 75 Mpc. Two of these events …