102 citations · 350 across the 10 of their papers we have counts for
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Ultrahigh-energy cosmic-ray bounds on nonbirefringent modified-Maxwell theory
F. R. Klinkhamer, M. Risse
A particularly simple Lorentz-violating modification of the Maxwell theory of photons maintains gauge invariance, CPT, and renormalization. This modified-Maxwell theory, coupled to…
Geometry reconstruction of fluorescence detectors revisited
D. Kuempel, K. -H. Kampert, M. Risse
The experimental technique of fluorescence light observation is used in current and planned air shower experiments that aim at understanding the origin of ultra-high energy cosmic…
Search for ultra-high energy photons using air showers
Markus Risse, Piotr Homola
The observation of photons with energies above 10^18 eV would open a new window in cosmic-ray research, with possible impact on astrophysics, particle physics, cosmology and fundam…
An upper limit to photons from first data taken by the Pierre Auger Observatory
Markus Risse
Many models for ultra-high energy cosmic rays postulate exotic scenarios to explain the sources or the nature of these particles. A characteristic feature of these models is the pr…