A5107357718- Astrophysics and Cosmic Phenomena
- Dark Matter and Cosmic Phenomena
- Particle physics theoretical and experimental studies
- Neutrino Physics Research
- Radio Astronomy Observations and Technology
- Noncommutative and Quantum Gravity Theories
- Corporate Governance and Law
- Gamma-ray bursts and supernovae
- Radiation Therapy and Dosimetry
- Black Holes and Theoretical Physics
- Cosmology and Gravitation Theories
- High-Energy Particle Collisions Research
- Precipitation Measurement and Analysis
- Particle Detector Development and Performance
- Corporate Taxation and Avoidance
- Taxation and Legal Issues
- Atmospheric aerosols and clouds
- Solar and Space Plasma Dynamics
- Atmospheric Ozone and Climate
- Pulsars and Gravitational Waves Research
- Radiation Detection and Scintillator Technologies
- Radio Wave Propagation Studies
- Neuroblastoma Research and Treatments
- Ionosphere and magnetosphere dynamics
- Particle Accelerators and Free-Electron Lasers
University of Siegen
2017-2025
Folkwang University of the Arts
2017-2025
Pierre Auger Observatory
2021-2023
University of Buenos Aires
2011-2023
Consejo Nacional de Investigaciones Científicas y Técnicas
2011-2023
Instituto de Tecnologías en Detección y Astropartículas
2021-2023
National Technological University
2021-2023
Universidad Nacional de La Plata
2011-2023
Institute of Astronomy and Space Physics
2021-2023
Karlsruhe Institute of Technology
1999-2023
A particularly simple Lorentz-violating modification of the Maxwell theory photons maintains gauge invariance, $CPT$, and renormalization. This modified theory, coupled to standard Dirac particles, involves 19 dimensionless ``deformation parameters.'' Ten these parameters lead birefringence are already tightly constrained by astrophysics. New bounds on remaining nine nonbirefringent can be obtained from absence vacuum Cherenkov radiation for ultrahigh-energy cosmic rays (UHECRs). Using...
Nonbirefringent modified-Maxwell theory, coupled to standard Dirac particles, involves nine dimensionless parameters, which can be bounded by the inferred absence of vacuum Cherenkov radiation for ultrahigh-energy cosmic rays (UHECRs). With selected UHECR events, two-sided bounds on eight nonisotropic parameters are obtained at ${10}^{\ensuremath{-}18}$ level, together with an improved one-sided bound single isotropic parameter ${10}^{\ensuremath{-}19}$ level.
A new method to derive an upper limit on photon primaries from small data sets of air showers is developed which accounts for shower properties varying with the primary energy and arrival direction. Applying this highest-energy recorded by AGASA experiment, fraction 51% (67%) at a confidence level 90% (95%) energies above $1.25\ifmmode\times\else\texttimes\fi{}{10}^{20}\text{ }\text{ }\mathrm{eV}$ set. This Greisen-Zatsepin-Kuzmin cutoff constrains $Z$-burst model origin cosmic rays.
Using the large hadron calorimeter of KASCADE experiment, hadronic cores extensive air showers have been studied. The lateral and energy distributions investigated in order to study reliability shower simulation program CORSIKA with respect particle transport, decays, treatment low-energy particles, etc. A good description data has found at distances from core for several interaction models. inner part distribution, on other hand, reveals pronounced differences among Several observables are...
In extensive air showers induced by ultrahigh energy (UHE) cosmic rays, secondary particles are produced with energies far above those accessible other means. These extreme can be used to search for new physics. We study the effects of isotropic, nonbirefringent Lorentz violation in photon sector. case a velocity smaller than maximum attainable standard Dirac fermions, vacuum Cherenkov radiation becomes possible. Implementing this Lorentz-violating effect air-shower simulations, significant...
The Global Cosmic-ray Observatory (GCOS) is a proposed large-scale observatory for studying ultra-high-energy cosmic particles, including rays (UHECRs), photons, and neutrinos. Its primary goal to characterise the properties of highest-energy particles in Nature with unprecedented accuracy, identify their elusive sources. With an aperture at least ten-fold larger than existing observatories, this next-generation facility should start operating after 2030, when present-day detectors will...
Cosmic rays have extremely high particle energies (up to $1{0}^{20}\text{ }\text{ }\mathrm{eV}$) and can be used search for violations of Lorentz invariance. We consider isotropic nonbirefringent violation in the photon sector case a velocity larger than maximum attainable standard fermions. Up now, Earth-based bounds on this type been determined from observations TeV gamma rays. Here, we elaborate novel approach test invariance with greatly improved sensitivity. This is based investigating...
We consider a theory with isotropic nonbirefringent Lorentz violation in the photon sector and explore effects on development of electromagnetic component extensive air showers Earth atmosphere. Specifically, we case ``fast'' phase velocity larger than maximum attainable massive Dirac fermion (this corresponds to negative Lorentz-violating parameter $\ensuremath{\kappa}$ action). Shower photons above-threshold energies decay promptly into electron-positron pairs, instead decaying by...
In extensive air showers induced by ultrahigh-energy (UHE) cosmic rays, secondary photons are expected to be produced at energies far above those accessible other means. It has been shown that the decay of such photons, as possible in certain theories allowing Lorentz violation, can lead significant changes shower development. Based on observations average depth maximum $⟨{X}_{\mathrm{max}}⟩$, a stringent bound violation placed previous work. Here we include shower-to-shower fluctuations...
In extensive air showers induced by ultra-high energy (UHE) cosmic rays, secondary particles are produced with energies far above those accessible other means. These extreme can be used to search for new physics. We study the effects of isotropic, nonbirefringent Lorentz violation in photon sector. case a velocity smaller than maximum attainable standard Dirac fermions, vacuum Cherenkov radiation becomes possible. Implementing this Lorentz-violating effect shower simulations, significant...
The dependence of atmospheric conditions on altitude and time have to be known at the site an air shower experiment for accurate reconstruction extensive showers their simulations. height-profile depth is particular interest as it enters directly into longitudinal development primary energy mass cosmic rays. For southern part Auger Observatory, atmosphere has been investigated in a number campaigns with meteorological radio soundings continuous measurements ground-based weather stations....
Some general properties of extensive air showers are discussed. The main focus is put on the longitudinal development, in particular energy flow, and lateral distribution different shower components. intention paper to provide a basic introduction subject rather than comprehensive review.