Changes in extensive air showers from isotropic Lorentz violation in the photon sector

UHECR bounds on Lorentz violation in the photon sector

The aim of this brief review is to present a case study of how bounds on Lorentz-violating parameters can be obtained from astrophysics data. For this purpose, a particularly simple Lorentz-violating modification of the Maxwell theory of photons is considered, which maintains gauge invariance, CPT, and renormalization. With a minimal coupling of the photon to a standard spin– 1 2 Dirac particle...

New Indirect Bounds on Lorentz Violation in the Photon Sector

Direct laboratory bounds on the 9 nonbirefringent Lorentz-violating dimensionless parameters of modified-Maxwell theory range from the 10 level to the 10 level. The detection of air showers initiated by charged primaries (ultrahigh-energy cosmic-rays) and neutral primaries (TeV gamma-rays) allows us to obtain new indirect bounds ranging from the 10 level to the 10 level. Possible physics implic...

Čerenkov Photon Density Fluctuations in Extensive Air Showers

The details of Čerenkov light produced by a γ− ray or a cosmic ray incident at the top of the atmosphere is best studied through systematic simulations of the extensive air showers. Recently such studies have become all the more important in view of the various techniques resulting from such studies, to distinguish γ− ray initiated showers from those generated by much more abundant hadronic com...

for extensive air showers

The new hadronic Monte Carlo model QGSJET-II is applied for extensive air shower (EAS) calculations. The obtained results are compared to the predictions of the original QGSJET and of the SIBYLL 2.1 interaction models. It is shown that non-linear effects change substantially model predictions for hadron-nucleus interactions and produce observable effects for calculated EAS characteristics. Fina...

Limits on Isotropic Lorentz Violation in QED from Collider Physics