engleski

Recent limits on Lorentz invariance violation using gamma rays

Certain candidates for the theory of quantum gravity allow violation or deformation of the Lorentz symmetry. This phenomenon, usually referred to as Lorentz invariance violation (LIV), is often modelled by introducing energy-dependent corrections to the standard photon dispersion relation. Modifying terms are expected to be significant at the scale of the Planck energy, and affect photon propagation and interaction. Unfortunately, these effects are vastly below sensitivities of present-day laboratories. However, gamma rays of very high energies, commonly emitted from astrophysical sources, cover astronomical distances on their way to Earth. During this time, the minuscule effects of LIV could sufficiently accumulate to be measured in gamma-ray observatories. In this talk, possible effects of LIV on gamma rays will be reviewed, as well as recent attempts at measuring them. The usual methods of data analysis for tests of LIV will be presented. We will compare and comment on the most prominent results.

Lorentz invariance violation (LIV), very high energy gamma rays

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