Ponente
Descripción
Lorentz invariance violation (LIV) is a speculated consequence of some models of quantum gravity. It is modelled as a modified dispersion relation of massless particles. One direct effect of LIV is energy-dependent photon group velocity. This hypothesis is tested by measuring time delays in the arrival of high-energy photons from astrophysical sources. Suitable targets are variable, distant and highly energetic sources, such as pulsars, gamma-ray bursts (GRBs), and flaring active galactic nuclei (AGN). However, a major challenge arises from possible intrinsic energy-time correlation due to source-specific emission processes. To improve the precision of these measurements and distinguish potential LIV-induced delays from intrinsic effects, a collaborative effort has been established among major Imaging Atmospheric Cherenkov Telescopes (IACTs): H.E.S.S., MAGIC, VERITAS, and the first Large-Sized Telescope (LST-1) of CTAO. The Gamma-ray LIV Working Group (γLIV WG) combines observational data from multiple types of sources, enhancing the sensitivity and robustness of LIV searches. We present the first results on the LIV energy scale derived from a combination of real data from IACT experiments.
