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Recent results on LIV studies using the MAGIC telescopes

Certain candidates for the theory of quantum gravity predict a non-trivial dispersion relation for photons, an effect dubbed Lorentz Invariance Violation (LIV). As a consequence, the speed of photons may depend on their energy. This tiny effect might be accumulated for very high energy (VHE, E > 100 GeV) photons crossing cosmological distances, resulting in a different time-of-flight (ToF) compared to low energy photons, presumably emitted simultaneously at the source. Using a flare from the blazar Mrk 421 detected by the Major Atmospheric Gamma Imaging Cherenkov (MAGIC) telescopes in 2014, we set the strongest limits so far on the quadratic correction for the dispersion relation of the photon using the ToF method. Moreover, the MAGIC Collaboration recently observed for the first time photons above 200 GeV from the gamma-ray burst GRB 190114C. This is by far the highest energy detected from a GRB. Results of a LIV study on these data will be presented as well.

Quantum gravity, Lorentz invariance violation, Very high energy gamma rays, Gamma-ray bursts

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