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Recent limits on LIV using gamma rays

On January 14, 2019, the MAGIC telescopes detected GRB 190114C at teraelectronvolt energies, recording the most energetic photons ever observed from a gamma-ray burst. Using this unique observation, we probe energy dependence of the speed of light in vacuo as predicted by several quantum-gravity models. Based on a set of well-justified assumptions on the possible intrinsic spectral and temporal evolution, we obtain competitive lower limits on the quadratic leading order modification of the speed of light. This is the first Lorentz invariance violation (LIV) test ever performed on a gamma-ray burst signal at TeV energies and will serve as a stepping stone to future studies. The results will be put into context of the most stringent bounds on LIV obtained using gamma rays.

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

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