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most citedProbing quantum gravity using photons from a flare of the active galactic nucleus Markarian 501 observed by the MAGIC telescope

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astro-ph.HE2009★ 61 cited

Probing a Possible Vacuum Refractive Index with Gamma-Ray Telescopes

John Ellis, N. E. Mavromatos, D. V. Nanopoulos

We have used a stringy model of quantum space-time foam to suggest that the vacuum may exhibit a non-trivial refractive index depending linearly on gamma-ray energy: eta -1 ~ E_gam…