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We examine the electromagnetic radiation produced by a moving charge in theQED vacuum that behaves as a dispersive medium characterized by a geometricalstructure (discreteness/granularity) that emerges from loop quantum gravity. Itis shown that the radiation is driven by the refractive vacuum the chargedparticle travels through reproducing the profile of the Cherenkov effect.

Gambini-Pullin Electrodynamics as a scenario for Cherenkov radiation in QED vacuum