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The Scharnhorst effect is a hypothetical phenomenon in which light signals travel slightly faster than c between two closely spaced conducting plates. It was first predicted in a 1990 paper by Klaus Scharnhorst of the Humboldt University of Berlin, Germany. He showed using quantum electrodynamics that the effective refractive index n, at low frequencies, in the space between the plates was less than 1. Gabriel Barton and Scharnhorst in 1993 claimed that either signal velocity can exceed c or that the imaginary part of n is negative.
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