Basics of Superluminal Signals
G. Nimtz, A. Haibel
Abstract
The paper elucidates the physical basis of experimental results on superluminal signal velocity. It will be made plausible that superluminal signals do not violate the principle of causality but they can shorten the luminal vacuum time span between cause and effect. This amazing behaviour is based on the property that any physical signal has a finite duration.
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