Do Faster-than-Light Group Velocities imply Violation of Causality?

Abstract

>DISCUSSION of the properties of hypothetical systems1–6 in which group velocities exceed the speed of light has considered chiefly whether such systems would violate the axioms of special relativity. In particular they appear at first sight to violate causality.

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FOX, R., KUPER, C. & LIPSON, S. Do Faster-than-Light Group Velocities imply Violation of Causality?. Nature 223, 597 (1969). https://doi.org/10.1038/223597a0

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