Has superluminal light propagation been observed?

Details Has superluminal light propagation been observed? Has superluminal light propagation been observed?

2000-09-10

arxiv.org/abs/physics/0009034v1

Physics

General Physics

4 pages, LaTeX

Scientific paper

It says in the report$^1$ by Wang et al. that a negative group velocity $u=-c/310$ is obtained and that a pulse advancement shift 62-ns is measured. The authors claim that the negative group velocity is associated with superluminal light propagation and that the pulse advancement is not at odds with causality or special relativity. However, it is shown here that their conclusions above are not true. Furthermore, I give some suggestion concerning a re-definition of group-velocity and a new explanation in special relativity of causality.

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