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Sep4-05, 09:53 PM
Sci Advisor
PF Gold
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P: 9,484
The Scharnhorst effect is, at best, difficult to measure, and deemed unlikely to cause superluminal propogation. To quote John Baez:
"However, further theoretical investigations have shown that once again there is no possibility of FTL communication using this [Scharnhorst] effect."

Several papers disputing the Scharnhorst result were published circa 1990, unfortunately, finding free sources of these papers has proven difficult.

Another source:
Quantum Noise and Superluminal Propagation

Regarding slips in the arrival time of high energy GRB photons:

Testing models for quantum gravity

Selected topics in Planck-scale physics