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Chronos
#7
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."
http://math.ucr.edu/home/baez/physic...ht/FTL.html#12

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
http://www.arxiv.org/abs/quant-ph/0004047

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

Testing models for quantum gravity
http://www.cerncourier.com/main/article/42/7/18

Selected topics in Planck-scale physics
http://www.arxiv.org/abs/gr-qc/0305019