[ExI] Faster than light??

[Dennis May]

scerir wrote"
 
> Faster-than-c signals, special relativity, and causality
> http://arxiv.org/abs/gr-qc/0107091
>Stefano Liberati, Sebastiano Sonego, Matt Visser

>Abstract: Motivated by the recent attention on superluminal phenomena, we investigate
> the compatibility between faster-than-c propagation and the fundamental principles of
> relativity and causality. We first argue that special relativity can easily accommodate --
> indeed, does not exclude -- faster-than-c signalling at the kinematical level. As far as
> causality is concerned, it is impossible to make statements of general validity, without
> specifying at least some features of the tachyonic propagation. We thus focus on the
> Scharnhorst effect (faster-than-c photon propagation in the Casimir vacuum), which is
> perhaps the most plausible candidate for a physically sound realization of these
> phenomena. We demonstrate that in this case the faster-than-c aspects are 'benign' and
> constrained in such a manner as to not automatically lead to causality violations.

The orthodox view could be that neutrinos are traveling at true vacuum speed because
they do not interact with the E&M portions of vacuum in the same manner that photons
do.
 
Dennis May
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