As a matter of fact, not
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Posted by DickT on September 04, 2002 at 09:57:20:
In Reply to: M Physics 21:- FTL is a Causal violation only if Speed of Light is equal to the absolute upper speed limit of all Cosmic Entities , including the speed of Cosmic expansion posted by kx21 on September 04, 2002 at 07:11:49:
kx21, c doesn't have to be the upper limit of cosmic expansion (it isn't) for FTL to produce causal violations. For example the Alcubierre metric engineering solution of EFE uses the same space expanding mechanism as cosmic expansion to achieve FTL travel, and it has been shown to violate causality in the usual FTL way. Indeed the causal violation proofs are insensitive to the way you achieve FTL, all they require is that you get from event A to spacially related event B (which is how they say "FTL"). Regards,
Dick
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