Interestingly a short while back White's lab did notice a statistically relevant effect regarding one of their candidate warping devices. However, they aren't ready to make any conclusions about the effect that they saw - so far as I understand it's merely a very weak correlation right now. Something interesting, but nobody should get their hopes up.<p>Either way I seriously recommend some thorough Googling about this subject as that article is unbelievably out of date.<p><i>I play Elite: Dangerous once in a while and one thing that game really teaches you is that even 'c' is really slow in astronomical terms. You start to realize that for space colonization to become truly viable we'd have to hope for some real analog of "hyperspace," as "warp" simply won't cut it in the long run.</i>
The article is badly edited, speaking of both "negative density energy" and "negative energy density", when the latter is what was meant.<p>Even though, as I understand it, General Relativity doesn't forbid FTL explicitly, it doesn't get you out of the causality problems of FTL. At least, I've never seen an explanation of a "warp" style FTL method that doesn't allow for causality violation. I'm all ears, if someone wants to convince me that warp drives can't violate causality.