I think we're on the same page, then. Or at least close to it. > Does that warping also fix causality? I'd want to see that proven, not just assume that it ma

I think we're on the same page, then. Or at least close to it. > Does that warping also fix causality? I'd want to see that proven, not just assume that it magically does so. Fair. My impression is that it does fix causality, since the warping eliminates the need to (locally) move at relativistic speeds (and therefore reduces any time dilation to negligibility, and thus the opportunities for retrocausality). So I guess I'm more coming at it from the opposite direction: that if any superluminal communication violates causality (which seems to be a common assertion, both in this thread and elsewhere), then I'd want to see that proven, rather than assume it does so. At most, what I can gather is that it's mathematically possible to construct a warp bubble capable of backwards time travel, just like how it's mathematically possible to construct a wormhole that can do so; when you're mangling spacetime, that obviously opens the door for all sorts of wacky shenanigans. Possibility != certainty, though, and various online discussions (including this one) feature folks who seem to assert that all FTL travel/communication must violate causality, which leaves me wondering why - especially when, to your point, plugging the relevant numbers into the Lorentz transformation doesn't transform anything (no local movement, so v = 0, so the Lorentz factor becomes 1, and vx/c^2 = 0, therefore no time dilation - is that math right?). There's also Hawking's chronology protection conjecture. Yeah, just a conjecture, so it can obviously be disproven at some point, but from what I understand string theory seems to support it (reading the relevant papers is on my TODO list). In any case, thanks again. I don't feel like I'm closer to a definitive answer, but at least I'm left with more to think about.