PeterDonis
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DrStupid said:I'm stipulating, that a light ray could reach B from A, not going throuth the warp bubble.
Then there is no "violation of causality" even in the (mistaken) sense you are using the term, since events A and B can be connected by light rays in the absence of any warp bubble, so even "causality in the flat parts of the spacetime" is not violated (that would require events A and B to not be connected by any timelike or null paths that do not go through the warp bubble).