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Has anyone actually proven no violation of causality? Wikipedia seemed to suggest that it's not physically impossible to have a wormhole, take one of the ends on a round trip so that it doesn't age as much, and you'd be left with a situation where you can go in one end and come out in the past.
No—“no violation of causality” isn’t a physical law that can be formulated, much less proven. It’s just our intuitive feeling that anything physically possible should also be comprehensible.