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> You seem happy to throw out causality? but not the faster than light bit.

Nope, going faster than light violates causality. As I have said N times, wormholes do not allow you to go faster than light. I really can't be any clearer on that. What they do is alter the topology of space so that you can create a shorter route between two locations that used to be "far away" in the old topology.




Yes, but if you entering the wormhole at one end and leaving it at the other are events with spacelike separation, then those events have no absolute order, which means that there is at least one frame of reference in which you leave the wormhole before you enter it. That's time-travel, and that raises the possibility of causality violations.


I honestly don't have a clue, but I got the impression it's not so simple as that; e.g. see http://physics.stackexchange.com/a/128085/1174 and similar answers.

do you have any interesting read about the topic ?




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