Quote:
Originally Posted by Prince Charon
The only one that I can think of right this minute (while I'm tired and have a headache and am only posting so that I won't forget to post it later) is real time travel that doesn't involve traveling to a worldline that has an earlier or later 'present.'
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Surely you could just accelerate up to relativistic speeds and travel into the future at a faster rate than normal. And if they have access to exotic matter (i.e. negative mass) you might be able to construct a Tipler cylinder.
Though if you're allowing things like teleportation without time travel, you're probably busting relativity enough to declare that neither of the previous things work either.