zealo wrote:theory is that objects with a velocity higher than c have a negative time component right?
Herman wrote:I've read that you can time travel with a garden-variety rotating black hole, by using frame dragging to accelerate to a speed greater than c with respect to a faraway observer, while still traveling at less than c in the rotating frame. This allows you to travel back in time. Is that right?
I've also heard of the Alcubierre metric, Krasnikov tubes, the Tipler cylinder, and, of course, wormholes.gmalivuk wrote:I have heard of two specific solutions. One is if the entire universe were rotating. I believe this is the GÃ¶del metric. The other involves rotating cosmic strings (i.e. long, stringy black holes) around each other, creating closed timelike curves in the vicinity of where they pass.
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