Quote:
Originally Posted by Astromancer
In order for the Alcubierre Warp to be stable, measures must be taken that prevent the possibility of backwards time travel.
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Anything that is FTL travel according to any inertial frame of reference is already travel backwards in time according to other, equally valid, frames of reference.
The reason that Alcubierre warps do not produce closed timelike paths is that their interiors are causally disconnected from the rest of spacetime. Nothing that was ever outside can get inside, and nothing that was ever inside can get outside, ever.