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SETI public: Negative Energy, Wormholes, and Warp Drive article in Jan. SciAm
It's not online, but here is the summary:
Negative Energy, Wormholes and Warp Drive
Lawrence H. Ford and Thomas A. Roman
Contrary to a popular misconception, Albert Einsteinšs theories
do not strictly forbid either faster-than-light travel or time travel.
In principle, by harnessing the elusive force of negative energy,
one can shorten stellar distances by bending space-time around
would-be star trekkers.