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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.