Superluminal travel requires negative energies

@article{Olum1998SuperluminalTR,
  title={Superluminal travel requires negative energies},
  author={K. Olum},
  journal={Physical Review Letters},
  year={1998},
  volume={81},
  pages={3567-3570}
}
  • K. Olum
  • Published 1998
  • Physics
  • Physical Review Letters
  • I investigate the relationship between faster-than-light travel and weakenergy-condition violation, i.e., negative energy densities. In a general spacetime it is difficult to define faster-than-light travel, and I give an example of a metric which appears to allow superluminal travel, but in fact is just flat space. To avoid such difficulties, I propose a definition of superluminal travel which requires that the path to be traveled reach a destination surface at an earlier time than any… CONTINUE READING
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