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- W2163561657 abstract "I investigate the relationship between faster-than-light travel and weak-energy-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 neighboring path. With this definition (and assuming the generic condition) I prove that superluminal travel requires weak-energy-condition violation." @default.
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- W2163561657 date "1998-10-26" @default.
- W2163561657 modified "2023-10-02" @default.
- W2163561657 title "Superluminal Travel Requires Negative Energies" @default.
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- W2163561657 doi "https://doi.org/10.1103/physrevlett.81.3567" @default.
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