Release 0.4.1 / 20 October 2026
Superluminal Travel Requires Negative Energies
Theoretical constraint: with the paper’s operational definition of superluminal travel and generic condition, weak-energy-condition violation is necessary. Coordinate speed alone is not a physical shortcut.
Citation and scope
Ken D. Olum (1998). Superluminal Travel Requires Negative Energies. Physical Review Letters 81, 3567–3570.
DOI: 10.1103/PhysRevLett.81.3567
Theoretical constraint: with the paper’s operational definition of superluminal travel and generic condition, weak-energy-condition violation is necessary. Coordinate speed alone is not a physical shortcut.
Use in this release
Listed for the specific context or constraint above. A citation is not an endorsement, independent reproduction or evidence for all NetPhysics proposals.