In general relativity, a Roman ring (proposed by Matt Visser in 1997[1] and named after the Roman arch, a concept proposed by Mike Morris and Kip Thorne in 1988 and named after physicist Tom Roman)[2] is a configuration of wormholes where no subset of wormholes is near to chronology violation, though the combined system can be arbitrarily close to chronology violation.
- ^ Visser, Matt (1997). "Traversable wormholes: the Roman ring". Physical Review D. 55 (8): 5212–5214. arXiv:gr-qc/9702043. Bibcode:1997PhRvD..55.5212V. doi:10.1103/PhysRevD.55.5212. S2CID 2869291.
- ^ Morris M. S., Thorne K. S. (1988). "Wormholes in spacetime and their use for interstellar travel: A tool for teaching general relativity". Am. J. Phys. 56 (5): 395. Bibcode:1988AmJPh..56..395M. doi:10.1119/1.15620.
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