Editing Roman ring (section)

{{short description|Configuration of wormholes}}
{{About|the physics concept|the gymnastics apparatus|Rings (gymnastics)}}

In [[general relativity]], a '''Roman ring''' (proposed by [[Matt Visser]] in 1997<ref>{{cite journal | author=Visser, Matt| title= Traversable wormholes: the Roman ring | arxiv=gr-qc/9702043 | doi=10.1103/PhysRevD.55.5212 | volume=55 | journal=Physical Review D | year= 1997 | issue= 8 | pages=5212–5214| bibcode=1997PhRvD..55.5212V| s2cid= 2869291 }}</ref> and named after the '''Roman arch'''<!--boldface per WP:R#PLA-->, a concept proposed by [[Mike Morris (physicist)|Mike Morris]] and [[Kip Thorne]] in 1988 and named after physicist [[Tom Roman]])<ref>{{cite journal | author = Morris M. S., Thorne K. S. | year = 1988 | title = Wormholes in spacetime and their use for interstellar travel: A tool for teaching general relativity | url = https://archive.org/details/pdfy--5NLGQyfpB61dmyG | journal = Am. J. Phys. | volume = 56 | issue = 5 | page = 395 | doi=10.1119/1.15620| bibcode = 1988AmJPh..56..395M | doi-access = free }}</ref> is a configuration of [[wormhole]]s where no subset of wormholes is near to [[chronology violation]], though the combined system can be arbitrarily close to chronology violation.