Roman ring

This article is about the physics concept. For the gymnastics apparatus, see Rings (gymnastics).

In general relativity, a Roman ring (proposed by Matt Visser in 1997 and named after the Roman arch, a concept proposed by Mike Morris and Kip Thorne in 1988 and named after physicist Tom Roman) is a configuration of wormholes where for each individual wormhole the time difference across its mouths (caused by the mouths moving relative to each other) is such that it may not allow a closed timelike curve (CTC), or 'closed time loop', but if these wormholes are arranged in a suitable configuration, a closed time loop is formed.

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