Roman ring Guide, Meaning , Facts, Information and Description
A wormhole with time difference across its mouths may not allow a closed time loop. If we arrange such wormholes in a suitable configuration, a closed time loop will be again possible. Such a configuration is known as a Roman ring. A Roman ring is a very stable configuration. The chronology protection conjecture postulated by physicist Stephen Hawking fails to prevent the formation of such rings.
A wormhole with no CTC
A roman ring with two wormholes
A roman ring with four wormholes
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