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Roman ring
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==Chronology protection== [[Semiclassical gravity|Semiclassical]] approaches to incorporating quantum effects into general relativity seem to show that the [[chronology protection conjecture]] postulated by physicist [[Stephen Hawking]] fails to prevent the formation of such rings, although [[Matt Visser]] feels that there are reasons to think the semiclassical approach is unreliable here, and that a full theory of [[quantum gravity]] will likely uphold chronology protection.
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