Paganini, Claudio F. (2022) No Events on Closed Causal Curves. FOUNDATIONS OF PHYSICS, 52 (1): 26. ISSN 0015-9018, 1572-9516
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We introduce the Causal Compatibility Conjecture for the Events, Trees, Histories (ETH) approach to Quantum Theory (QT) in the semi-classical setting. We then prove that under the assumptions of the conjecture, points on closed causal curves are physically indistinguishable in the context of the ETH approach to QT and thus the conjecture implies a compatibility of the causal structures even in presence of closed causal curves. As a consequence of this result there is no observation that could be made by an observer to tell any two points on a closed causal curve apart. We thus conclude that closed causal curves have no physical significance in the context of the ETH approach to QT. This is an indication that time travel will not be possible in a full quantum theory of gravity and thus forever remain a fantasy.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | QUANTUM-MECHANICS; INFORMATION; Closed causal curves; Events Trees Histories approach to Quantum Theory; Time travel; Semi-classical; Quantum Theory |
| Subjects: | 500 Science > 510 Mathematics |
| Divisions: | Mathematics > Prof. Dr. Felix Finster |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 05 Feb 2024 14:24 |
| Last Modified: | 05 Feb 2024 14:24 |
| URI: | https://pred.uni-regensburg.de/id/eprint/57366 |
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