No Events on Closed Causal Curves
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...
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| Veröffentlicht in: | Foundations of physics 2022-02, Vol.52 (1), Article 26 |
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| creator | Paganini, Claudio F. |
| description | 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. |
| doi_str_mv | 10.1007/s10701-022-00542-4 |
| format | Article |
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| subjects | Classical and Quantum Gravitation Classical Mechanics Compatibility Context Gravitation theory History and Philosophical Foundations of Physics Philosophy of Science Physics Physics and Astronomy Quantum Physics Quantum theory Relativity Theory Statistical Physics and Dynamical Systems |
| title | No Events on Closed Causal Curves |
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