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| Format: | Preprint |
| Veröffentlicht: |
2025
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| Online-Zugang: | https://arxiv.org/abs/2512.22879 |
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| _version_ | 1866914222116438016 |
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| author | Grinbaum, Alexei |
| author_facet | Grinbaum, Alexei |
| contents | After two decades of research on indefinite causality, a philosophical lesson emerges: the tension between operational quantum theory and dynamical spacetime physics is unbridgeable if one believes both types of theories to be fundamental. We interpret this tension through operational eternalism, a stance analogous to the block-universe view but applied to information rather than geometry. Inputs and outputs are primary givens, while agents are secondary constructs arising from specific groupings of data. Agency is perspectival: from Alice's perspective Bob may not qualify as an observer, and vice versa. These results redefine the observer in the operational approach as a tool to avoid non-causality. They also provide a criterion for Wigner's friends as a class of causally compatible agents. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2512_22879 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Agency under indefinite causality: operational eternalism in higher-order quantum theory Grinbaum, Alexei Quantum Physics After two decades of research on indefinite causality, a philosophical lesson emerges: the tension between operational quantum theory and dynamical spacetime physics is unbridgeable if one believes both types of theories to be fundamental. We interpret this tension through operational eternalism, a stance analogous to the block-universe view but applied to information rather than geometry. Inputs and outputs are primary givens, while agents are secondary constructs arising from specific groupings of data. Agency is perspectival: from Alice's perspective Bob may not qualify as an observer, and vice versa. These results redefine the observer in the operational approach as a tool to avoid non-causality. They also provide a criterion for Wigner's friends as a class of causally compatible agents. |
| title | Agency under indefinite causality: operational eternalism in higher-order quantum theory |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2512.22879 |