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A quintet of quandaries: five no-go theorems for Relational Quantum Mechanics

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arxiv 2107.00670 v2 pith:QSQ7EMIG submitted 2021-07-01 quant-ph

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keywords quantumphysicalsystemeventfivemechanicsno-goontology
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Relational quantum mechanics (RQM) proposes an ontology of relations between physical systems, where any system can serve as an `observer' and any physical interaction between systems counts as a `measurement'. Quantities take unique values spontaneously in these interactions, and the occurrence of such `quantum events' is strictly relative to the observing system, making them `relative facts'. The quantum state represents the objective information that one system has about another by virtue of correlations between their physical variables. The ontology of RQM thereby strives to uphold the universality and completeness of quantum theory, while at the same time maintaining that the actualization of each unique quantum event is a fundamental physical event. Can RQM sustain this precarious balancing act? Here we present five no-go theorems that imply it cannot; something has to give way.

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Cited by 2 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score.

  1. Agency under indefinite causality: operational eternalism in higher-order quantum theory

    quant-ph 2025-12 conditional novelty 5.0 of 10

    In indefinite-causal-order quantum theory, an observer is a perspective-dependent grouping of input/output data, with a new 'friendliness' criterion for causally compatible agents.

  2. Is Quantum Mechanics Universal? EWF Experiments and Non Absoluteness of Events

    quant-ph 2026-05 unverdicted novelty 3.0 of 10

    Convivial Solipsism is presented as a coherent interpretive framework that resolves the non-absoluteness of events in quantum mechanics while maintaining universality and intersubjectivity.

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