Gisin's Argument and the Limits of Causal Explanations in Relativistic Spacetime

• URL: http://arxiv.org/abs/2608.18010v1
• Date: Tue, 18 Aug 2026 16:57:33 GMT
• Title: Gisin's Argument and the Limits of Causal Explanations in Relativistic Spacetime
• Abstract summary: We argue that proposed generalizations of the argument beyond determinism are unconvincing.<n>We introduce the framework of frame-indexed causal models in order to extend Gisin's argument to the genuinely probabilistic case.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Gisin has provided an argument for the conclusion that no covariant nonlocal model can reproduce the operational statistics observed in Bell experiments. Gisin's argument applies only to deterministic models and we argue that proposed generalizations of the argument beyond determinism based solely on statistical notions are unconvincing, as they lack the resources to formulate a satisfactory notion of no-retrocausality. We introduce the framework of frame-indexed causal models in order to extend Gisin's argument to the genuinely probabilistic case. Frame-indexed causal models associate potentially different causal models with different reference frames while requiring corresponding operational variables to agree runwise. Within this framework, we establish two no-go results based on Gisin's argument. First, we show that no empirically adequate frame-indexed causal model can jointly satisfy Independent Settings, No-Retrocausality, and Causal Lorentz Invariance. Second, it is established that this result continues to hold when Causal Lorentz Invariance is weakened to Lorentz Invariance of Causal Connections, which requires only the skeleton of the causal structure to remain invariant, thereby allowing the direction of causal influence to depend on the choice of reference frame. These results are discussed in the context of relativistic interpretations of quantum theory and nonclassical causal inference.

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