Adjudicating Between Different Causal Accounts of Bell Inequality Violations

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Claims that classical causal models with inter-lab influences fit Bell-violation data better are tested by fitting models to a lab dataset with 25 measurement settings (each with four outcomes) and comparing predictive errors using a train-and-test model selection procedure; the parametrically radical “quantum causal” models show lower test error while unrestricted classical models overfit (higher test error), and a separate argument invoking the Leibnizian methodological principle shows parameter-restricted classical accounts must either hide empirically indistinguishable ontology or fail to reproduce Bell violations.

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1. 0:00Introduction
2. 1:43Analogy between two dichotomies
3. 3:01Achieving realism in quantum theory
4. 4:00Bell experiment
5. 10:20Conditional density operators
6. 14:15Empirical adequacy
7. 20:38Faithfulness
8. 22:19Restriction
9. 27:20Leibnizian methodological principle
10. 29:07Why should you believe it
11. 30:06Variant of the principle
12. 31:24The Bell Experiment
13. 32:31The leibnizian methodological principle
14. 36:44Summary
15. 46:42What else needs to be done