Disconnect With Inequality Realism Assumption And Bells' Lambda

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SUMMARY

This discussion centers on Bell's theorem and its implications for hidden variable theories in quantum mechanics. It highlights that a hidden variable theory can be non-deterministic, allowing for random evolution of variables, which challenges classical assumptions of locality. The conversation references Bell's inequality and its violation, suggesting that local non-realism may provide explanations for quantum correlations. Additionally, it touches on interpretations of quantum mechanics, including Feynman's Sum Over Histories and Consistent Histories, emphasizing the complexity of local realism versus non-local realism.

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  • Understanding of Bell's theorem and its implications in quantum mechanics
  • Familiarity with quantum mechanics terminology, including local realism and non-local realism
  • Knowledge of hidden variable theories and their interpretations
  • Basic grasp of quantum correlations and Bell's inequality
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  • Research Bell's inequality and its significance in quantum mechanics
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Physicists, quantum mechanics researchers, and students interested in the philosophical implications of quantum theory and the interpretations of Bell's theorem.

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Bell, QM Ideas - Science 177 1972 :" Strictly, however. a hidden variable theory could be non-deterministic; the hidden variable could evolve randomly (possibly even discontinuously) so that their values at one instant do not specify their values at the next instant"
From the locality assumption, (EPR on non-locality: " No reasonable definition of reality could be expected to permit this")
With no assumption of determinism or of classical behavior with probabilities p(ab|xy) that satisfy the locality decomposition
S = (a0b0+(a0b1) +(a1b0) - (a1b1) ≤ 2
Bell on realism: "That there should be definite outcomes possible for counter factual settings"
But are there formulations for predetermined values equivalent to those for locality ?
So given Bells definition of lambda above it seems you could expect that S = 2√2 and the QM predicted correlations and inequality violation. And that they suggest local non realism explanation.
 
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morrobay said:
Strictly, however. a hidden variable theory could be non-deterministic; the hidden variable could evolve randomly (possibly even discontinuously) so that their values at one instant do not specify their values at the next instant"

Without answering your question at the end, that is indeed correct.

Both Feynman's Sum Over Histories and Consistent Histories are hidden variable theories of that type.

But its not what is usually thought of as hidden variable.

I don't believe anything in QM suggests local non realism, local realism (in fact Bells Theorem strongly suggests otherwise - but I don't want to get into it because the answer depends on what you mean by Local Realism eg MWI can be viewed as local realistic - but not counterfactual - which is why the issue is subtle), non local realism, or any of the myriad of interpretations floating around - that's why they are called interpretations.

But regarding your specific question if what Bell wrote suggests whatever - I will let others get into that - its not my thing.

Thanks
Bill
 
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