Related variables describe world. Perhaps, some variables {hidden variable}| are not measurable.
process
Inputs go to both hidden and observable variables. Hidden and observable variables make outputs, each with conditional probability. Bayesian statistics can estimate optimal variable probabilities {maximal a posteriori estimate} {MAP estimate}. Experiments show that hidden variables do not exist.
non-locality
By GHZ, hidden variables cannot be local. Local hidden variables cannot predict quantum-mechanical events correctly (Bell's theorem). If some variables are hidden, quantum physics must be non-local. Classical physics is local, so classical physics has no hidden variables.
If quantum object actions do not correlate before they interact, Bell's theorem requires that quantum physics must be non-local.
local
If quantum object actions correlate before they interact, they can correlate in past or future, and quantum mechanics can be local. Past correlation means they had common cause, but then all tiny events must have common cause, making complex metaphysics. Future correlation means future interaction itself supplies correlation. Both these cases are unlikely. Therefore, quantum object actions do not correlate before they interact, and quantum physics is non-local. Experiments (Alain Aspect) [1981] on photon spin show non-local quantum-mechanical statistical distribution. Therefore, local realist theories are incorrect.
Physical Sciences>Physics>Quantum Mechanics>Theory>Hidden
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Date Modified: 2022.0224