On 08-04-2022 07:28, Bruce Kellett wrote:

On Fri, Apr 8, 2022 at 1:42 PM smitra <smi...@zonnet.nl> wrote:On 08-04-2022 00:45, Bruce Kellett wrote:It has nothing to do with realism. Local physics is completelydefinedby what happens at the individual spacetime points. But that doesnotimply that variables have definite values before they aremeasured. Weallow for stochastic dependence on the physics at local spacetime points and also allow for MWI -- the operation of thedeterministicSchrodinger equation giving every possible outcome on every interaction. If you are not careful, you are going to make MWI realistic. The Humean assumption underlies any local theory,includingMWI if that can be shown to be local. It is not intrinsicallyrealist.Locality implies separability. If you disagree, show me the mathematics of a local state (referring to distinct spacetimepoints)that is not separable -- without begging the question, that is!Locality refers to the dynamics of a theory, not to properties of some particular state.The properties of the state refer to the dynamics of the underlying interactions. In quantum mechanics, the state vector tells you everything that can be known about the consequences of the underlying dynamics.

A Hamiltonian must be specified.

In classical physics, you don't have non-separable states, but you can get to non-local correlations using only local dynamics.Only in the trivial, everyday, sense of Bertlmann's socks.In QM you can get to non-separable states using only local dynamics.The non-separable state may be created at a single spacetime point, but that is not a relevant consideration if the parts then move apart.The mere fact that you can have non-classical entangled states does not imply that the dynamics of the theory is non-localThe fact of non-separable entangled states, which are unique to quantum mechanics, does imply non-locality. Vide above.... You still have not shown me this magical local state that is non-separable.

What matters is that the Hamiltonian is local.

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