On Fri, Mar 4, 2022 at 4:05 AM smitra <smi...@zonnet.nl> wrote: > On 03-03-2022 01:05, Bruce Kellett wrote: > > On Thu, Mar 3, 2022 at 10:50 AM John Clark <johnkcl...@gmail.com> > > wrote: > > > >> On Wed, Mar 2, 2022 at 5:50 PM Bruce Kellett <bhkellet...@gmail.com> > >> wrote: > >> > >>> _> Many worlds is not a local theory._ > >> > >> Many worlds can explain all known experimental results without > >> resorting to non-local influences because many worlds is not a > >> realistic theory. > > > > In that case, if you believe that MWI is local, give me the local > > account of Bell-type correlations of spin measurements at spacelike > > separations. I will salute you if you can do this, because no one else > > has ever managed in the past. Realism is completely beside the point. > > > > Bruce > > It's trivial, as the dynamics is described by a Hamiltonian that only > contains local interactions

All local Hamiltoinans contain only local interactions. The point here is that the correlations are not determined by a local Hamiltonian. Consider this: All local interactions are separable (have separable states). The entangled triplet state is not separable. Therefore it is not local. This mans that all non-local effects arise > via common cause effects. The creation of the entangled pair of spins > happens at some space-time point, so it's the result of local > interactions. The later when Alice and Bob each receive one of the two > spins, they get correlated with the spins they measure, because they and > their measurement gear consist of particles that evolve according to the > Schrodinger equation too and that evolution also only involves local > interactions. This then causes Bob and Alice to evolve in superpositions > that are correlated as a result of the initial entanglement of the spin. > But the effect of that initial entanglement is only non-locally available at the point of Alice's and Bob's separate measurements. So your account has not eliminated the non-locality -- you have just disguised it by calling it a "common cause" effect. That common cause is only non-locally available to Alice and Bob. Bruce -- You received this message because you are subscribed to the Google Groups "Everything List" group. To unsubscribe from this group and stop receiving emails from it, send an email to everything-list+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/everything-list/CAFxXSLQe9ot4EoHu-YcTdWgch9bdfVKzJLGzOn3%3DpnXtqeWQjw%40mail.gmail.com.