On Thu, Aug 31, 2023 at 12:27 PM smitra <smi...@zonnet.nl> wrote: > There is no problem here because in practice MWI is nothing more than > the usual QM formalism to compute the outcome of experiments where you > then assume that the ensemble of all possible outcomes really exists. > Locality then follows from the fact hat the dynamics of the theory is > manifestly local. The Hamiltonian only includes local interactions and > observers are part of this dynamics. Although observer are not > explicitly treated as being part of the wavefunction that describes the > entire system, the assumption is that in principle, this is the case. In > practice, one can then proceed according to the usual QM formalism. >
That is all very well, but it is not a local account of violations of the Bell inequalities. You merely claim that the local theory is such an account, but you do not spell it out. We have had this discussion before, and you couldn't give the detailed local account then either. Bell'e theorem applies in Everettian quantum mechanics in exactly the same way as it applies in one-world accounts. Bell's theorem proves that the effect is non-local, so no local account is possible in any interpretation of QM. John points out the thought experiments by Deutsch makes it clear that > the usual QM formalism will not work in certain cases, that will then > falsify the ad hoc collapse postulate. If you then believe that MWI > cannot account for violation of Bell's inequalities while ordinary QM > can, then that begs the question of how removing the FAPP unobservable > sectors where all other outcomes are realized, could matter at all. > The other sectors are not just FAPP unoservable, they are not observable in principle. How could the presence of unobservable fairy tales affect anything at all? The standard account of violations of the Bell inequalities in quantum mechanics relies on the notion of non-locality. And since the effect is non-local, no local account is possible. 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/CAFxXSLTAg%3D%2BVf34FWWYXZ3%2BxKwkZmNWdt2VM_CRfHHBm3nqE%3Dg%40mail.gmail.com.
