On Monday, October 14, 2019 at 8:38:59 AM UTC-5, John Clark wrote: > > On Mon, Oct 14, 2019 at 9:27 AM Philip Thrift <[email protected] > <javascript:>> wrote: > > *> Abstract. Bell’s theorem requires the assumption that hidden variables >> are independent of future measurement settings.* > > > Yes, Bell assumes hidden variables are local, not non-local as > backward causality would be. > > John K Clark >
https://arxiv.org/abs/quant-ph/9602020 : Construed as an argument against hidden variable theories, Bell's Theorem assumes that hidden variables would be independent of future measurement settings. This Independence Assumption (IA) is rarely questioned. *Bell considered relaxing it to avoid non-locality,* but thought that the resulting view left no room for free will. However, Bell seems to have failed to distinguish two different strategies for giving up IA. One strategy takes for granted the Principle of the Common Cause, which requires that a correlation between hidden variables and measurement settings be explained by a joint correlation with some unknown factor in their common past. The other strategy rejects the Principle of the Common Cause, and argues that the required correlation might be due to the known interaction between the object system and the measuring device in their common future. Bell and most others who have discussed these issues have focussed on the former strategy, but because the two approaches have not been properly distinguished, it has not been well appreciated that there is a quite different way to relax IA. This paper distinguishes the two strategies, and argues that the latter is considerably more appealing than the former. @philipthrift -- 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 [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/everything-list/04ca1531-edf5-46cb-b0d7-2621a19da581%40googlegroups.com.
