On Sunday, October 6, 2019 at 12:43:05 PM UTC-5, Brent wrote:
>
>
>
> On 10/6/2019 1:25 AM, Bruno Marchal wrote:
> >> On 6 Oct 2019, at 02:50, Russell Standish <[email protected]
> <javascript:>> wrote:
> >>
> >> On Sat, Oct 05, 2019 at 09:05:49PM +1000, Bruce Kellett wrote:
> >>> On Sat, Oct 5, 2019 at 7:15 PM Bruno Marchal <[email protected]
> <javascript:>> wrote:
> >>>
> >>> On 5 Oct 2019, at 07:14, Bruce Kellett <[email protected]
> <javascript:>> wrote:
> >>>
> >>>
> >>> On Sat, Oct 5, 2019 at 1:10 AM Bruno Marchal <[email protected]
> <javascript:>> wrote:
> >>>
> >>> According to the above non-separable wave function, that means
> that Bob
> >>> gets only the ket |->,
> >>>
> >>>
> >>> That is vague. It means that Alice will access to the Bobs who get
> that
> >>> state, and never access to the Bobs who did not got it.
> >>>
> >>>
> >>> Exactly. And this is what you are required to explain. Just stating it
> as a
> >>> fact is not an explanation.
> >> ISTM that this follows from the Born rule - the probability of both
> >> Alice and Bob seeing the same spin is strictly zero.
> >>
> >> I understand that there are problems in deriving the Born rule from
> >> the MWI, and that derivations that purport to do so (such as mine) are
> >> contentious (to put it politely :)). So it doesn't exactly solve the
> >> problem, but maybe directs us toward where the solution lies.
> >>
> >> What I do get is Bruno's point that a single world assumption turns a
> >> nonlocal state into FTL "influence", the mechanism of which is quite
> >> unimaginable as you point out. An argument by incredulity, as it were,
> >> for the MWI.
>
> ISTM the same FTL "influence" is needed to split the world into two. I
> originally thought of the EPR as a split into two worlds starting from
> Alice's measurement and another split into two worlds starting from
> Bob's measurement and where these four worlds overlap in the future they
> interact so as to produce the Bell inequalities in the future overlap.
> But then I realized that whatever it is about the four worlds that
> causes them to interact in this way must have originated at the
> measurement events, otherwise future interactions will not be local
> anyway.
>
> Brent
>
> >
>
The multiple people describing the operation of worlds in the MWI is like
*Rashomon*.
https://en.wikipedia.org/wiki/Rashomon
@philipthrift
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