On 12/31/2013 3:24 PM, LizR wrote:
On 1 January 2014 12:05, meekerdb <meeke...@verizon.net <mailto:meeke...@verizon.net>> wrote:

    Mark A. Rubin <http://arxiv.org/find/quant-ph/1/au:+Rubin_M/0/1/0/all/0/1>
    (Submitted on 14 Mar 2001 (v1 <http://arxiv.org/abs/quant-ph/0103079v1>), 
last
    revised 10 May 2001 (this version, v2))

        Bell's theorem depends crucially on counterfactual reasoning, and is 
mistakenly
        interpreted as ruling out a local explanation for the correlations 
which can be
        observed between the results of measurements performed on 
spatially-separated
        quantum systems. But in fact the Everett interpretation of quantum 
mechanics, in
        the Heisenberg picture, provides an alternative local explanation for 
such
        correlations. Measurement-type interactions lead, not to many worlds 
but,
        rather, to many local copies of experimental systems and the observers 
who
        measure their properties. Transformations of the Heisenberg-picture 
operators
        corresponding to the properties of these systems and observers, induced 
by
        measurement interactions, "label" each copy and provide the mechanism 
which,
        e.g., ensures that each copy of one of the observers in an EPRB or GHZM
        experiment will only interact with the "correct" copy of the other 
observer(s).
        The conceptual problem of nonlocality is thus replaced with a 
conceptual problem
        of proliferating labels, as correlated systems and observers undergo
        measurement-type interactions with newly-encountered objects and 
instruments; it
        is suggested that this problem may be resolved by considering quantum 
field
theory rather than the quantum mechanics of particles.
    Comments:   18 pages, no figures. Minor changes
    Subjects:   Quantum Physics (quant-ph)
    Journal reference:  Found. Phys. Lett. 14 (2001) 301-322
    Report number:      WW-10184
    Cite as:    arXiv:quant-ph/0103079 <http://arxiv.org/abs/quant-ph/0103079>


    just moves the problem from FTL signaling to FTL labeling.


Where is the FTL? I don't recall any suggestion that the "contagion" of entangled systems spreading themeselves in the MWI involves anything FTL.

Of course in Hilbert space there's no FTL because the system is just one point and when a measurement is performed it projects the system ray onto a mixture of subspaces; spacetime coordinates are just some labels.

In fact, it's generally assumed to be very, very STL (unless light itself is involved). At great distances from the laboratory, one imagines that the superposition caused by whatever we might do to cats in boxes would decay to the level of noise, and fail to spread any further.

That's an interesting viewpoint - but it's taking spacetime instead of Hilbert space to be the arena. If we take the cat, either alive or dead, and shoot it off into space then, as a signal, it won't fall off as 1/r^2.

Brent

So a gaxlaxy (say) might be in a MWI bubble of superpositions that fails to split neighbouring galaxies for billions of years, because the difference between them is undetectable. Or maybe even planets.... What difference would it make to anyone in M31 if the Nazis had won WW2? (after the light travel time had elapsed, I mean. Maybe a few different radio signals could be picked up, if anyone pointed an antenna in the right direction...)

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