On 11/13/2017 5:01 PM, agrayson2...@gmail.com wrote:


On Monday, November 13, 2017 at 4:41:02 PM UTC-7, John Clark wrote:

    On Mon, Nov 13, 2017 at 4:40 PM, <agrays...@gmail.com
    <javascript:>>wrote:

        *
        ​> ​
        If you find collapse of the wf anathema, instead of the MWI
        why not just assume the branches that aren't measured in this
        world, dissipate into the environment as I think Decoherence
        theory postulates?  MWI doesn't tell us what will be measured
        in this or any other particular world, so what's the downside
        to this hugely simpler way of avoiding collapse?*


    ​How is everything except one value dissipating any different from
    everything collapsing into one value?



How is everything except one value in this world (the others dissipating into the environment), WORSE than conjuring a multitude of universes for the other values to be measured? I fail to see anything "conservative" about this pov. When you pull a slot machine, is it really conservative to assert 10 million other universes come into being (along with the player!) for the other unrealized outcomes in this universe?

    And what does nature consider to be a measurement and what does it
    not? A change is simpler than a measurement and a theory without
    an assumption is simpler than a theory that needs an assumption. I
    say we don't really need an assumption of collapse (or
    dissipation) so get rid of it.


By replacing Decoherence with MWI seems to raise hugely more insoluble problems than simply using the Decoherence model of dissipation of the unrealized outcomes.

Decoherence implies small cross terms in the density matrix (which implies small measure in the given basis) but it doesn't say anything about "dissipating" the diagonal terms that represent possible outcomes.

Brent

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