On 6/16/2018 3:40 PM, John Clark wrote:
On Sat, Jun 16, 2018 at 4:41 PM, Brent Meeker <meeke...@verizon.net
<mailto:meeke...@verizon.net>>wrote:
/
>
That's where MWI gets fuzzy. Do all the submicroscopic events
that make to macroscopic difference create different worlds? /
Yes, or at least that's what Everett said.
>
/That can't be right because "worlds" are classical things./
At human sizes and masses and speeds to a very good approximation
things are classical, that's why classical physics is still taught in
schools. When we talk about a world we're not really talking about a
single thing but a collection of worlds that are subjectively
indistinguishable or almost indistinguishable, that's why the Born
Rule can only give probabilistic answers. As to why the probability is
the Born rule, that is to say proportional to the square of the
magnitude of the particle's wave-function and not the cube or
something else, its because Gleason's Theorem says that the only one
that is unitary, the only one where all the probabilities add up to
exactly 1.
Sure. But that's mixing two different viewpoints. The probabilites are
observed in the classical-world. If the classical world is really a
bundle of microscopically quantum worlds, and that seems right, then you
can't infer that the probabilities in the classical world follow from
unitarity because unitarity is only a theorem for the evolution of the
microscopically quantum worlds.
Brent
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