On 6/16/2018 10:16 AM, John Clark wrote:
>
/Another universe comes into existence when Joe the Plumber
performs, say, a spin measurement./
But a measurement (whatever in the world that means) does not need to
be made and there is nothing special about Joe, if Everett is right
the same thing happens every time an electron in Joe's skin encounters
a photon, or for that matter whenever an electron anywhere encounters
anything.
That's where MWI gets fuzzy. Do all the submicroscopic events that make
to macroscopic difference create different worlds? That can't be right
because "worlds" are classical things. So the Heisenberg but problem
seems to reappear in different form.
Brent
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