On 3/2/2015 6:18 PM, John Clark wrote:
On Mon, Mar 2, 2015 at 3:46 PM, LizR <lizj...@gmail.com
<mailto:lizj...@gmail.com>> wrote:
>Do superpositions still occur in the MWI? I thought they were supposed to
be
branches (which are perhaps able to recombine) ?
In the MWI a branching can only occur if there is a difference between 2 universes, for
example if a photon went through slot A in one and slot B in another, but after it goes
through the slits if the photons then hits a photographic plate (or a brick wall) then
the photon no longer exists in either universe so they become identical again, so the
universes recombine; but the history that the photon went threw slot A only and slot B
only remain and this overlapping of realities causes the interference pattern on the
film. But if there were no photographic plate or brick wall the photons would just
continue into infinite space and the universes would remain different and separate forever.
The great thing about all this is that unlike Copenhagen the MWI does't need to explain
what a observer or a observation is.
The tricky part comes when there's a detection of which slit the photon went thru...so the
universes are separate and there's no interference pattern...but then the detection is
erased and the universes merge again.
Brent
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