On 10/29/2014 9:50 AM, John Clark wrote:
On Tue, Oct 28, 2014 at 8:26 PM, meekerdb <meeke...@verizon.net
<mailto:meeke...@verizon.net>> wrote:
> If "recombine" just means exhibiting interference then I'd say it's just a
semantic quibble. When a photon goes thru both of Young's slits and
interferes with
itself I'd say that happens in one world.
The universe splits because there is a difference between them, the photon (or
electron) goes through the left slit in one universe and the right slit in another
universe. If after that the photons
There's only one photon.
hit a photographic plate (or just a brick wall) both photons are destroyed and there is
no longer any difference between the 2 universes so they recombine,
But there is a difference in the path lengths from the source to detector, which produces
the probability pattern for detection. This pattern is one world. If the path lengths
were different in different worlds there would be no interference of phases, which is just
what happens when you shoot classical particles thru the slits.
but if we examine history we will see evidence that the photon went through the left
slit only and evidence that it went through the right slit only and this causes
interference bands.
?? What kind of evidence do you refer to. Delayed quantum eraser experiments show that if
there is such evidence, if it's not erased, the interference disappears.
If we hadn't put a photographic plate (or a brick wall) in the photon's path and just
let them continue into infinite space the 2 universes would always be different and so
never recombine.
It depends on whether they interact with the environment. In the C70 buckyball
experiment, photons that were never detected still localized the buckyballs and destroyed
the interference pattern. On the other hand in the Dopfer experiment the idler photon was
focused on the detector so that lateral momentum information was erased and the
interference pattern was observed.
Brent
For statistical reasons we only see interference if the 2 universes are almost
identical; although it's logically possible that the universe where Lincoln was not
assassinated and our universe could both evolve into a state that was identical and so
recombine and cause interference it's astronomically unlikely. Actually astronomically
is far too weak a word but infinitely is too strong, this my be the very rare occurrence
where a new word might be useful.
John K Clark
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