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Originally posted by CSflim
Yes and no...no matter neeeds to go faster than the speed of light, and also no information could be sent by this "communication", so as such is doesn't result in infinite energy, or problems with causality (sending instructions back in time).
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*nod*, causality isn't broken.
But, what happens to someone "elsewhere" is predictable, based off an observation made at a point in space time. It is a non-local effect.
In the many worlds interpritation, the 'observation' simply makes your reality orthoginal to some other realities. It is a local operation. The realities where the photon isn't found to have a consistent orientation are just never encountered by your worldline.
In the classic model, your observation at one point has non-local effects on reality, popogating at an arbitrary speed. A third party could see either person A observing the photon then person B observing the photon at right angles, or B then A: which one CAUSED the orientation of the photon at the other location is not determinable. That photon communicated faster than light/backwards in time/instantaniously depending on where you are when you are looking at the two events.
[quote]I don’t see how a photon’s interaction with itself constitutes the existence of another reality.[/quote
It doesn't imply it: it is consistent with it. Hell, when we figure out the chance that a photon is at a location, we integrate its chance of getting there over every possible path. One interpritation is that it went over every possible path, another is that a photon is a wave that magically turns into a particle when a mystical observer looks at it.
I know what I find more elegant.
Tell me what an observer is. When do quantum mechanical states collapse?
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As for faster then light communication, it does happen, and has been documented. I believe Einstein called it "spooky action" at a distance. Happens between entangled particles.
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No, something that could be interprited as faster than light communication (highly restricted: the communication is symetric and cannot be used to move information) has been observed.
Don't get me wrong: all the many worlds interpritation is is an interpritation. All the other models are is an interpritation. They predict the same behaviour, use the same equations. They just think the equations mean different things.