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Old 11-09-2007, 10:04 PM
ChrisV ChrisV is offline
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Join Date: Jul 2004
Location: Adelaide, Australia
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Default Re: Do I Misunderstand The Double Slit Experiment

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You are making a terrible analogy. As I told madnak almost all unexplained events in this day and age don't strike scientists as totally mysterious. For instance if we discovered that two people could truly communicate telepathically it wouldn't be evidence for God. The double slit experiment however, if I understand it correctly, is more than just unexplained. It seems to defy logic, not just science. And it seems to invoke human consciousness.

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David,

The idea that this invokes human consciousness is as a result of the vagueness of the Copenhagen Interpretation, which fails to properly define "observer" or even "measurement. Steven Weinberg quoted on the Wikipedia page about the Copenhagen Interpretation:

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Bohr's version of quantum mechanics was deeply flawed, but not for the reason Einstein thought. The Copenhagen interpretation describes what happens when an observer makes a measurement, but the observer and the act of measurement are themselves treated classically. This is surely wrong: Physicists and their apparatus must be governed by the same quantum mechanical rules that govern everything else in the universe. But these rules are expressed in terms of a wave function (or, more precisely, a state vector) that evolves in a perfectly deterministic way. So where do the probabilistic rules of the Copenhagen interpretation come from?
Considerable progress has been made in recent years toward the resolution of the problem, which I cannot go into here. It is enough to say that neither Bohr nor Einstein had focused on the real problem with quantum mechanics. The Copenhagen rules clearly work, so they have to be accepted. But this leaves the task of explaining them by applying the deterministic equation for the evolution of the wave function, the Schrödinger equation, to observers and their apparatus.

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You should also look up the transactional interpretation, which removes the weirdness at the expense of allowing limited backwards-in-time causality (not the kind you can send messages with). Bottom line is that although the maths of quantum mechanics works, how we interpret what is happening is very much still up in the air. Schroedinger's Cat and that sort of thing is entirely a product of the Copenhagen Interpretation, which is untested (and currently untestable).
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