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waveman comments on Avoiding Your Belief's Real Weak Points - Less Wrong

50 Post author: Eliezer_Yudkowsky 05 October 2007 01:59AM

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Comment author: waveman 22 March 2011 10:12:35AM 0 points [-]

multiple universes... I'm sure there exists some kind of physical explanation

It is well explained in "Quantum Mechanics and Experience" by David Z. Albert.

Essential the many worlds theory works like this (on one interpretation):

There is really one universe. It is the deterministic world of the wave function. Our apparent universe is actually just a projection of that deterministic wave function. There is no collapse of the wave function, it just seems like there is, due to decoherence.

If you imaging a movie screen showing two different stories at once, there is just one movie, but each of the characters in each story behave as if they are aware of their story. In our world, decoherence is what creates the multiple stories.

At least one survey of physicists found MW was the most popular interpretation of QM; at worst it is mainstream.