On 10/30/2011 5:13 PM, Nick Prince wrote:


On Oct 30, 8:56 pm, Russell Standish<li...@hpcoders.com.au>  wrote:

My point about the unitary evolution was that the clicking of the
Geiger counter is not a unitary process - and until you hear it, you remain in
superposition.


- Show quoted text -
I thought that in the everett interpretation everything was unitary?


best wishes
Nick


Right. In Everett's interpretation Nick's consciousness exists in many superpositions and there must be some additional mechanism of consciousness that accounts for the separation of these conscious streams of experience. This would be the same mechanism that collapses the wave function in the Copenhagen interpretation - something like decoherence except that when the cross terms become sufficiently small they become exactly zero. This would be a "small" non-unitary step. But it requires that there be distinguished variables in which the density matrix becomes diagonal - the "pointer basis".

Brent

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