On 1/4/2012 12:34 PM, Stephen P. King wrote:
On 1/4/2012 3:03 PM, meekerdb wrote:
In the MW interpretation there is no collapse, but there is a split into (almost)
orthogonal "worlds" or each person splits into orthogonal "minds". These are just
projections onto different quasi-classical subspaces corresponding to different
measurement values. The projection is a mathematical, not a physical, operation.
Could you elaborate on the meaning of the word "almost" as it is used here? How do
we go from the implicit "always" of orthogonal relations between state vectors of the
linear algebra of Hilbert spaces to an "almost" orthogonal relation? Is this a definable
In the usual density matrix formalism, the cross terms in the system being measured never
go exactly to zero and the world is never exactly classical. Decoherence provides a
physical description of the evolution to almost orthogonal, c.f. Schlosshauer's review paper.
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