Jason Resch wrote:
Maybe that's enough though, to implement a brain and observer, that they
stop interfering in at least one basis (assuming they're not
contradictory, might all bases exist?)
Given an arbitrary density matrix, there is always a basis in which the
off-diagonal terms vanish (the state is an eigenstate of the
corresponding operator), and this means that there is no longer any
interference. The problem is that the operator for which this is true
may not be physically realizable in this (or any) world.
Bruce
Jason
On Monday, March 2, 2015, Bruce Kellett <bhkell...@optusnet.com.au
<mailto:bhkell...@optusnet.com.au>> wrote:
> LizR wrote:
>>
>> Do superpositions still occur in the MWI? I thought they were
supposed to be branches (which are perhaps able to recombine) ?
>
> Yes, we see superpositions everywhere -- as Brent says, they are a
consequence of the mathematics of Hilbert space. A pure state in one
basis is a superposition in any other basis. The idea of branches that
cease to interfere in MWI is one of the major conceptual problems of
that interpretation -- in what basis do the branches occur? Why those
branches (that basis) and no other. I do not think that current notions
of einselection actually ever get to the heart of the problem -- but
that is another discussion.
>
> Bruce
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