On Sat, Nov 17, 2012 at 11:01:49PM -0800, Craig Weinberg wrote:
> In a recent paper entitled
> > “Nothing happens in the Universe of the Everett Interpretation”:
> > http://arxiv.org/abs/1210.8447
> > Jan-Markus Schwindt has presented an impressive argument against the 
> > many-world interpretation of quantum mechanics.
> >
> > The argument he presents is not new, but, in my opinion, nobody ever 
> > presented this argument so clearly. 
> >
> > In a nutshell, the argument is this:
> > To define separate worlds of MWI, one needs a preferred basis, which is an 
> > old well-known problem of MWI. In modern literature, one often finds the 
> > claim that the basis problem is solved by decoherence. What J-M Schwindt 
> > points out is that decoherence is not enough. Namely, decoherence solves 
> > the basis problem only if it is already known how to split the system into 
> > subsystems (typically, the measured system and the environment). But if the 
> > state in the Hilbert space is all what exists, then such a split is not 
> > unique. Therefore, MWI claiming that state in the Hilbert space is all what 
> > exists cannot resolve the basis problem, and thus cannot define separate 
> > worlds. Period! One needs some additional structure not present in the 
> > states of the Hilbert space themselves. 
> >
> > As reasonable possibilities for the additional structure, he mentions 
> > observers of the Copenhagen interpretation, particles of the Bohmian 
> > interpretation, and the possibility that quantum mechanics is not 
> > fundamental at all.
> >
> source <http://www.physicsforums.com/blog.php?b=4289>

Rather than Copenhagen observers, the many minds of Everett fits the

See http://en.wikipedia.org/wiki/Many-minds_interpretation

As I see it - the argument is not new, and has been adequately
addressed within the Everett framework. What surprises me are people
like Deutsch sticking to their preferred bases...


Prof Russell Standish                  Phone 0425 253119 (mobile)
Principal, High Performance Coders
Visiting Professor of Mathematics      hpco...@hpcoders.com.au
University of New South Wales          http://www.hpcoders.com.au

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