- From: WillBBlake@a...

Date: Sun Feb 1, 2004 4:26 am

> I tentatively suggest that FoR (or MWI; I haven't read much of

If I understand you correctly, your difficulty is essentially the

> other people's accounts) may err in attempting to describe

> interference as a multiverse phenomenon. Perhaps the correct use of

> the multiverse is only for subsequent measurement and decoherence.

> By this I don't mean to suggest the need for an observer; just

> that, starting from some initial conditions in our universe, the

> wave function exists in our single universe and shows interference

> and other QM behaviour. Then, when decoherence occurs along with

> some measurement, branching into a set of new and non-interfering

> universes takes place. If this view is correct, the multiverse is a

> description of the separation of the different universes into the

> various possibilities following a measurement while the wave

> function in a single universe describes interference before the

> measurement.

problem of the preferred basis in Quantum Mechanics. That is, our

description of a universe is dependent on a measurement basis, but

the theory does not single out any basis as special. For a discussion

of this problem see

http://plato.stanford.edu/entries/qm-manyworlds/#6.2

Also, have you heard of the Many Minds Interpretation of Quantum

Mechanics, where the problem of the preferred basis (allegedly) does

not arise. See, for example,

http://www.ibiblio.org/weidai/Many_Minds.pdf

Cheers,

Brian - At 13:50 10/02/04 +0100, I wrote:
>...<snip> Some work has been done

Here is the precise reference of the book I did mentionned

>explaining why position is naturally favoured by "macroscopic" memory

>machine (see the book by Joos, Kiefer & Al.) on decoherence which contains

>references around this and similar question).

above. I would like to insist because that book shed

light on many points which have been discussed here.

I am interested in any comment on that book, which I

find quite interesting.

E. JOOS, H.D. ZEH, C. KIEFER, D.GIULINI, J. KUPSCH,

I.O. STAMATESCU Decoherence and the Appearance

of a classical World in Quantum Theory (second edition),

Springer, 2003. (first publ: 1996).

Bruno