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- Path: sparky!uunet!mtnmath!paul
- From: paul@mtnmath.UUCP (Paul Budnik)
- Newsgroups: sci.physics
- Subject: Re: QM non-causal?
- Message-ID: <446@mtnmath.UUCP>
- Date: 22 Dec 92 17:23:06 GMT
- References: <1992Dec21.134142.3455@oracorp.com>
- Organization: Mountain Math Software, P. O. Box 2124, Saratoga. CA 95070
- Lines: 60
-
- In article <1992Dec21.134142.3455@oracorp.com>, daryl@oracorp.com (Daryl McCullough) writes:
- > [...]
- > I'm not sure what you mean by "an objective measure". The statistics
- > is definitely *not* objective, in that different observers might use
- > different weights on the possibilities.
-
- I mean it is based on objective evidence. It is not different from QM in
- this respect. The difference is in what the statistics refer to. In classical
- mechanics they measure our ignorance and knowledge about a single objective
- physical state.
-
- > [...]
- > Why does it preclude it? Why isn't it possible to assume that we are
- > in some definite world, and the wave function measures our lack of
- > knowledge of which world we are in? Of course, the wave function does
- > not represent our lack of knowledge in the form of a probability, but
- > in the form of a probability amplitude.
-
- I happen to think that this is the case. However this assumption is in
- direct conflict with the assumption that QM is a complete theory. I think
- there is an objective physical state of a different nature than anything
- in either or classical or quantum mechanics and that the wave function
- provides a limited measure of our knowledge of that state.
-
- >[...]
- > I don't know why you think the physical existence of many different
- > worlds is any more necessary in the quantum case than in the classical
- > case of statistical mechanics.
-
- I only think it is if you assume the probabilities of QM are irreducible,
- i. e. not the measure of our state of ignorance of a more complete
- objective reality, but as a *complete* description of objective reality
- within the domain that QM applys to. If you are in disagreement with
- this dogma of QM there is no difference between classical statistical
- mechanics and quantum mechanics in this respect. If you do not disagree
- with this then I think you do have a problem. You do not need many worlds
- to resolve it but you need something and I have no idea what that
- something could be.
-
- > [...]
- > I disagree that Everett was doing "pointless mathematics". What the
- > mathematics shows is the coherence of quantum theory. [...]
-
- I may be forced to read Everett yet. I did not mean to imply that he was only
- doing pointless mathematics. I suspect that he did not address the problem
- of relating theory to experimental observations but only obscured
- *this problem* with pointless mathematics. You may be correct that aspects of
- his work are valuable contributions. You apparently agree that he has
- not adequately addressed the interpretation problem in QM:
-
- > I don't agree that Everett's work has closed the book on
- > interpretations of quantum mechanics by any means, but I
- > believe that it is an important contribution.
- > [...]
- > I'll have to postpone a rebuttal to [Bell's criticism of Everett]
- > until I reread his essay.
-
- I look forward to your comments on this.
-
- Paul Budnik
-