On Sun, 10 Dec 2000 03:58:49 -0800 "jan carowan" <jancarowan at hotmail.com>
writes:
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> See you do not even know what Bell's theorem is. If you did, it
> would be
> obvious to you that Einstein's and Bohm's positions confront great
> difficulties.
Well, Bohm at least would have disagreed. He saw his causal interpretation of quantum mechanics as implying the essential wholeness of quantum phenomena. For Bohm apparent nonlocality is generated by what he called the quantum potential, which according to his theory exerts an influence that is dependent on its overall form rather than on its strength. Now for a long time the fact that Bohm's theory like conventional QM implies nonlocality was taken as indicating the existence of a contradiction within Bohm's theory. On the one hand Bohm was proposing a causal interpretation of QM but nonlocality seemed inconsistent with this. This dilemma for instance led his onetime coolaborator Jean-Paul Vigier to abandon research on the causal interpretation of QM and to turn his attention to cosmology. Bohm, himself dropped his work on the development of a hidden variable's alternative to convention QM for many years also. However, in the 1970s when Christopher Philippidis who had been a graduate student of Bohm, pursued reaearch aimed at calculating the shape of the quantum potential. He then applied these calculations to a consideration of the Ehrenberg- Siday-Aharonov-Bohm (ESAB) effect. Whereas, the conventional interpretation of QM took this effect as indicating the existence of nonlocality, within Bohm's causal interpretation of QM, this effect is explicalble in terms of the quantum potential which while modified by the presence of an electrical field is not diminished by distance.
>Einstein presumed that sense experience can be
> understood in
> terms of an idea of some external reality whose spatially separated
> parts
> are independent realities, in the sense that they depend on each
> other only
> via connections that respect space time separation in the usual way:
Bohm came to the conclusion that Einstein's assumptions on this did indeed have to be modified. A return to classical physics was forever forclosed but that Einstein's quest for a casual interpretation of quantum mechanics was not thereby (contrary to Bohr & Heisenberg) ruled out.
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> instaneous connections are excluded. But the existence of such a
> reality
> lying behind the world of observed phenomena is precisely what
> Bell's
> theorem--not the Tao of physics--proves to be impossible.
Bell, himself BTW saw Bohm's hidden varaibles theory as being nonlocal just as he saw conventional QM. His own work on this subject owed much to Bohm
Jim F.
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> Warm regards, Jan
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