Serafino,

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I think I get the gist of what you are saying but it is not quite the case. There is no energy flux directly associated with wave-functions (like with electomagnetic or mechanical waves) but is a probability density and a probability flux associated with the square of linear functionals of the wave-function. The physical quantities (observables) pertaining to any physical system described by the WF typically do not have fixed values assigned by the theory but only "expectation values", i.e. probabilities of being found in one among many of their possible eigenvalues. Quantum Mechanics tells you how to compute these expectation values but only specific experiments assign one among them to a specific system. If I understand what you are trying to say below there is indeed a way of, a posteriori, trying to build a more or less classical picture of a propagation of a beam or even a single particle (represented by a wave packet or something like it). That is what is called a local hidden variable model for QM and it works fairly well for a single isolated degree of freedom. But, as it turns out, none of these clever "cartoons" can be used to fully interpret the quantum description; this is not merely the result of a theorem but something which has been verified empirically numerous times by now. Come to think of it, even my correction to Lee is in need of correction because QM is not just about amplitudes! The phase relations between wave functions play a very central role in the non local phenomena (i.e. Berry and Aharonov-Bohm effects) so the myth of "just amplitudes" should be dispelled by now. Best regards, Godfrey Kurtz (New Brunswick, NJ) -----Original Message----- From: scerir <[EMAIL PROTECTED]> To: everything-list@eskimo.com Sent: Thu, 18 Aug 2005 22:55:51 +0200 Subject: Re: "Naive Realism" and QM Godfrey: > My point, if I can break it down a bit, > is that the amplitudes correspond, > not to "things" but to processes > and that what the amplitudes let you > compute are relative probabilities for > the occurrences of such processes. Maybe. Amplitudes of (whatever) waves satisfy linear equations. So, amplitudes combine linearly when several paths are - in principle - possible. On the contrary, the intensity of waves, that is to say the energy flux, is quadratic in the field amplitudes. So, intensities do not combine linearly. If we imagine there is a relation between the energy flux and the number of particles crossing a given (unit) area (this can be the quantum principle, or the quantum postulate) we also imagine there is a relation between the energy flux - quadratic in the field amplitudes - and the probability for those particles crossing that (unit) area. We can also imagine now there is only one particle flying .... Regards, serafino ________________________________________________________________________

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