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Re: [physicsnorthyork] Alain Aspect speaks on John Wheeler's Delayed Choice Experiment

From: Gary G.
Sent on: Wednesday, November 13, 2013 12:50 PM
The most commonly accepted model for radiative propagation involves waves travelling backwards in time (see Wheeler-Feynman).

Apart from saying you "know of no evidence" of backwards time travel, which is I think something of an argument (though not a very compelling one), you have merely repeated what you said in the first post: there you say other explanations (such as hidden variables) are "more plausible," here you say that backwards time travel explanations are "less likely" (presumably than your hidden variables suggestion). Sorry to be a stickler, but you really haven't answered the question (except for the "no evidence" part, which is false).

You seem to be appealing to something like intuition, or common sense. But these things can both be misleading, or just plain wrong, especially in the realm of theoretical physics, as I'm sure you know. Something a little more substantial is required, I think.

You and Bohm may be right about hidden variables, of course, but Bohm's model poses its own challenges: it violates ontological parsimony, for example, in a way that the time travel model doesn't. My point is that your criterion for preferring the former over the latter isn't very scientific: it seems to me like something of an unjustified bias.

Pls understand, this isn't a personal attack at all, just a criticism of your position.

Sent from my iPad

On Nov 13, 2013, at 12:25 PM, "David" <[address removed]> wrote:

Travelling back in time seems less likely than the photon having properties that we do not understand.

Historically, there have been countless situations where we did not understand what was going on regarding some phenomenon. 
I do not know of any evidence for anything going back in time.

Therefore, I think some unknown factor is a more plausible explanation than the photon going back in time. 
Dave :)

Sent from my iPod

On[masked], at 12:15, Gary Graham <[address removed]> wrote:

Very interested in knowing why you say "more plausible." I'm not being frivolous, I really want to know.

Sent from my iPad

On Nov 12, 2013, at 7:25 PM, "David" <[address removed]> wrote:

The delayed choice results suggests that the photon has hidden variables that make it appear as a particle when there is no beam splitter, and makes it appear as a wave when there is a beam splitter.
This seems more plausible than the idea that by adding the beam splitter the photon goes back in time and becomes a wave.
PS. Very, very interesting stuff. David Bohm has suggestions in his book 'Causality and Chance in the New Physics' which address this issue. Maybe we should all read his book and then discuss?
----- Original Message -----
From: Mohsen

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