| | I replied to Cal, "And you're merely displaying your ignorance of what I said. I was replying to Joel Catala, who wrote: In the Schroedinger's cat experiment, if the disintegrating bit of radioactive substance is of the size of the buckminsterfullerene molecule (or smaller), the laws and axioms of quantum mechanics indeed apply with full validity, and Schroedinger's description is deemed as fundamentally correct. So, where did you get the idea that I was attributing that view to contemporary physicists? Cal replied, Do you doubt that superposition states can exist for the the buckminsterfullerene molecule? See for example here. Note that Joel wrote that the laws of QM (in this case the superposition of states) apply for systems "the size of the buckminsterfullerene molecule or smaller". As far as I know cats and glass vessels are not smaller than a buckminsterfullerene molecule, so your sarcastic remarks about cats that are dead and alive at the same time are misplaced; in an earlier post I've explained the historical context of Schrödingers thought experiment. I'm sorry. I stand corrected. It appears that I misread Joel's post, and took him to be claiming that Schroedinger's thought experiment was itself legitimate, when all he was claiming is that its bmf analog was. There was clearly no justification for my misreading him, as he was quite clear in what he said. However, I still don't understand how an electron can be both a particle and a wave at the same time, any more than Schroedinger's cat can be both alive and dead at the same time. Your reply, "That's just an experimental fact, which you claim not to dispute," is incorrect. It's not an experimental fact; it's an interpretation of an experimental observation - an interpretation that doesn't make sense, because a particle and a wave are two different entities; an electron cannot be both at the same time.
First of all, there is no official "Objectivist claim" that QM tells us that particles follow and don't follow at the same time a trajectory, or that a particle can be at two places at the same time. I said nothing about an "official Objectivist claim", I said "the Objectivists' claim", while this is what I repeatedly hear Objectivists say. But if I recall correctly, there is even in the Objectivist canon (Rand's and/or Peikoff's writings) a remark that physicists believe that a particle can be at two places at the same time, although I can't remember at the moment where that is stated. I haven't seen that. You may be thinking of Peikoff's statement in OPAR, in which he writes that "Many commentators on Heisenberg's Uncertainty Principle claim that, because we cannot at the same time specify fully the position and momentum of subatomic particles, their action is not entirely predictable, and that the law of causality therefore breaks down. This is a non-sequitur, a switch from epistemology to metaphysics, or from knowledge to reality." (pp. 16, 17)
I wrote, "Secondly, I myself did not make that claim; I simply asked you a question, because I wasn't clear on what you were claiming. Please don't read more into what I say than is actually there. And where did I say that you made that claim? Okay, I see that you didn't; I must apologize for implying as much. But even if you didn't state that explicitly, the whole tenor of your argument suggests that you think that physicists do claim such things. Whoa! First, you object to my suggestion that you made that claim, and in the very next breath you so much as make it. I retract my apology! In fact, I don't think that physicists claim this, because I have no basis on which to think it. I have heard some physicists say things that I regard as nonsensical, but, fortunately, I haven't heard them say that.
- Bill
(Edited by William Dwyer on 4/19, 1:16am)
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