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Old 05-05-2003, 11:30 PM   #111
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Originally posted by yguy
My understanding is that position and momentum cannot be known simultaneously. That a particle lacks either attribute is not an established fact if what I've seen on this board is accurate.
Your understanding of quantum mechanics is lacking. It has been demonstrated that Einstein's locality principle (i.e. particles have definite attributes independed of whether they are measured or not) is faulty. This was empirically demonstrated by violation of Bell's Inequalities. I know I've posted this before, but it was months ago and the search feature isn't working for me here, so I'll post it again. From A Modern Approach to Quantum Mechanics by John Townsend:

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Until 1964 it was believed that one could always construct a hidden-variable theory that would give all the same results as quantum mechanics. In that year, however, John S. Bell pointed out that alternative theories based on Einstein's locality principle actually yield a testable inequality that differs from the predictions of quantum mechanics.
...
Bell's results have inspired a number of experiments. With the exception of one experiment that measured the spin orientation of protons in the singlet state, these experiments have all been carried out on the polarization state of pairs of photons rather than on spin 1/2 particles. A suitably correlated pair of photons is produced, for example, in the annihilation of positronium in its ground state, but these photons are, of course, quite energetic gamma rays, for which there are no really efficient polarization filters. Suitable optical photons are produced in the cascade decays of atoms such as Ca or Hg excited by laser pumping ... and the phtons are emitted essentially back to back, with the atom itself not carrying very much momentum. The correlations are between measurements of the linear polarization for each of the photons. The most precise experiments of this type have been carried out by Aspect et al. In one case the Bell inequality was violated by more than nine standard deviations. On the other hand, the agreement with the predictions of quantum mechanics is excellent.
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So where does all this leave us? Certainly with a sense of wonder about the way the physical world operates. It is hard to guess how Einstein would have responded to the results. As we have noted, he believed particles should have definite attributes, or properties, independent of whether or not these properties were actually measured. As A. Pais recounts: "We often discussed his notions of objective reality. I recall that during one walk Einstein suddently stopped, turned to me and asked whether I really believed that the moon exists only when I look at it." In the microscopic world, the answer appears to be yes.
Though the experiments conducted used polarization states of pairs of photons, the physics is isomorphic with that of momentum-position uncertainty. Experimental verification of Bell inequality violations in the spin regime also serve to verify the notion that there will be an intrinsic quantum uncertainty between any two non-commuting observables. It is important to remember that this uncertainty is fundamental, it is not due to the fact that we simply lack the technology to make more precise measurements.
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Old 05-06-2003, 12:29 AM   #112
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Originally posted by yguy
I fail to see why the omission is of any import, or how I've misrepresented anything. The veracity of the conclusion is irrelevant to what I said, since the jury is still out on it.
You wished to give the impression that scientists are ignoring evidence that doesn't support their theory. They are not, they're simply waiting for the evidence to be substantiated.
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Why should they be? Obviously most attempts to find a unified field theory will at some point be revealed as dead ends, in which case such a discovery would save many scientists a lot of wasted effort. Right?
What they're worried about is that they already HAVE a theory that seems to work very nicely, that they've put a helluva lot of work into. You can't expect them to be happy about giving it up, especially when it's worked so well.
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Oh, please. Are you gonna stand there flat-footed and tell me there isn't politics involved in who gets hired and who gets research money? Next you'll be telling me there is no political maneuvering in the Catholic Church.
Frankly, reality doesn't much care who gets science grants and who doesn't. Science isn't INVENTING reality, guy, it's just investigating it.
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How can a theory be "sexy"?
My guess is, it's a figure of speech.
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What does interaction between two photons have to do with the question of whether either possesses both position and velocity, without regard to whether either can be measured?
Suppose I assign an arbitrary quality, 'spleekness', to everything in existence. This quantity can't be measured by any rational means. Position and velocity may be similarly artificial concepts on the quantum scale.
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Or the evidence is too big to see.
Same result. The concept of an omnipotent deity is irrational simply because it's impossible to support or deny.. That's the whole point I'm trying to get across - science does not use the concept of god because the concept is intrinsically useless.
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Old 05-06-2003, 02:58 AM   #113
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Default Reality or locality, take your pick?

Bell's experiments in the 60s, and Aspects experiment in the 80s have unambiguously ruled out Einstein's local hidden variable hypothesis. We have to make our choice between reality as defined as "the universe exists independently of any observer", or locality defined as no signal can travel faster than light?
I have read an interview with John Bell, and Alain Aspect in Paul Davies book, The Ghost in the Atom! Bell doesn’t select between these, but prefer reality there faster than light signaling propagates through the ether, because this will give us less problem than the other alternative! But I admit locality in space-time, and reject reality in the quantum world, and consider that quantum objects can be non-locally interconnected, just as they where one, they influence each other Instantly without exchanging signals, this phenomenon is known as quantum entanglement!

However, Bohm' s non-local hidden variable interpretation is not ruled out, but later Experiments than these has been made in order to pin down the electrons momentum and position in a box, but the electron begins to bounces like crazy more, and more as the space decreases. That confirms that Heisenberg 's principle of uncertainty is intrinsic in the quantum world, as linked to earlier here by me to Brian Greene the Super String Expert. This "quantum claustrophobia" by the electron rises problems for realistic theories, I mean that how do you reconciles that weirdness with realistic theories?
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Old 05-06-2003, 06:42 AM   #114
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Originally posted by yguy

How can a theory be "sexy"?
It attracts money.
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Old 05-06-2003, 10:02 AM   #115
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Originally posted by Corona688
You wished to give the impression that scientists are ignoring evidence that doesn't support their theory.
No, I wished to point out their unconscious bias, and that science it not immune to stultification by dogma.

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What they're worried about is that they already HAVE a theory that seems to work very nicely, that they've put a helluva lot of work into. You can't expect them to be happy about giving it up, especially when it's worked so well.
Why wouldn't they be happy to see where they went wrong? Is it the truth they're looking for, or justification for their efforts? If the first is inimical to the second, which will prevail?

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Frankly, reality doesn't much care who gets science grants and who doesn't.
You're deliberately missing the point. Reality doesn't care, but scientists sure as hell do.

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My guess is, it's a figure of speech.
That means nothing?

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Suppose I assign an arbitrary quality, 'spleekness', to everything in existence. This quantity can't be measured by any rational means. Position and velocity may be similarly artificial concepts on the quantum scale.
Pretty week parallel, considering that position and momentum are not arbitrary qualities.

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Same result. The concept of an omnipotent deity is irrational simply because it's impossible to support or deny.. That's the whole point I'm trying to get across - science does not use the concept of god because the concept is intrinsically useless.
Hey - guess it depends on what you're after, doesn't it? If the idea is to understand reality exclusive of supernatural considerations, you are obviously correct.
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Old 05-06-2003, 10:08 AM   #116
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Originally posted by Kimpatsu
Hey, lighten up. I'm the anal retentive one here. Take a Prozac if you have to, but let us rage at each other. It's entertaining.
Well doggone it, I guess I have to give you credit for being a good sport, at least.
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Old 05-06-2003, 04:49 PM   #117
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Originally posted by Kimpatsu
Hey, lighten up. I'm the anal retentive one here. Take a Prozac if you have to, but let us rage at each other. It's entertaining.
Entertaining is good, but we strive to keep the upper forms (and really, all of the board) civil and respectful.

It's expected that ideas will be attacked, but insulting an individual poster is never allowed. The warning was just that, and while you are free to be as anal retentive as you like, posters are expected to comply with the rules of the board.

If you simply want to berate each other for amusement, please feel free to do so privately.

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Old 05-06-2003, 05:54 PM   #118
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Originally posted by yguy
No, I wished to point out their unconscious bias, and that science it not immune to stultification by dogma.
*sigh* When have I ever claimed that the people involved in scientific study are perfect? Of COURSE they have a vested interest in their own research. I think you're missing something...

This new evidence that has the potential to cast doubt on the existing Standard Model, was recorded by - (drumroll please) - SCIENTISTS! You think science is an exclusive club for those that tout the party line? The requirements for research papers are simply that you back up your theories with robust data.
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Why wouldn't they be happy to see where they went wrong? Is it the truth they're looking for, or justification for their efforts? If the first is inimical to the second, which will prevail?
In case you haven't noticed, they are human beings. Think about it.
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You're deliberately missing the point. Reality doesn't care, but scientists sure as hell do.
You're also missing the point. There isn't by definition a standard party line that scientists have to adhere to. Guess what? Not all of them agree with the standard model on all points! It is so widely accepted simply because it is a very robust theory that does a better job of predicting reality than anything else we have right now. If you want to ditch the standard model, you'll have to do research and find something better. And guess what? That's apparently what some of them are doing. Research. Duh.
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That means nothing?
I remind you that you're looking at a news item, not a scientific paper. Calling something a 'sexy theory' is simply a bit of grandstanding and dumbing-down for the cameras.
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Pretty week parallel, considering that position and momentum are not arbitrary qualities.
You're thinking that classical newtonian mechanics hold down to the quantum level; but I think newtownian mechanics is an emergent property, not an implicit one. I'm not certain on this point, however; there are others on this forum far better equipped to deal with this question than I.
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Hey - guess it depends on what you're after, doesn't it? If the idea is to understand reality exclusive of supernatural considerations, you are obviously correct.
Aaaaaaaaargh! You're not listening. Maybye an example will show my train of thought in simpler light...

Suppose I assert that a god is the direct cause of all random quantum effects. Fine.

But by defining god as the cause for reality then pointing to reality as a proof I are using an invalid argument... The form itself is valid 'if P then Q', but you're affirming Q instead of P; it's like saying 'if it's raining, there are clouds. There are clouds. Therefore, it's raining." That not an argument, that's just guessing. As you admitted earlier, a 'goddidit' explanation means the same thing as 'I don't know'. I'd much rather say 'I don't know'.

Additionally, god, being an agent rather than a process, cannot be used as a predictor of anything.. goals and plans that are utterly opaque to us mean that he can act without any visible rhyme or reason if he so chooses. he's not even part of the rules, he's OUTSIDE of them, and could change them on a whim whenever he wants. Sure, he seemingly hasn't. But it's assumed he COULD. How can you even try and build a theory around something that doesn't have to obey any rules at all?

Quite simply, you can't. Reason and an omnipotent god are not compatible concepts, and will never be no matter how hard you try and shoehorn him in.
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Old 05-06-2003, 06:00 PM   #119
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Originally posted by Wyz_sub10
If you simply want to berate each other for amusement, please feel free to do so privately.
But every good comedian needs an audience!
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Old 05-07-2003, 11:43 AM   #120
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Originally posted by Kimpatsu
But every good comedian needs an audience!
Maybe the third word of your sentence indicates the problem.

In the meantime...

Freethought Humor, Jokes, Etc.
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