WhipTheHip -> RE: The Hubble Deep Field: The Most Important Image Ever Taken (9/13/2006 10:39:23 AM)
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ORIGINAL: Rule So? I never trust the phantasies of physicists. I probably invented a many-worlds hypothesis myself in the mid-eighties - but must have discarded it for its logical impossibility. It is exponentially worse than the problem of who created the Creator. I don't trust the fantasies of physicsts, either. Physicists don't have many fantasies when it comes to the real world. They tend to be super realists. Many-Worlds is not a fantasy. I trust physicists description of reality. They are the brightest humans on Earth. So, I generally do trust what physicists say. I see nothing illogical about Many-Worls. You have not stated why you believe it is logically impossible, so I can't respond to your claim. Nor is it exponentially worse than the problem of who created the Creator. There is no reason to accept a supernatural explanation when there is perfectly good natural explanation. quote:
Undoubtedly I do not comprehend the theory. Before you dispute a physics' theory supported by many world-reknown phyisicsts, you should first make an effort to understand it, and know what it really says. > However, if it entails that all choices / possibilities are realized, > then yes it is completely deterministic. It does. > Now cut away that googol of superfluous universes The other universes are not superfluous, but necessary. Given infinite time everything will happen, even the least likely thing. Religious people are always trying to limit the universe. > that clutter reality until you have only our one universe. If you assume a true assertion untrue, you can prove anything. > If we cannot communicate / interact with those other universes We can. First, learn the theory, then disagree with it. > they by definition do not exist. Not true. By your definition of existence, the past does not exist, nor do black holes beyond their even horizons, nor any part of our universe outside our light cone, because we have no way of interacting with these things. > Is our single universe than still completely deterministic? If you assume a true assertion untrue, you can prove anything. The universe includes multiverses. So, yes our universe is completely determinstic. If you don't look at the entire meta-verse, then our universe could look random. quote:
ORIGINAL: WhipTheHip Schrodinger's equation is completely deterministic. > You probably say so because of these three assumptions: Negative. I say so because Schrodinger's equation is completely determinstic. It is a mathematical function that yields only one answer for any given point in time. > a. [The wavefunction has] an observer-independent objective existence and actually is the object. I don't know what you are trying to say. Observers have nothing to do with Schordinger's equation. > b. The wavefunction obeys the empirically derived standard linear deterministic wave equations at all times. Again, I don't know what you are saying. > c. The observer plays no special role in the theory and, consequently, there is no collapse of the wavefunction. True. > These are sensible assumptions. Does a tree make noise when it falls in the forest while no-one is around? Yes. If you reject Many Worlds, then nothing exists when no-one is around. This is one of Einstein's main objections to Borh's interpretation of QM. Einstein said, the moon exists even when no one is looking at it. Bohr and Heisenberg and every other phycist in the world agrees that if Bohr and Heisenbergs interpretation of QM is correct, then the moon does not exist when it is not being observed. This is patently absurd. This means the universe did not exist until there were observers to observe it. > But: when a particle of radiation interacts with a particle of matter, there is an observer, > to wit the particle of matter; the wave function does collapse. Not according to many-worlds. Particles do not qualify as observers. And this still leaves open the question of the existence of reality between interactions. According to you, nothing exists between interactions. But you raise an interesting point. I will have to do some research before I can fully respond to this suggestion. The suggestion is we do away with observers and measurements and just say the wave-function collapses whenever matter and energy interact. This is a good question. I will try to find ann answer to it. > Even without an observer the noise that the falling tree makes will affect > its immediate surroundings. Not according to the Coppenhagen Interpretation of of Quantum Mechanics. > When you aim a quantum mechanical particle at an obstruction with two > holes in it, it will go through both holes. How can one particle go through two holes a billion mile a part? > Once on the other side, though, there are not two particles, but only > the single one. Then how do you explain the interferance pattern. The double-slit experiment is the best proof of Many-Worlds. According to many- worlds, the particle goes through one slit in one world, and the other slit in another world. According to the mathatmaics, the two universes will interact and produce an interferance pattern which is exactly what we observe. Hence, the double- slit experment proves the existence of many worlds. > From this we must conclude that the universe will walk all paths > to arrive at its destination, but that there is only a single destination - > and that destination is determined by non-deterministic interference. No physicist in the world would agree with this statement. If this were true, you would not get an interference pattern on the wall between the two-slits. By interferance pattern, I mean a pattern of light and dark bands. If your theory was right, we would observe the following on a screen behind the two-slits: two dark bands directly behind each slit, and the bands would gradually get lighter and lighter, further and further away from each slit. But this is not what we observe. Even if shoot one photon or particle at a time at the two slits, we still get an interference pattern. > Weinberg says about quantum theory: > "The final approach is to take the Schrodinger equation seriously > [..description of the measurement process..] In this way, a measurement > causes the history of the universe for practical purposes to diverge into > different non-interfering tracks, one for each possible value of the > measured quantity. [...] I prefer this last approach" Weinberg believes in Hugh Everett's Many-Words. This is what he is saying here. And even though the universes don't interfere with each other, they do in the double-slit experiment. If you knew the many-worlds theory, you would understand why. I can't teach you the whole theory here. Cheers, Michael
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