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But I think the Correspondence Principle should be a general rule for all theories which yield greater insights. They must accommodate the theory they are replacing. Even the round Earth accommodates the flat Earth, but not vice-versa.
Thus, classical mechanics becomes a short-wave approximation of quantum mechanics,
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Dave_Oblad » January 18th, 2017, 5:17 am]I've said what I needed to say.. anything more would have to be redundant.
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hyksos » January 18th, 2017, 5:59 am wrote:I have a (amusing) PDF about this topic if this topic is of interest to you. In the PDF the author basically saysThus, classical mechanics becomes a short-wave approximation of quantum mechanics,
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rajnz00 » January 18th, 2017, 12:55 pm wrote:hyksos, according to Wikipedia, Semiclassical gravity treats matter fields as being quantum and the gravitational field as being classical. No great logic behind it and it apparently doesn't work.
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hyksos, from the link you have given, the Sokolov–Ternov effect does not appear to have any relation to semi classical gravity.
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Scientists Create A New Kind Of Matter: Time Crystals
two teams of researchers have figured out that crystals' repeating patterns can also exist through time. These "time crystals," detailed in a new paper in Physical Review Letter, are an entirely new kind of matter, one that can never reach equilibrium.
To create the time crystals, researchers at University of Maryland hooked together 10 ytterbium atoms and hit them with two lasers multiple times to keep them out of equilibrium. Though the atoms did settle into a pattern, they could not reach equilibrium, meaning that the crystals perpetually remain in motion, though they don't contain any energy. Almost all of physics is based in studying matter that is at equilibrium, so the ability to create these non-equilibrium crystals is a huge deal for the future of physics.
"This is a new phase of matter, period, but it is also really cool because it is one of the first examples of non-equilibrium matter," lead researcher Norman Yao from the University of California, Berkeley told EurekaAlert!.
The idea of time crystals—a form of matter that appears to move even at its energy-less ground state—was first proposed by Nobel-Prize winning theoretical physicist Frank Wilczek in 2012. Usually, if matter is in its ground state, movement should be impossible, because it contains no energy.
The researchers say that time crystals resemble Jell-O. When you tap Jell-O, it jiggles. The only difference is that the crystals are jiggling without using any energy, without any tap. By definition, time crystals can never stop oscillating, no matter how little energy they contain.
Right now, it's unclear what the practical use of this discovery will be [Yep but they will be huge. Stuff the discoverers could never dream of], but it's possible that these crystals could serve a function in quantum computers.
Source: Physical Review Letters via EurekaAlert!
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rajnz00 » January 30th, 2017, 10:53 pm wrote:Time Crystals - are these perpetual motion machines, that tap into the energy of space? The Big Bang?
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mitchellmckain on January 31st, 2017, 4:00 pm wrote: No they are not! They are driven by an external source of energy via the lasers. This is what is meant by a non-equilibrium state of matter -- constantly getting energy input from an external source.
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rajnz00 » January 31st, 2017, 3:37 pm wrote:mitchellmckain on January 31st, 2017, 4:00 pm wrote: No they are not! They are driven by an external source of energy via the lasers. This is what is meant by a non-equilibrium state of matter -- constantly getting energy input from an external source.
I see? Much like you taking a quartz crystal and tapping it continuously with a hammer? Maybe you could do that and produce a quantum computer.
Somehow I thought it was different. The lasers were only used to produce the effect and the crystals were in perpetual motion thereafter, though their atoms were in a ground state. But maybe you know better since you are so emphatic about it. Wonder what the fuss was all about?
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mitchellmckain on January 31st, 2017, 4:00 pm wrote: No they are not! They are driven by an external source of energy via the lasers. This is what is meant by a non-equilibrium state of matter -- constantly getting energy input from an external source.
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rajnz00 » January 31st, 2017, 4:25 pm wrote:mitchellmckain on January 31st, 2017, 4:00 pm wrote: No they are not! They are driven by an external source of energy via the lasers. This is what is meant by a non-equilibrium state of matter -- constantly getting energy input from an external source.
You are wrong about that, despite being so emphatic about it,
There is no "constantly getting energy input from an external source". There would be absolutely nothing spectacular about that. Very mundane like continuously hitting a quartz crystal with a hammer.
rajnz00 » January 31st, 2017, 4:25 pm wrote:And the difference with a quartz crystal is not "that instead of just vibrating without changing the crystalline structure, in the time crystal the molecules are actually moving to different locations in the whole structure." but that 1. the molecules in crystals of quartz are not in a ground state and 2. not in perpetual motion without an external power source.
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mitchellmckain on January 31st, 2017, 6:20 pm wrote: What you are thinking of is the original idea of a time-crystal in thermal equilibrium by Watanabe and Oshikawa which they proved could not actually exist.
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The duration between one coordinate and the next coordination is a man-made increment called time." What do you mean by that? What do you mean by the "next coordination?"
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