@kshegunov Quantum Mechanics



  • @kshegunov
    As per my post elsewhere, please don't hesitate to come here and ask me for my theories on quantum mechanics, which I'm sure you'd be really interested in... LOL ;-)


  • Qt Champions 2016

    Well, as this is the lounge (we are only missing the coffee machines) consider yourself asked. :)



  • This is a clear signal we need a new section of the forum:
    "The Dark Nerdy Cave"


  • administrators

    As long as no-one tries to look for a "Quantum mechanics" sub-forum we can assume it both exists and doesn't exist.
    Just please don't try to look for it.



  • @kshegunov
    LOL, I didn't mean it seriously. I am also well aware that the world is full of laymen with their own pet theories on quantum and other physics, all of which are almost certainly worthless/of no interest to anyone other than themselves.

    I also would like to say I appreciate your regular & informed input on the forums, and answers to my posts. I know I sometimes put in an OT comment, I do hope that does not detract --- I like the casual, friendliness here, I am used to stackoverflow where you get penalized or executed by hostile members for anything frivolous or not directly relevant....


  • Qt Champions 2016

    @JNBarchan said in @kshegunov Quantum Mechanics:

    LOL, I didn't mean it seriously. I am also well aware that the world is full of laymen with their own pet theories on quantum and other physics, all of which are almost certainly worthless/of no interest to anyone other than themselves.

    Perhaps, but the flat earth (conspiracy) theory is rather funny at least. ;)

    I also would like to say I appreciate your regular & informed input on the forums, and answers to my posts. I know I sometimes put in an OT comment

    Thanks!

    I do hope that does not detract

    You'd get a notice in chat if it does, or a moderator will fork it into another topic. I myself am rather lenient on that (see below).

    I am used to stackoverflow where you get penalized or executed by hostile members for anything frivolous or not directly relevant....

    Well, if that were the case here, @tekojo would've had put me on the chopping block more than anyone else ... :D



  • @JNBarchan said in @kshegunov Quantum Mechanics:

    I like the casual, friendliness here, I am used to stackoverflow where you get penalized or executed by hostile members for anything frivolous or not directly relevant....

    That even extends to Questions asked and anwered 100 times over. AKA:

    My Program works when it`s started from QtCreator but not when I click on the exe
    

    I'll blame that partially on the bad topic search of this forum, in most cases its easier to simply use google instead of the on side search ;-)


  • administrators

    @J.Hilk search is hard. I use google to search the forums too :)


  • Qt Champions 2016

    @tekojo said in @kshegunov Quantum Mechanics:

    I use google to search the forums too

    Don't we all ... ^_^
    Btw, a nice one on the QM forum's existence. It reminded me of this particular meme:



  • I will post my own fascinating queries in this thread in due course --- I have spent so much time in the forum today that I desperately need to do some actual work....!



  • @kshegunov said in @kshegunov Quantum Mechanics:

    but the flat earth theory is rather funny at least

    It's not funny man! they are lying to humanity!
    Flat Earth



  • @VRonin
    Yeah, well, I'm afraid so are the people I know who insist The Earth is about 4,000 years like in The Bible, evolution is not real, and dinosaurs either didn't exist and the bones have been "planted" or they lived about 3,500 years ago for a bit....



  • From what I read, its not so much the theory that earth is flat, but that all pictures/video we have of earth in space is made by NASA, and officially graphically revised which is actually true, and therefore #FakeNews.

    On that note #Live



  • @J.Hilk
    For the record, The Greeks (the ancient ones, not the ones in the EU who borrow a lot of money) knew it was curved and measured its radius purely from horizon/sun/"clock" stuff, so can't see how NASA can be blamed for faking it :)

    Whereas going to The Moon was clearly really just like Capricorn One....



  • @J.Hilk said in @kshegunov Quantum Mechanics:

    but that all pictures/video we have of earth in space is made by NASA

    http://www.bbc.co.uk/news/blogs-trending-30210230

    It's even a great south asian restaurant if you happen to be in the area



  • @kshegunov , and other physicists:
    OK then. 2 initial quantum questions:

    1. What does the empirical demonstration of Bell's Inequality Theorem thing tell me about the physical world I inhabit?

    2. So what actually happened when they did the experiment on Schrödinger's cat?


  • Qt Champions 2016

    @JNBarchan said in @kshegunov Quantum Mechanics:

    1. What does the empirical demonstration of Bell's Inequality Theorem thing tell me about the physical world I inhabit?

    Not much as far as I know. Just that there can be no hidden variables in a quantum-like theory. Can't elaborate much on it as I'm not that familiar with the whole formalism.

    1. So what actually happened when they did the experiment on Schrödinger's cat?

    As with any thought experiment - at the end of it they got a headache ;)

    The cat is just an metaphor that tries to illustrate the principle of superposition in QM, but many people fundamentally misunderstand it and think it's bizarre and/or wrong. Basically it boils down to a very simple idea - you have a system with 2 pure states (i.e. the cat is alive, or the cat is dead, you could make the argument with the electron spin all the same). In the closed system where there's no interaction with the outside world the state is a superposition of the two with some probability. When you measure you're no longer dealing with a closed system, that is the person/instrument that measures influences the system, and since there's now determinism involved (i.e. the act of measurement) the state of the system collapses to one of the pure states - the cat is either dead or alive.



  • @kshegunov
    Hi,

    I understand the Schrödinger cat idea, I don't think it's wrong. I just want to know which way it did actually turn out when opened the box on his cat?

    For the Bell/EPR thing, it's the implication of the "can be no hidden variables" that's intriguing, don't you think? What could quantum entanglement be? Are you more of a "Mathematical Physicist" rather than a "Philosophical Physicist"? ;-)


  • Qt Champions 2016

    @JNBarchan said in @kshegunov Quantum Mechanics:

    I just want to know which way it did actually turn out when opened the box on his cat?

    Well, either one way or the other. :)
    The point is you can't tell until you open the box.

    For the Bell/EPR thing, it's the implication of the "can be no hidden variables" that's intriguing, don't you think?

    I guess. I wouldn't trust theories that depend on hidden variables anyway, though. The whole point of science is to learn things, if we argue there exist things that can be neither measured, known or are otherwise hidden, we might as well go to church instead.

    What could quantum entanglement be?

    State coupling, which is pretty common. The typical (and quite known) problem, however, is not with entanglement itself. It's with the fact the QM is non-local, this mean everything (every process in QM) happens instantaneously in the whole of space, which is bizarre and hard to reconcile with.

    Are you more of a "Mathematical Physicist" rather than a "Philosophical Physicist"?

    Nuclear theory. Probably you could say I'm more of a mathematical physicist, I enjoy philosophy but am ultimately a practical man.



  • @kshegunov

    It's with the fact the QM is non-local, this mean everything (every process in QM) happens instantaneously in the whole of space, which is bizarre and hard to reconcile with.

    That's the bit I mean. And I assume a particle could in principle entangle with many others, and then any of them could influence it at the opposite side of The Universe. When they discover one day, I wonder what the "mechanism" will turn out to be....

    Probably you could say I'm more of a mathematical physicist, I enjoy philosophy but am ultimately a practical man.

    Yes I kind of guessed :) Being a layman, I am of course a purely philosophical amateur physicist!

    Nuclear theory.

    Ah ha! That's more like it! Right then: why haven't you figured practical nuclear fusion yet for the world's needs? You've had enough time now!


  • Qt Champions 2016

    @JNBarchan said in @kshegunov Quantum Mechanics:

    That's the bit I mean. And I assume a particle could in principle entangle with many others, and then any of them could influence it at the opposite side of The Universe. When they discover one day, I wonder what the "mechanism" will turn out to be....

    Yes, in principle it could. A group of Chinese scientists farily recently entangled two ensembles (please don't ask me to dig up the article it's quite late). Probably they'd discover QM is just an approximation ... just like what happened with classical mechanics and the relativistic corrections.

    Yes I kind of guessed :) Being a layman, I am of course a purely philosophical amateur physicist!

    No harm in that. :)

    Ah ha! That's more like it! Right then: why haven't you figured nuclear fission yet for the world's needs? You've had enough time now!

    Well I had a colleague that was working on that, he went into the private sector - there's just little money in science. Also we have figured it out ages ago, the problem is an engineering one, not a physical. For this you can ask the engineers around ... @Wieland, don't hide, why haven't you built the damn reactor already?! ;)



  • @kshegunov

    Ah ha! That's more like it! Right then: why haven't you figured nuclear fission yet for the world's needs? You've had enough time now!

    You quoted me before I had changed "fission" to "fusion", which is embarrassing! [Although it would be one way to solve all our needs :) ] I had also changed it to "practical nuclear fusion".

    So once it's "practical" you hand over to engineers?! It's their problem. What about you come with some nuclear science physics which aids the practicalities? I don't know, find I way to make it work much closer to room temperature, or with less need for input power? :) We have been waiting for like 50 years for this promised physics + technology, and it's always "20-odd years away".


  • Qt Champions 2016

    @JNBarchan said in @kshegunov Quantum Mechanics:

    So once it's "practical" you hand over to engineers?!

    It was just a jape.

    What about you come with some nuclear science physics which aids the practicalities?

    As far as I know, although it isn't my subspecialty, they're building a reactor currently in germany to test some ideas. They are hopeful, but you know ... we don't sell any guarantees ...

    We have been waiting for like 50 years for this promised physics + technology, and it's always "20-odd years away".

    That's what I told my colleague while he was still working on it. He replied he doubts it'd be less than 50 years before we actually have a real and industry grade solution on that.



  • @kshegunov

    although it isn't my subspecialty

    LOL :) So what exact area are you a physicist in, preferably in terms I can understand?


  • Qt Champions 2016

    Nuclear structure, I'm trying to model out the internal structure of the nucleus ... not so successfully as I'd like if I may add ... :}



  • @kshegunov
    Ah. Well I can help you there:

    1. Bunch of stuff in the centre. Sometimes it behaves oddly.
    2. Then lots & lots of empty space. Nothing there. Except maybe millions of virtual particles and dark energy.
    3. Then cloudy area sort of containing small stuff. Nothing's really where it seems to be.

    There, that should help, if you wish to use this in your work you are welcome. :)


  • Qt Champions 2016

    I promise to cite your contribution as any good scientist will do. :)

    Now I have to go to sleep before I fall asleep on the keyboard. Night!


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