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Post by Baron von Lotsov on Dec 5, 2022 1:11:44 GMT
It's the theory of everything except gravity. I found a simple qualitative description of it in this video.
But the real fun begins when you do it mathematically. If you like maths and have nothing better to do on these dark winter evenings, you can learn all about it from first principles. This is an entire lecture series which starts at the beginning and hopefully by the end of it you will know how to do it yourself.
It brings in a lot of concepts which might not always e clear but you can reference them in Wikipedia. Wikipedia has an excellent coverage of mathematics. An interesting side note is that if you fix the spacial coordinates in your space time 4 vector you find it reduces to the Schroedinger equation which gives you the time evolution of a quantum system. The QFT is a generalisation of it and is built using relativistic effects known as the Lorentz transformation, as per special relativity.
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Post by Orac on Dec 5, 2022 13:29:23 GMT
Moderator note -
Posters are reminded that this conversation is in mind zone and so only replies that are pertinent to the topic are allowed. Taking the micky is also forbidden.
Two posts that weren't talking about quantum field theory removed.
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Post by Baron von Lotsov on Dec 5, 2022 22:25:04 GMT
By the way, notice the maths does not have any numbers in it except I think for a zero in one or two bits of notation. Mathematicians say this is a sign of "proper maths". A lot of people think maths is about numbers, but it is much more than that. This is highly abstract.
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Post by piglet on Dec 5, 2022 22:36:16 GMT
Einstein once said that if you cant explain complex whatever, to an eight year old, then you dont understand it yourself. I havent a clue what your talking about Baron. Considering youve taken the trouble to post the above, and you want to teach, then i would appreciate an explanation that an eight year old would understand.
You would not want people to think you dont understand it yourself. Of what significance is your second post.? In conjuction with the first.?
In anticipation os learning summat, the pig.
To launch into obscurity, blaming the reader, or a lack of knowledge on the readers part, wont do, and is a big fail. You obviously thought the reader would understand it. Not so, is it.?
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Post by Baron von Lotsov on Dec 5, 2022 23:39:33 GMT
Einstein once said that if you cant explain complex whatever, to an eight year old, then you dont understand it yourself. I havent a clue what your talking about Baron. Considering youve taken the trouble to post the above, and you want to teach, then i would appreciate an explanation that an eight year old would understand. You would not want people to think you dont understand it yourself. Of what significance is your second post.? In conjuction with the first.? In anticipation os learning summat, the pig. To launch into obscurity, blaming the reader, or a lack of knowledge on the readers part, wont do, and is a big fail. You obviously thought the reader would understand it. Not so, is it.? It's a field which is invisible and extends throughout all of space, and is the thing which enables particles like electrons and protons to exist. Each particle has its associated field. The field generates a particle if the energy in the field at a certain point is equal to the energy of the particle. A field is a mathematical term which would model a quantity in space, like lets say light intensity. At each point in space you get a particular brightness of light so you can model that with a function which takes your x,y,z coordinates and returns a light level. A field can represent any quantity, but in this case it is an abstract quantum field. So we have this model and we find that it can predict all sorts of behaviour, like where a particle decays through radioactive decay. |
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Post by piglet on Dec 6, 2022 10:48:03 GMT
Oh, i get it. Like the universe is connected, and this explains how. Its like the universe is a single organism. Or that god sees a sparrow fall, how can god fail too? religion has been there got the T shirt. It shows why " being good" and turning the other cheek is the way to go.
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Post by besoeker3 on Dec 6, 2022 18:46:29 GMT
Einstein once said that if you cant explain complex whatever, to an eight year old, then you dont understand it yourself. I havent a clue what your talking about Baron. Considering youve taken the trouble to post the above, and you want to teach, then i would appreciate an explanation that an eight year old would understand. You would not want people to think you dont understand it yourself. Of what significance is your second post.? In conjuction with the first.? In anticipation os learning summat, the pig. To launch into obscurity, blaming the reader, or a lack of knowledge on the readers part, wont do, and is a big fail. You obviously thought the reader would understand it. Not so, is it.? Do many people read and understand this? Or are you just trying to assert your superior intellect for no other reason? |
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Post by Orac on Dec 6, 2022 19:45:25 GMT
Piglet,
Bear in mind that all of physical theory is just a maths model that proves itself useful in prediction. When you see a science demonstration that likens space to stretched rubber mat, there is no 'rubber mat like thing' that extends in all space; when science talks about spacetime being curved, there is no identified *thing* that gets bent by another 'thing'. The mat and the bending are just analogies and are there to demonstrate the maths model visually.
If you want to make a physicist look uncomfortable, ask him what space and time are - if he gives you answer that involves the word 'extension', ask him what an extension is.
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Post by Tinculin on Dec 6, 2022 22:53:25 GMT
“If you think you understand quantum mechanics, you don't understand quantum mechanics.” - Richard Feynman
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Post by Baron von Lotsov on Dec 7, 2022 15:10:10 GMT
Einstein once said that if you cant explain complex whatever, to an eight year old, then you dont understand it yourself. I havent a clue what your talking about Baron. Considering youve taken the trouble to post the above, and you want to teach, then i would appreciate an explanation that an eight year old would understand. You would not want people to think you dont understand it yourself. Of what significance is your second post.? In conjuction with the first.? In anticipation os learning summat, the pig. To launch into obscurity, blaming the reader, or a lack of knowledge on the readers part, wont do, and is a big fail. You obviously thought the reader would understand it. Not so, is it.? Do many people read and understand this? Or are you just trying to assert your superior intellect for no other reason? I thought you might. You told me you did some maths degree. |
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Post by Baron von Lotsov on Dec 7, 2022 15:13:23 GMT
Piglet, Bear in mind that all of physical theory is just a maths model that proves itself useful in prediction. When you see a science demonstration that likens space to stretched rubber mat, there is no 'rubber mat like thing' that extends in all space; when science talks about spacetime being curved, there is no identified *thing* that gets bent by another 'thing'. The mat and the bending are just analogies and are there to demonstrate the maths model visually. If you want to make a physicist look uncomfortable, ask him what space and time are - if he gives you answer that involves the word 'extension', ask him what an extension is. I did a thread on space on the old forum. It can get very complicated. In the video he deals with Hilbert spaces (capital H notation). |
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Post by piglet on Dec 7, 2022 16:52:48 GMT
I am for hilbert, not a capital. There is every reason to believe that the Universe is infinite, there is no bend anywhere. Measurements have been made from one point in the universe to another, across vast distances, no bend has ever been detected.
Like a rugby ball might be seen close up as being flat, taking measurements from different addresses on the rugby ball would register a bend, however small, so going in any direction infinately would result in an infinite journey.
That appeals to me enormously, and is so romantic. As with maths, there is no limit, just keep adding a zero to any number. In the 80s it was established that the rules of the universe are universal, a surprise for me. It may change though in a way like water freezing, and that a fish wont be able to enter an iceberg.
So what if the universe, and life therefore is infinite? Can god have limits, where god ends and something else begins.? Even that a new beginning of something else other than god or the universe, proves that all is infinite. You cant have summat, then nowt. And we are definately summat.
And as we exist, then we always have and always will. Into infinity.
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Post by Orac on Dec 7, 2022 17:09:53 GMT
Hear hear
A universe of infinite extent means there must be an infinite number of you and an infinite number of these exact conversations taking place between differing versions of the same people.
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Post by besoeker3 on Dec 7, 2022 17:49:20 GMT
Do many people read and understand this? Or are you just trying to assert your superior intellect for no other reason? I thought you might. You told me you did some maths degree. Yes I did among other things including a business degree but I just don't think it is appropriate for a forum like this. |
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Post by Baron von Lotsov on Dec 7, 2022 19:26:19 GMT
I thought you might. You told me you did some maths degree. Yes I did among other things. I just don't think it is appropriate for a forum like this. This is like an educational section. The rest of the forum is the same old same old endless arguments. I get bored with it so I'm leaning quantum field theory. You may find it interesting. The professor in the lecture knows his stuff and is a very good mathematician, not a bullshitter like many on Youtube. There are tons of other lectures on similar maths on his channel as well.
As regards politics, well yes i know very few scientists and engineers exist in the House of Commons, most are completely mathematically illiterate. It is not the same picture in many other countries though so perhaps this sort of thing might interest them. Many of the errors caused today in running the country come from errors to do with logic, and maths is all logic. It makes you think more precisely and in more complex ways.
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