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Hi

What is the physical interpretation of Feynman path integral?

Thanks

What is the physical interpretation of Feynman path integral?

Thanks

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- #1

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Hi

What is the physical interpretation of Feynman path integral?

Thanks

What is the physical interpretation of Feynman path integral?

Thanks

- #2

marcus

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here is one view: it does not have a physical interpretationFeynman said:Hi

What is the physical interpretation of Feynman path integral?

Thanks

because it is a way of calculating a sometimes very close approximation

but nature does not know or care how we calculate

she does something, we dont know exactly how

and we have this way of calculating that gets the right answer

it's like virtual particles---maybe they dont exist in nature but they are good to calculate with

it's like feynmann diagrams: maybe nature doesnt know about them---she doesnt need to because she has her own way of doing things without perturbation series----maybe nothing in nature corresponds to feynmann diagrams---they are useful, tho, for organizing the calculation of a perturbation expansion.

that is just one viewpoint

hopefully someone else will provide a contrasting one

BTW Feynmann, if you havent already I invite you to have a look in this Quantum Physics forum

at the electroweak conversation between turin and zephram.

if zephram answers on this thread it will probably be interesting

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- #3

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But I know that the path integral have a physical interpretation but i don't know

- #4

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I'm interested by the subject but I didn't find the post of turin and zephram. Can you give me a link please?

- #5

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Read Feynman and Hibbs' book "Path Integrals." The introduction should satisfy your curiosity.

- #6

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So can u tell me about the physical interpretation of the path integrals :@

- #7

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It relational to the many 'sum-over-history' interpretation also by Feynman.

For instance:The fundamental question in the path integral (PI) formulation of quantum mechanics is:If the particle is at a position q at time t = 0, what is the probability amplitude that it will be at some other position q0 at a later time t = T?

This I took from this good paper:http://arxiv.org/PS_cache/quant-ph/pdf/0004/0004090.pdf [Broken]

If you read through it, you can form your own viewpoint, interpretation is open to a vast number of probibilities, every path has many (integral-able)(connecting) histories!

PS the original paper by Feynman was rejected!

For instance:The fundamental question in the path integral (PI) formulation of quantum mechanics is:If the particle is at a position q at time t = 0, what is the probability amplitude that it will be at some other position q0 at a later time t = T?

This I took from this good paper:http://arxiv.org/PS_cache/quant-ph/pdf/0004/0004090.pdf [Broken]

If you read through it, you can form your own viewpoint, interpretation is open to a vast number of probibilities, every path has many (integral-able)(connecting) histories!

PS the original paper by Feynman was rejected!

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I see the link. can you tell me how did dirac observed the action plays a central role???

(also the difference between lagrangian and hamiltonian interpretation)

Tanks in advanced.

- #9

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You might want to start off reading some of these introductory articles by EF Taylor

http://www.eftaylor.com/leastaction.html

and watching some of Feynman's lectures in Auckland (which became "QED")

http://www.vega.org.uk/series/lectures/feynman/ [Broken]

http://www.eftaylor.com/leastaction.html

and watching some of Feynman's lectures in Auckland (which became "QED")

http://www.vega.org.uk/series/lectures/feynman/ [Broken]

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- #11

marcus

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hi meldi, sorry I didnt respond earlier, I will get a link to thatmeldi said:

I'm interested by the subject but I didn't find the post of turin and zephram. Can you give me a link please?

electroweak thread in the Quantum Physics forum

here's the part of my post that I think you are responding to:

the thread begins here:...BTW Feynmann, if you havent already I invite you to have a look in this Quantum Physics forum

at the electroweak conversation between turin and zephram.

if zephram answers on this thread it will probably be interesting...

https://www.physicsforums.com/showthread.php?t=31857

first Duct Taper says something

then Zephram replies

then Turin says "I would like to hear a little more..."

it is really turins perceptive questioning that elicits the good exposition

that thread is a model of what I wish we had more of

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- #12

dlgoff

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Yes indeed. I followed that thread and was fascinated by zephram. Thanks zephram.marcus said:...that thread is a model of what I wish we had more of

Regards

- #13

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RE: "So i don't have the Feynman Hibbs book "

Then buy it, or check it out from the library.

Then buy it, or check it out from the library.

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thank you very much Marcus!

- #15

selfAdjoint

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I bought Feynmann Hibbs about ten years ago. I can't really say it helped me understand field theory. The book that really made a breakthrough for me (YMMD) was Hatfield,JohnDubYa said:RE: "So i don't have the Feynman Hibbs book "

Then buy it, or check it out from the library.

- #16

Haelfix

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I still love A Zee's book, Quantum field theory in a Nutshell. Its a very quick read, is wonderfully intuitive and quite deep. You pretty much have the path integral thrown at you right from the getgo, and its only a few chapters before its almost fully justified.

- #17

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How we can interprate for exemple the excat solution of Shrodinger equation for harmonic oscilator by Feynmanpath integral?

which is very complex

- #18

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OHHHHH

If i can't buy the book, what i do?

If i can't buy the book, what i do?

- #19

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what is the probabilisitic point view about path integral?

- #20

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Please what is the probabilisitic point view about path integral?

- #21

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What is the relation between Manifolds and the path integral?

Thanks

Thanks

- #22

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What is the differential geometry role on path integral?

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The probability of travelling from one point to the other is the sum over all paths between them of the probability of travelling along that path; The path integral is basically just that sum over paths.Feynman said:Please what is the probabilisitic point view about path integral?

- #24

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So can we consider that the path integral is an integral over manifolds?

- #25

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So can we consider that the path integral is an integral over manifolds?

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