## Student Friendly Quantum Field Theory

book in progress

Study matter and its motion through spacetime...

### Student Friendly Quantum Field Theory

I came across this website, with some draft material for a QFT book. Looks like pretty good stuff - I wish these sorts of things had been around when I was doing this stuff. I had to make do with Bjorken and Drell
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twistor59
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### Re: Student Friendly Quantum Field Theory

Ooh, shiny!
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tnjrp

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### Re: Student Friendly Quantum Field Theory

twistor59 wrote:I came across this website, with some draft material for a QFT book. Looks like pretty good stuff - I wish these sorts of things had been around when I was doing this stuff. I had to make do with Bjorken and Drell

Thanks
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### Re: Student Friendly Quantum Field Theory

Thank you. The lecture by Roman Jackiw on fractional charges is interesting, I just finished precalculus so i didn't understand everything but it did trickle through.
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### Re: Student Friendly Quantum Field Theory

If a particle is being detected with a photon having wavelength of the order x, where the particle is much larger than x(leading to accuracy in position), we find that the 'momentum imparted to this particle by the photon'(inversely proportional to wavelength) renders our measurement of its momentum inaccurate.

But since there is a simple formula for calculating the momentum of the photon, can we not compensate for the same in our results?

As before, I realize that these problems have already been worked out by the scientific community but an explanation would help further my understanding of this basic tenet of quantum theory.

Thank You
Rohit
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### Re: Student Friendly Quantum Field Theory

godsfavson wrote:If a particle is being detected with a photon having wavelength of the order x, where the particle is much larger than x(leading to accuracy in position), we find that the 'momentum imparted to this particle by the photon'(inversely proportional to wavelength) renders our measurement of its momentum inaccurate.

But since there is a simple formula for calculating the momentum of the photon, can we not compensate for the same in our results?

As before, I realize that these problems have already been worked out by the scientific community but an explanation would help further my understanding of this basic tenet of quantum theory.

Thank You
Rohit

If I want to compensate for (any component of) the imparted momentum from the photon, I need to know (that component of) the momentum of the photon. But if I know that component of the momentum, I don't know where the photon is (in that coordinate), so I don't get the required position information from the scattering event.
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twistor59
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### Re: Student Friendly Quantum Field Theory

twistor59 wrote:I came across this website, with some draft material for a QFT book. Looks like pretty good stuff - I wish these sorts of things had been around when I was doing this stuff. I had to make do with Bjorken and Drell

Sweet find.

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### Re: Student Friendly Quantum Field Theory

Kewl stuff.

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### Re: Student Friendly Quantum Field Theory

hey,
I would like to know if i can consult with someone about solutions to the problems apear in Mark Srednicki's book "Quantum field theory"
Thanks
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### Re: Student Friendly Quantum Field Theory

Daniel wrote:hey,
I would like to know if i can consult with someone about solutions to the problems apear in Mark Srednicki's book "Quantum field theory"
Thanks

I don't have a copy of Srednicki. You could try posting the questions - maybe someone could answer. Or try http://www.physics.stackexchange.com
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twistor59
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### Re: Student Friendly Quantum Field Theory

Very nice. Thanks for the link

You can also learn QFT directly from Prof. Alan Guth on MIT's ocw :

http://ocw.mit.edu/courses/physics/8-32 ... ring-2008/

Also check out many other interesting courses on the ocw.
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