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latentcorpse
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Consider question 1 in this paper:
http://www.maths.cam.ac.uk/postgrad/mathiii/pastpapers/2002/Paper65.pdf
How do we "read off" the Feynman rules? I can see that the interaction terms give contributions [tex]\lambda_3 , \lambda_4 , \lambda_6[/tex] to the relevant 3,4 and 6 point vertices respectively.
How do we get the propagator out of this without doing any calculations?
Or indeed, if we were asked to do a calculation to find it, what would it be?
Am I correct in assuming that the only Feynman rules we can deduce from this is the vertex and propagator terms? Or are there other things we could write? Such as "integrate over undetermined loop momenta, etc..."
Thanks.
http://www.maths.cam.ac.uk/postgrad/mathiii/pastpapers/2002/Paper65.pdf
How do we "read off" the Feynman rules? I can see that the interaction terms give contributions [tex]\lambda_3 , \lambda_4 , \lambda_6[/tex] to the relevant 3,4 and 6 point vertices respectively.
How do we get the propagator out of this without doing any calculations?
Or indeed, if we were asked to do a calculation to find it, what would it be?
Am I correct in assuming that the only Feynman rules we can deduce from this is the vertex and propagator terms? Or are there other things we could write? Such as "integrate over undetermined loop momenta, etc..."
Thanks.
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