feynman diagram

vincentchan

Is there a systematical way to count all the possible feynman diagram with vertices less than or equal to n......

vincentchan

one more question.... see the attachment.... are these two feynman diagram the same?

dextercioby

They're not.There are the 2 (distinct) contributions to the Compton scattering of electrons (if i saw well,or positrons in the other case).

To the first question:nope,in general u cannot tell how many distinct Feynman diagrams a QFT has in a certain order.U have to compute all possible unconnected Green functions,using the approximation for the generating functional.

Daniel.

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vincentchan	feynman diagram Tweet Is there a systematical way to count all the possible feynman diagram with vertices less than or equal to n......

dextercioby Blog Entries: 9 Recognitions: Homework Help Science Advisor	They're not.There are the 2 (distinct) contributions to the Compton scattering of electrons (if i saw well,or positrons in the other case). To the first question:nope,in general u cannot tell how many distinct Feynman diagrams a QFT has in a certain order.U have to compute all possible unconnected Green functions,using the approximation for the generating functional. Daniel.