I have been studying how to apply the Feynman rules for QED to various simple first order process (as prescribed by Griffiths' 'Introduction to Elementary Particles').(adsbygoogle = window.adsbygoogle || []).push({});

So far, all is well. I can follow the rules, and develop the results, and it all looks very clever. My problem is that so far, I feel like I'm just following a very well cut out recipe.

My question, therefore, is where is the physics? I am told to introduce a factor for each vertex, the electron propagator is so-and-so, etc. etc. This is all very well, but I'm not sure I feel satisfied with what I have learned until I understand at least the mathematical framework from whick the Feynman Rules derive, better still, the fundamental physics behind this framework.

Can anyone recommend where to look for these answers?

Cheers,

Simon

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# Feynman rules - where's the physics?

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