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I was talking with a mathematician colleague and promised to look up a concept in QFT for them but am not sure what they were referring to. They were referring to rules named after two people (both of them having names beginning with a c or a k by the sound of it) which can be used to 'split up' Feynman diagrams such that you end up resolving the path integral into a complex and a real part or something along those lines. I am not sure what they mean by this or if they are referring to splitting functions.

Obviously, if I search for rules and Feynman diagrams, I just get information on the Feynman rules.

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    $\begingroup$ perhabs you are looking for something like this? physics.stackexchange.com/q/303921 $\endgroup$ – thi Feb 19 at 8:35
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    $\begingroup$ Cutkosky cutting rules (isn't the alliteration a funny coincidence!) $\endgroup$ – innisfree Feb 19 at 8:49
  • $\begingroup$ (But maybe we wouldn't have called them cutting rules if he'd had another name) $\endgroup$ – innisfree Feb 19 at 8:49
  • $\begingroup$ Sounds a bit like the BCFW recursion relations? $\endgroup$ – Ryan Thorngren Feb 19 at 10:31
  • $\begingroup$ Yes, it's the Cutkosky rules, it sounded like two names the way she said 'Cutkosky cutting'. $\endgroup$ – Tom Feb 19 at 12:24

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