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Wilsonian effective field theory

  1. May 31, 2010 #1
    Hi,

    could anyone explain to me why in effective field theory (as in ch29 srednicki), you look at diagrams with only [tex]k<\Lambda[/tex] as external lines and [tex]k>\Lambda[/tex] for your interal lines? why do these diagrams with say, 6 external legs of this type, equate to the constant [tex] c_6 [/tex] say? In previous chapters of the book it's usually the exact 6 point vertex function that would equate to such a diagram, not the 6 point coupling constant itself etc.

    I understand the math behind what Srednicki is doing, but not sure I understand what he is actually trying to do here, so all comments on this whole topic in QFT would be great.

    thanks
     
  2. jcsd
  3. May 31, 2010 #2
    I second that! :-)
     
  4. Jun 2, 2010 #3
    Hah, anyone out there know how this stuff works?
     
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