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Homework Help: [QFT] Divergent Green's function?

  1. Mar 6, 2010 #1
    1. The problem statement, all variables and given/known data

    I am being asked to consider a Dirac spinor with two complex components and the following Lagrangian:

    [tex]L = L_{Dirac}-\stackrel{g}{4}{(\psi\bar{\psi})^{2}}[/tex]

    I am asked to derive the Feynman rules for this theory which I can do using the standard methods. However, I am also asked to "classify the divergent Green's functions". Can anybody tell me what this question wants me to do? I am drawing a bit of blank here and googling "divergent Green's functions" isn't leading to a whole lot of useful information.

    2. Relevant equations



    3. The attempt at a solution
    1. The problem statement, all variables and given/known data



    2. Relevant equations



    3. The attempt at a solution
     
  2. jcsd
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