From two-body Green's function to one-body in perturbation theory

In summary, the speaker is attempting to derive the Hedin's equations for GW on their own, but has come across an equation that they cannot derive or find a source for. They are asking for help in understanding the derivation or for a link to a document with a full derivation.
  • #1
forever_physicist
7
1
Hi guys! I am trying to derive the Hedin's equations used for GW on my own, and I found this equation, but I cannot really derive it, nor find a source where they explain how this can be derived (they link to other papers that in the end don't show where this is coming from). The equation I am talking about is:
$$G(1,3,2,3^+) = G(1,2)G(3,3^+)-\frac{\delta G(1,2)}{\delta \phi(3)}$$
Can somebody tell me how this can be derived or just link me to a document with a full derivation?
Thanks!
 
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