Imagine I want to calculate the INTERACTING single particle Green function in a model:(adsbygoogle = window.adsbygoogle || []).push({});

\begin{eqnarray}

G(t-t')=\langle Td(t)d^{\dagger}(t')\rangle

\end{eqnarray}

We know from Dyson equation that this is:\\

\begin{eqnarray}

G=G_{0} + G_{0}\Sigma G

\end{eqnarray}

Where $\Sigma$ is the self-energy. My question is, if we want to calculate the correlator :\\

\begin{eqnarray}

g(t-t')=\langle Td(t)^{\dagger}d(t')\rangle

\end{eqnarray}

Does the self-energy $\Sigma$ change for this correlator? In my intuition it shouldnt, but maybe I am wrong... Thanks!

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# Self-energy for two correlators

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