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Jun 7, 2019 at 13:14 comment added Jack @Sunyam Hartree self-energy appeared only in $\Sigma$, $U$ is viewed as the external perturbation term to using the functional derivative technique and can be diminished in the last stage by taking $U \rightarrow 0$.
Jun 6, 2019 at 17:58 comment added Sunyam Looks like you are double counting Hartree self energy by including it both in $U$ and $\Sigma$?
Jun 5, 2019 at 23:42 history edited Jack CC BY-SA 4.0
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Jun 5, 2019 at 9:04 vote accept Jack
Jun 5, 2019 at 9:03 history answered Jack CC BY-SA 4.0