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GW approximation

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The GW approximation (GWA) is an approximation made in order to calculate the self-energy of a many-body system of electrons.<ref name=Hedin65>{{Cite journal|first=Lars |last=Hedin|s2cid=73720887|title=New Method for Calculating the One-Particle Green's Function with Application to the Electron-Gas Problem|doi=10.1103/PhysRev.139.A796|journal= Phys. Rev.|volume=139|year=1965|pages=A796–A823|issue=3A|bibcode = 19q46uq45yqrthsrthsrgnsfg


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