What question did this study set out to answer?

The aim is to establish a formal correspondence between coupled-cluster and Green's function many-body perturbation theories.

Connection between GW and Extended Coupled Cluster

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Randomized trial establishes a connection between GW and extended coupled cluster methods, suggesting new methods in electronic correlation.

The aim is to establish a formal correspondence between coupled-cluster and Green's function many-body perturbation theories.
Investigated the equivalence of GW approximation and equation-of-motion treatment of direct-ring coupled-cluster doubles (drCCD).
Developed an extended coupled cluster (ECC) ansatz connecting both frameworks.
Explored the incorporation of vertex corrections within the CC framework.
Demonstrated that the GW approximation corresponds to drCCD methods, enhancing the understanding of electronic correlations.
Provided a unified ECC framework that connects CC and MBPT.
Showed potential for systematically improvable Green's function approaches through this new formulation.

Tölle et al. (2026) studied this question.

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Randomized trial establishes a connection between GW and extended coupled cluster methods, suggesting new methods in electronic correlation.