A unified diagrammatic formulation of single-reference and multi-reference random phase approximations: The particle-hole and particle-particle channels.

A diagrammatic multi-reference generalization of many-body perturbation theory was recently introduced [Wang et al., J. Phys. Chem. Lett. 16, 3047 (2025)]. This framework allows us to extend single-reference (SR) Green's function methods defined at t…

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