3 papers
physics.chem-ph2026
reduced density matrix from iterated linearized Dyson equation
Fabien Bruneval, Erik Verzijl, Arno Förster +1
Iterating the Dyson equation with the static part of the self-energy leads to a concise and possibly improved expression of the one-body reduced density matrix from any self-energy…
physics.chem-ph2025
Connections between Richardson-Gaudin States, Perfect-Pairing, and Pair Coupled-Cluster Theory
Paul A. Johnson, Charles-Émile Fecteau, Samuel Nadeau +2
Slater determinants underpin most electronic structure methods, but orbital-based approaches often struggle to describe strong correlation efficiently. Geminal-based theories, by c…
physics.chem-ph2024
Can Handle Multireference Systems?
Abdallah Ammar, Antoine Marie, Mauricio Rodríguez-Mayorga +2
Due to the infinite summation of bubble diagrams, the approximation of Green's function perturbation theory has proven particularly effective in the weak correlation regime, w…