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physics.chem-ph2024
Review of the foundations of time-dependent density-functional theory (TDDFT)
Jochen Schirmer
Time-dependent density-functional theory (TDDFT) is deemed to be a formally rigorous way of dealing with the time-evolution of a many-electron system at the level of electron densi…
physics.chem-ph2023
Non-interacting particle systems in the bi-orthogonal and unitary coupled-cluster description
Jochen Schirmer
Adapting a veritable many-body method to a system of non-interacting particles (NIP), while being trivial from a physical point of view, can be of interest with regard to methodolo…
physics.chem-ph2023
The electron propagator for non-interacting particles: An alternative approach to quasi-degenerate perturbation theory (QDPT)
Jochen Schirmer
This article presents an alternative formulation of quasi-degenerate perturbation theory (QDPT). The development results by simplifying established many-body (MB) techniques to sys…