On the Construction of Size Extensive Effective Hamiltonians in General Model Spaces Using Quasi-Hilbert and Quasi-Fock Strategies

摘要: There has been an ever-growing interest over the last two decades towards developing and implementing formalism of effective hamiltonians [1] in framework many-body perturbation theory (MBPT) coupled cluster (CC) [2, 3]. One major thrust all these developments desire to obtain size-extensive Heff which give energies upon diagonalization within model space. The traditional formulations both MBPT [4] CC [5–9] for open-shells were built complete spaces (CMS), a connected could be obtained formalisms. on automatically owing completeness