Pure Representability Problem and New Models of the Electronic Fock Space

Details Pure Representability Problem and New Models of the Electronic Fock Space Pure Representability Problem and New Models of the Electronic Fock Space

2001-08-06

arxiv.org/abs/physics/0108007v1

Physics

Chemical Physics

28 pages, submitted to Int. J. Quantum Chem

Scientific paper

New models of the Fock space sector corresponding to some fixed number of electrons are introduced. These models originate from the representability theory and their practical implementation may lead to essential reduction of dimensions of intermediate Configuration Interaction spaces. A certain zero-order theory that gives wave functions approximately equivalent to ones obtained by accounting all excitations from the Hartree-Fock reference state up to the q-th order is proposed. Simple numerical examples are given to illustrate the approach.

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