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A modified version of the Moller-Plesset approach for obtaining thecorrelation energy associated to a Hartree-Fock ground state is proposed. Themethod is tested in a model of interacting fermions that allows for an exactsolution. Using up to third order terms improved results are obtained, evenmore accurate in the limit of loosely bound particles. This result suggests thepossible convenience of the scheme for the study of chemical bound problems.Comment: 10 pages, 1 figur

Proposal for a modified Møller-Plesset perturbation theory