A correction method for the pair density to get close to the ground state one

Details A correction method for the pair density to get close to the ground state one A correction method for the pair density to get close to the ground state one

2011-05-03

arxiv.org/abs/1105.0461v1

Physics

Condensed Matter

Strongly Correlated Electrons

Scientific paper

We present a correction method for the pair density (PD) to get close to the ground state one. The PD is corrected to be a variationally-best PD within the search region that is extended by adding the uniformly-scaled PDs to its elements. The corrected PD is kept N-representable and satisfies the virial relation rigorously. The validity of the present method is confirmed by numerical calculations of neon atom. It is shown that the root-mean-square error of the electron-electron interaction and external potential energies, which is a good benchmark for the error of the PD, is reduced by 69.7% without additional heavy calculations.

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