Exact Density Functional for the Non-Relativistic Particle Energy in the Local External Field

Details Exact Density Functional for the Non-Relativistic Particle Energy in the Local External Field Exact Density Functional for the Non-Relativistic Particle Energy in the Local External Field

2011-03-23

arxiv.org/abs/1103.4586v1

Physics

Condensed Matter

Statistical Mechanics

6 pages, 0 figures

Scientific paper

Based on the Schrodinger equation, exact expressions for the non-relativistic particle energy in the local external field and the external field potential are derived as inhomogeneous density functionals. On this basis, it is shown that, when considering more than two noninteracting electrons, the energy of such a system cannot be an inhomogeneous density functional. This means that the Hohenberg-Kohn lemma which assert that in the ground state to each inhomogeneous density corresponds only one potential of the external field cannot be a justification of the existence of the universal density functional in the general case. At the same time, statements of the density functional theory remain valid when considering any number of noninteracting ground-state bosons due to the Bose condensation effect.

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