Density functional, density matrix functional, and the virial theorem
On the basis of the virial theorem for finite motion of interacting electrons in a static external field, it is shown that ground-state energy is determined evidently by the one-particle density matrix. The exact expression for ground-state energy is found and can be applied to various problems, in particular, in studying the electronic structure of atoms, molecules, and other bound complexes.
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSIC↗