Berthold-Georg Englert, Jun Hao Hue, Zi Chao Huang, Mikołaj M. Paraniak, Martin-Isbjörn Trappe
Abstract
Density functional theory is usually formulated in terms of the density in configuration space. Functionals of the momentum-space density have also been studied, and yet other densities could be considered. We offer a unified view from a second-quantized perspective and introduce a version of density functional theory that treats all single-particle contributions to the energy exactly. An appendix deals with semiclassical eigenvalues.