Auxiliary Field Representation of Fermion Kinetic Energy Density Functional *

J. K. Percus

Research output: Chapter in Book/Report/Conference proceedingChapter


The kinetic energy, or thermodynamic potential, of a non-interacting Fermion system, as a functional of the non-uniform density pattern evoked by an external potential, serves as a crucial tool in the analysis of interacting system ground states. Examples from classical lattice gas and continuum fluid theory are cited to show that analytic tractability can be dramatically enhanced by the introduction of auxiliary density fields with respect to which a suitable thermodynamic potential is stationary. This strategy is developed for the prototype of one-dimensional spinless Fermions, resulting in an exact highly overcomplete representation. A semi-classical variational ansatz recovers the familiar Thomas-Fermi plus renormalized Weiszacker expression, as well as leading corrections, and a simple extension creates a simple modification of the former. The corresponding 3-dimensional format is set up, and evaluated by extrapolation from the 1-dimensional case.

Original languageEnglish (US)
Title of host publicationAdvances in Quantum Chemistry
PublisherAcademic Press Inc.
Number of pages20
StatePublished - 1998

Publication series

NameAdvances in Quantum Chemistry
ISSN (Print)0065-3276

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry


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