Explicitly stable Fundamental Measure Theory models for classical density functional theory

Abstract

The derivation of the state of the art tensorial versions of Fundamental Measure Theory (a form of classical Density Functional Theory for hard spheres) are re-examined in the light of the recently introduced concept of global stability of the density functional based on its boundedness (Lutsko and Lam, Phys. Rev. E 98, 012604 (2018)). It is shown that within the present paradigm, explicitly stability of the functional can be achieved only at the cost of giving up accuracy at low densities. It is argued that this is an acceptable trade-off since the main value of DFT lies in the study of dense systems. Explicit calculations for a wide variety of systems shows that a proposed explicitly stable functional is competitive in all ways with the popular White Bear model while sharing some of its weaknesses when applied to non-close-packed solids.

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Cited by in corpus (6)

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• Classical Density Functional Theory applied to the solid state
• The direct correlation function of a crystalline solid
• Neural Density Functional Theory in Higher Dimensions with Convolutional Layers
• Classical Density Functional Theory in the Canonical Ensemble
• Hard disks confined within a narrow channel