Analytic example of a free energy functional

Christian Tutschka, Gerhard Kahl
2000 Physical review. E, Statistical physics, plasmas, fluids, and related interdisciplinary topics  
We use the ideas of Percus for the construction of classical density functionals for two model interactions: simple hard spheres and adhesive hard spheres ͑AHSs͒. The required input, the properties of the uniform fluid, is taken from the analytic mean spherical solution for these two systems. For hard spheres we derive-via a bilinear decomposition of the direct correlation functions-a set of basis functions, which is the same as the one presented by Rosenfeld in his fundamental measure theory
more » ... amework. For AHSs additional basis functions have to be considered to ensure the bilinear decomposition of the direct correlation functions; we present an expression for the free energy functional for the one-component case.
doi:10.1103/physreve.62.3640 pmid:11088864 fatcat:d7ac5juqtfgivnhhiriy6x2oby