Bøhling, Lasse1; Bailey, Nicholas2; Schrøder, Thomas2; Dyre, J. C.2
1 The Department of Science, Systems and Models, Roskilde University2 IMFUFA, Department of Science and Environment, Roskilde University
This paper investigates two conjectures for calculating the density dependence of the density-scaling exponent γ of a single-component, pair-potential liquid with strong virial potential-energy correlations. The first conjecture gives an analytical expression for γ directly in terms of the pair potential. The second conjecture is a refined version of this involving the most likely nearest-neighbor distance determined from the pair-correlation function. The conjectures are tested by simulations of three systems, one of which is the standard Lennard-Jones liquid. While both expressions give qualitatively correct results, the second is more accurate.