Abstract
An augmented van der Waals theory is used to study the liquid-vapor coexistence and critical constants ${T}_{c}$, ${\ensuremath{\rho}}_{c}$, and ${P}_{c}$ of $^{4}\mathrm{He}$. The reference system is taken as hard spheres, the properties of which are computed by the path-integral Monte Carlo method. The results of this "mean-field" theory are shown to be in semiquantitative agreement with experiment. Predictions for the Lennard-Jones and HFDHE2 helium pair potentials are compared.
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