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By combining interface-pinning simulations with numerical integration of theClausius-Clapeyron equation we determine accurately the melting-linecoexistence pressure and fluid/crystal densities of the Weeks-Chandler-Andersen(WCA) system covering four decades of temperature. The data are used forcomparing the melting-line predictions of the Boltzmann,Andersen-Weeks-Chandler, Barker-Henderson, and Stillinger hard-sphereapproximations. The Andersen-Weeks-Chandler and the Barker-Henderson theoriesgive the most accurate predictions, and they both work excellently in thezero-temperature limit for which analytical expressions are derived here.

Comparing four hard-sphere approximations for the low-temperature WCA melting line