One-component plasma bridge function

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Abstract
A method for extending finite-range Monte Carlo simulation data obtained for the classical one-component plasma (OCP) at Γ=100 is presented. It enforces continuity at the simulation range in the Ornstein-Zernike direct correlation function by adding a single Yukawa correction term to an assumed long-range mean-spherical form. In addition, 1/N corrections to the Monte Carlo data are accounted for in order to obtain a satisfactory value for the OCP isothermal compressibility, as compared to the value directly obtained from the Monte Carlo equation of state. The bridge function E(r) is then extracted, and it is found to follow the hard-sphere bridge function at short range, in agreement with the universality hypothesis of Rosenfeld and Ashcroft. However, at long range there are small but nonuniversal corrections whose form is also discussed.