title: Discretization dependence of criticality in model fluids: a hard-core electrolyte.
abstract: Grand-canonical simulations at various levels, zeta=5-20, of fine-lattice discretization are reported for the near-critical 1:1 hard-core electrolyte or restricted primitive model (RPM). With the aid of finite-size scaling analyses, it is shown convincingly that, contrary to recent suggestions, the universal critical behavior is independent of zeta (> or approximately 4), thus the continuum (zeta--> infinity ) RPM exhibits Ising-type (as against classical, self-avoiding walk, XY, etc.) criticality. A general consideration of lattice discretization provides effective extrapolation of the intrinsically erratic zeta dependence, yielding (T*(c),rho*(c)) approximately equal to (0.0493(3),0.075) for the zeta=infinity RPM.
authors.affiliation: Institute for Physical Science and Technology, University of Maryland, College Park, MD 20742, USA.
authors.forename: Young C
authors.initials: YC
authors.lastname: Kim
authors.forename: Michael E
authors.initials: ME
authors.lastname: Fisher