CRITICAL-POINT OF THE LENNARD-JONES FLUID - A FINITE-SIZE-SCALING STUDY

Monte Carlo simulations of the full, i.e. nontruncated, 3d Lennard-Jon es fluid in the critical region are reported. The simulations are perf ormed within the grand canonical ensemble in conjunction with hypersph erical boundary conditions in order to take account of the algebraic a ttractive part of the pair potential. Using mixed-field finite size sc aling analysis and with the assumption of Ising criticality the critic al temperature is estimated to be T=1.326+/-0.002 and the critical de nsity rho=0.316+/-0.002. Precised estimates of the critical energy pe r unit volume, pressure, chemical potential, and mixed-field parameter s are also reported. The values obtained for the renormalization expon ents y(tau) and y(h) are compatible with the 3d Ising values within th e error bars. (C) 1998 American Institute of Physics.