CLUSTER DYNAMICS AND UNIVERSALITY OF ISING LATTICE GASES

Lattice gases with nearest-neighbour exclusion are studied by means of Monte Carlo simulations with an efficient cluster algorithm. The crit ical dynamics is consistent with a dynamical exponent z = 0 in the cas e of Wolff-like cluster updates for square and simple-cubic lattices i n the studied range of lattice sizes. We find the critical activity z( c) = 0.72020(4) for the body-centred cubic lattice. The critical expon ents y(h) = 2.475(8) and y(t) = 1.61(6) disagree with an earlier study , but they do agree with the known values for the three-dimensional Is ing universality class. (C) 1998 Elsevier Science B.V. All rights rese rved.