NONEQUILIBRIUM PHASE ORDERING WITH A GLOBAL CONSERVATION LAW

In all dimensions, infinite-range Kawasaki spin exchange in a quenched Ising model leads to an asymptotic length scale L similar to(rho t)(1 /2)similar to t(1/3) at T=0 because the kinetic coefficient is renorma lized by the broken-bond density, rho similar to L(-1). For T>0, activ ated kinetics recovers the standard asymptotic growth law, L similar t o t(1/2). However, at all temperature, infinite-range energy transport is allowed by the spin-exchange dynamics. A better implementation of global conservation, the microcanonical Creutz algorithm, is well beha ved and exhibits the standard nonconserved growth law, L similar to t( 1/2), at all temperatures.