Dynamics of antiferromagnetic Ising model with fixed magnetization

The dynamical critical exponent z of the Ising antiferromagnet under the constraint of a fixed zero magnetization is verified by Monte Carlo simulations to be compatible with that of the usual Glauber dynamics of model A, while for positive magnetization the exponent seems different. We also determine the diffusivity of the magnetization and finite size effects. Received: 18 June 1997 / Revised: 28 July 1997 / Accepted: 13 October 1997