Short-time scaling in the critical dynamics of an antiferromagnetic Ising system with conserved magnetization

We study by Monte Carlo simulation the short-time exponent B in an antiferromagnetic Ising system for which the magnetization is conserved but the sublattice magnetization (which is the order parameter in this case) is not. This system belongs to the dynamic class of model C. We use nearest-neighbour Kawasaki dynamics so that the magnetization is conserved locally. We find that in three dimensions A is independent of the conserved magnetization. This is in agreement with the available theoretical studies, but in disagreement with previous simulation studies with a global conservation algorithm. However, we agree with both these studies regarding the result theta(C) not equal theta(A). We also find that in two dimensions, theta(C) = theta(A).