Journal of Statistical Physics, Vol. 71, Nos. 3/4, 1993. p. 653-682.
We have investigated a lattice gas model consisting of repulsive particles following deterministic dynamics. Two versions of the model are studied. In one case we consider a finite open system in which particles can leave and enter the lattice over the edge. In the other case we use periodic boundary conditions. In both cases the density fluctuations exhibit a l/f power spectrum. The individual particles behave asymptotically like ordinary random walkers. The collective behavior of these particles shows that due to the deterministic dynamics the particles behave as if they are correlated in time. We have numerically investigated the power spectrum of the density fluctuations, the lifetime distribution, and the spatial correlation function. We discuss the appropriate Langevin-like diffusion equation which can reproduce our numerical findings. Our conclusion is that the deterministic lattice gases are described by a diffusion equation without any bulk noise...