RT Journal Article T1 Lattice gases in slab geometries A1 Ernst, M. H. A1 Brito López, Ricardo AB Non-mean-field-type excess correlations at short times are present in three-dimensional (3D) computer simulations of the velocity autocorrelation function, but absent in 1D, 2D, and 4D. They are caused by ring collisions in a quasi-3D slab of size 2 x L x L x L in a face-centered-hypercubic lattice with periodic boundary conditions, which is the only available lattice-gas cellular automaton with 3D isotropic fluid flow. We evaluate this excess correlation. The simulation data agree very well with our exact result. PB American Physical Society SN 1050-2947 YR 1991 FD 1991-12-15 LK https://hdl.handle.net/20.500.14352/58633 UL https://hdl.handle.net/20.500.14352/58633 LA eng NO ©1991 The American Physical Society. It is a pleasure to thank J. W. Dufty, D. Frenkel, and M. van der Hoef for many stimulating and clarifying discussions, and in particular D.F. and M.v. d.H. for providing us with some unpublished simulation data. R.B. acknowledges support from a DGICYT Project No. PB88-0140 and M.H. E. from a NATO Collaborative Research Grant. NO DGICYT NO NATO Collaborative Research Grant DS Docta Complutense RD 10 abr 2025