Phase ordering in chaotic map lattices with conserved dynamics

Dynamical scaling in a two-dimensional lattice model of chaotic maps, in co ntact with a thermal bath at temperature T, is numerically studied. The mod el here proposed is equivalent to a conserved Ising model with couplings th at fluctuate over the same time scale as spin moves. When coupling fluctuat ions and thermal fluctuations are both important, this model does not belon g to the class of universality of a Langevin equation known as model B; the scaring exponents are continuously varying with T and depend on the map us ed. The universal behavior of model B is recovered when thermal fluctuation s are dominant. [S1063-651X(99)50711-3].