Comment on ``Phase ordering in chaotic map lattices with conserved dynamics''

Details Comment on ``Phase ordering in chaotic map lattices with conserved dynamics'' Comment on ``Phase ordering in chaotic map lattices with conserved dynamics''

2000-04-26

arxiv.org/abs/cond-mat/0004431v1

Physics

Condensed Matter

3 pages, to be published in Phys. Rev. E

Scientific paper

10.1103/PhysRevE.62.3004

Angelini, Pellicoro, and Stramaglia [Phys. Rev. E {\bf 60}, R5021 (1999), cond-mat/9907149] (APS) claim that the phase ordering of two-dimensional systems of sequentially-updated chaotic maps with conserved ``order parameter'' does not belong, for large regions of parameter space, to the expected universality class. We show here that these results are due to a slow crossover and that a careful treatment of the data yields normal dynamical scaling. Moreover, we construct better models, i.e. synchronously-updated coupled map lattices, which are exempt from these crossover effects, and allow for the first precise estimates of persistence exponents in this case.

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