On Conservative and Monotone One-dimensional Cellular Automata and Their Particle Representation

Details On Conservative and Monotone One-dimensional Cellular Automata and Their Particle Representation On Conservative and Monotone One-dimensional Cellular Automata and Their Particle Representation

2003-06-19

arxiv.org/abs/nlin/0306040v2

Nonlinear Sciences

Cellular Automata and Lattice Gases

38 pages, 2 figures. To appear in Theo. Comp. Sc. Several changes throughout the text; major change in section 4.2

Scientific paper

Number-conserving (or {\em conservative}) cellular automata have been used in several contexts, in particular traffic models, where it is natural to think about them as systems of interacting particles. In this article we consider several issues concerning one-dimensional cellular automata which are conservative, monotone (specially ``non-increasing''), or that allow a weaker kind of conservative dynamics. We introduce a formalism of ``particle automata'', and discuss several properties that they may exhibit, some of which, like anticipation and momentum preservation, happen to be intrinsic to the conservative CA they represent. For monotone CA we give a characterization, and then show that they too are equivalent to the corresponding class of particle automata. Finally, we show how to determine, for a given CA and a given integer $b$, whether its states admit a $b$-neighborhood-dependent relabelling whose sum is conserved by the CA iteration; this can be used to uncover conservative principles and particle-like behavior underlying the dynamics of some CA. Complements at {\tt http://www.dim.uchile.cl/\verb' 'anmoreir/ncca}

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