Physics – Condensed Matter – Disordered Systems and Neural Networks
Scientific paper
2007-02-07
Physics
Condensed Matter
Disordered Systems and Neural Networks
AMS-LaTeX v1.2, 7 pages with 14 figures Encapsulated Postscript, to be published
Scientific paper
10.1016/j.physa.2008.06.019
We have performed computer simulations of Kauffman's automata on several graphs such as the regular square lattice and invasion percolation clusters in order to investigate phase transitions, radial distributions of the mean total damage (dynamical exponent $z$) and propagation speeds of the damage when one adds a damaging agent, nicknamed "strange man". Despite the increase in the damaging efficiency, we have not observed any appreciable change at the transition threshold to chaos neither for the short-range nor for the small-world case on the square lattices when the strange man is added in comparison to when small initial damages are inserted in the system. The propagation speed of the damage cloud until touching the border of the system in both cases obeys a power law with a critical exponent $\alpha$ that strongly depends on the lattice. Particularly, we have ckecked the damage spreading when some connections are removed on the square lattice and when one considers special invasion percolation clusters (high boundary-saturation clusters). It is seen that the propagation speed in these systems is quite sensible to the degree of dilution.
Ferraz Carlos Handrey A.
Herrmann Hans Jürgen
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