Dynamical properties of the Zhang model of Self-Organized Criticality

Details Dynamical properties of the Zhang model of Self-Organized Criticality Dynamical properties of the Zhang model of Self-Organized Criticality

1998-04-09

arxiv.org/abs/cond-mat/9804120v1

Physics

Condensed Matter

Statistical Mechanics

8 pages, 12 PostScript figures, RevTeX

Scientific paper

10.1103/PhysRevE.58.247

Critical exponents of the infinitely slowly driven Zhang model of self-organized criticality are computed for $d=2,3$ with particular emphasis devoted to the various roughening exponents. Besides confirming recent estimates of some exponents, new quantities are monitored and their critical exponents computed. Among other results, it is shown that the three dimensional exponents do not coincide with the Bak, Tang, and Wiesenfeld (abelian) model and that the dynamical exponent as computed from the correlation length and from the roughness of the energy profile do not necessarily coincide as it is usually implicitly assumed. An explanation for this is provided. The possibility of comparing these results with those obtained from Renormalization Group arguments is also briefly addressed.

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