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http://hdl.handle.net/2445/18804
Title: | Symmetries and fixed point stability of stochastic differential equations modeling self-organized criticality |
Author: | Corral, Álvaro Díaz Guilera, Albert |
Keywords: | Física estadística Termodinàmica Sistemes no lineals Propietats magnètiques Equacions d'estat Regla de les fases i equilibri Transformacions de fase (Física estadística) Equacions diferencials estocàstiques Statistical physics Thermodynamics Nonlinear systems Magnetic properties Equations of state Phase rule and equilibrium Phase transformations (Statistical physics) Stochastic differential equations |
Issue Date: | 1997 |
Publisher: | The American Physical Society |
Abstract: | A stochastic nonlinear partial differential equation is constructed for two different models exhibiting self-organized criticality: the Bak-Tang-Wiesenfeld (BTW) sandpile model [Phys. Rev. Lett. 59, 381 (1987); Phys. Rev. A 38, 364 (1988)] and the Zhang model [Phys. Rev. Lett. 63, 470 (1989)]. The dynamic renormalization group (DRG) enables one to compute the critical exponents. However, the nontrivial stable fixed point of the DRG transformation is unreachable for the original parameters of the models. We introduce an alternative regularization of the step function involved in the threshold condition, which breaks the symmetry of the BTW model. Although the symmetry properties of the two models are different, it is shown that they both belong to the same universality class. In this case the DRG procedure leads to a symmetric behavior for both models, restoring the broken symmetry, and makes accessible the nontrivial fixed point. This technique could also be applied to other problems with threshold dynamics. |
Note: | Reproducció del document publicat a: http://dx.doi.org/10.1103/PhysRevE.55.2434 |
It is part of: | Physical Review E, 1997, vol. 55, núm. 3, p. 2434-2445 |
URI: | http://hdl.handle.net/2445/18804 |
Related resource: | http://dx.doi.org/10.1103/PhysRevE.55.2434 |
ISSN: | 1063-651X |
Appears in Collections: | Articles publicats en revistes (Física de la Matèria Condensada) |
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