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Stochastic Loewner evolution driven by Levy processes | I. Rushkin
; P. Oikonomou
; L. P. Kadanoff
; I. A. Gruzberg
; | Date: |
7 Sep 2005 | Subject: | Statistical Mechanics | cond-mat.stat-mech | Affiliation: | The James Franck Institute, The University of Chicago | Abstract: | Standard stochastic Loewner evolution (SLE) is driven by a continuous Brownian motion, which then produces a continuous fractal trace. If jumps are added to the driving function, the trace branches. We consider a generalized SLE driven by a superposition of a Brownian motion and a stable Levy process. The situation is defined by the usual SLE parameter, $kappa$, as well as $alpha$ which defines the shape of the stable Levy distribution. The resulting behavior is characterized by two descriptors: $p$, the probability that the trace self-intersects, and $ ilde{p}$, the probability that it will approach arbitrarily close to doing so. Using Dynkin’s formula, these descriptors are shown to change qualitatively and singularly at critical values of $kappa$ and $alpha$. It is reasonable to call such changes ``phase transitions’’. These transitions occur as $kappa$ passes through four (a well-known result) and as $alpha$ passes through one (a new result). Numerical simulations are then used to explore the associated touching and near-touching events. | Source: | arXiv, cond-mat/0509187 | Services: | Forum | Review | PDF | Favorites |
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