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arXiv 0908.1275cond-mat.stat-mech
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非临界渗流团簇的Loewner驱动函数

Loewner driving functions for off-critical percolation clusters

Yoichiro Kondo, Namiko Mitarai, Hiizu Nakanishi

摘要:

本文数值研究了三角格子上的格点渗流集团边界的Loewner驱动函数U_t(p<p_c)。结果表明,U_t是一个漂移的随机游动,具有有限的交叉时间.在此时间内,平均驱动函数< U_t>表现出超扩散涨落的标度行为-(p_c-p)t^{(v +1)/2 v},而在此时间之后,驱动函数U_t经历Hurst指数为1/2的正常扩散,但漂移速度与(p_c-p)^v成正比,其中v = 4/3是二维渗流相关长度的临界指数。交叉时间发散为(p_c-p)^{-2ν},即p \to p_c。

英文摘要:

We numerically study the Loewner driving function U_t of a site percolation cluster boundary on the triangular lattice for p<p_c. It is found that U_t shows a drifted random walk with a finite crossover time. Within this crossover time, the averaged driving function < U_t> shows a scaling behavior -(p_c-p) t^{(ν+1)/2ν} with a superdiffusive fluctuation whereas, beyond the crossover time, the driving function U_t undergoes a normal diffusion with Hurst exponent 1/2 but with the drift velocity proportional to (p_c-p)^ν, where ν= 4/3 is the critical exponent for two-dimensional percolation correlation length. The crossover time diverges as (p_c-p)^{-2ν} as p\to p_c.

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