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arXiv 0905.0089cond-mat.stat-mech
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平均场旋节线附近弛豫时间的标度性质

Scaling properties of the relaxation time near the mean-field spinodal

Takashi Mori, Seiji Miyashita, Per Arne Rikvold

摘要:

研究了无限长程相互作用模型(Husimi-Temperley模型)在旋节点附近的弛豫过程。我们提出了一个统一的有限尺寸标度函数,包括亚稳区,亚稳点和不稳定区。我们明确地采用了格劳伯动力学,推导出总磁化强度的概率分布的主方程,并执行所谓的van Kampen Omega展开(系统大小的倒数的展开),这导致了福克-普朗克方程。我们分析了Fokker-Planck方程的标度性质,并通过直接数值求解原主方程和随机衰变过程的动力学蒙特卡罗模拟证实了所得到的标度图。

英文摘要:

We study the relaxation processes of the infinitely long-range interaction model (the Husimi-Temperley model) near the spinodal point. We propose a unified finite-size scaling function near the spinodal point, including the metastable region, the spinodal point, and the unstable region. We explicitly adopt the Glauber dynamics, derive a master equation for the probability distribution of the total magnetization, and perform the so-called van Kampen Omega expansion (an expansion in terms of the inverse of the systems size), which leads to a Fokker-Planck equation. We analyze the scaling properties of the Fokker-Planck equation and confirm the obtained scaling plot by direct numerical solution of the original master equation, and by kinetic Monte Carlo simulation of the stochastic decay process.

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