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arXiv 0810.0839cond-mat.stat-mech
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具有加性和乘性噪声的Fokker-Planck方程含时解析解的矩量法

A moment approach to analytic time-dependent solutions of the Fokker-Planck equation with additive and multiplicative noise

Hideo Hasegawa

摘要:

提出了一种有效的方法,作为一种近似的,解析的含时解的Fokker-Planck方程(FPE)的Langevin模型受到加性和乘性噪声。我们假定动力学概率分布函数具有与精确定常概率分布函数相同的结构,其参数用一阶矩和二阶矩表示,其运动方程由FPE确定。模型计算表明,动态分布响应于所施加的信号和我们的矩量法计算的力是在良好的协议与偏差分方程方法得到的。作为我们的方法的应用,我们提出了时间依赖的Fisher信息的反伽玛分布,这是实现在FPE只包括乘性噪声。

英文摘要:

An efficient method is presented as a means of an approximate, analytic time-dependent solution of the Fokker-Planck equation (FPE) for the Langevin model subjected to additive and multiplicative noise. We have assumed that the dynamical probability distribution function has the same structure as the exact stationary one and that its parameters are expressed in terms of first and second moments, whose equations of motion are determined by the FPE. Model calculations have shown that dynamical distributions in response to applied signal and force calculated by our moment method are in good agreement with those obtained by the partial difference equation method. As an application of our method, we present the time-dependent Fisher information for the inverse-gamma distribution which is realized in the FPE including multiplicative noise only.

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