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arXiv 0909.0579cond-mat.stat-mech
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从细致平衡原理推导朗之万方程

Derivation of the Langevin equation from the principle of detailed balance

Jorge Berger

摘要:

对于给定温度下的系统,已知能量是一组变量的函数,通过用格子代替相空间,并引用细致平衡原理,我们得到了变量演化的热涨落。除了它的简单性,这种方法的资产是,它使我们能够获得朗之万方程时,相空间是各向异性的,当系统是通过曲线坐标描述。作为一个例子,我们将我们的结果应用到Kramer-Watts-Tobin方程的超导性。伊藤和Stratonovich程序之间的选择进行了讨论。

英文摘要:

For a system at given temperature, with energy known as a function of a set of variables, we obtain the thermal fluctuation of the evolution of the variables by replacing the phase-space with a lattice and invoking the principle of detailed balance. Besides its simplicity, the asset of this method is that it enables us to obtain the Langevin equation when the phase-space is anisotropic and when the system is described by means of curvilinear coordinates. As an illustration, we apply our results to the Kramer--Watts-Tobin equation in superconductivity. The choice between the Itô and the Stratonovich procedures is discussed.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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