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arXiv 0907.3934cond-mat.stat-mech
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KPZ及其动力学方程的变分形式

Variational Formulation for the KPZ and Related Kinetic Equations

Horacio S. Wio

摘要:

我们提出了一个变分制定的Kardar-Parisi-Zhang(KPZ)方程,导致一个类似的潜在的KPZ以及其他相关的动力学方程。对于KPZ的情况下,与这样的潜在的知识,我们证明了一些全球性的平移不变性的性质,以前由其他作者。我们还展示了几个结果的形式的平稳概率分布函数的任意尺寸。用于KPZ的程序进行了扩展,以获得更一般的形式,这样的功能导致其他非线性动力学方程,以及密度依赖的表面张力的情况下。

英文摘要:

We present a variational formulation for the Kardar-Parisi-Zhang (KPZ) equation that leads to a thermodynamic-like potential for the KPZ as well as for other related kinetic equations. For the KPZ case, with the knowledge of such a potential we prove some global shift invariance properties previously conjectured by other authors. We also show a few results about the form of the stationary probability distribution function for arbitrary dimensions. The procedure used for KPZ was extended in order to derive more general forms of such a functional leading to other nonlinear kinetic equations, as well as cases with density dependent surface tension.

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