arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0709.1829cond-mat.stat-mechq-bio.QM
收藏

非线性平均场Fokker-Planck方程应用于生物种群的趋化性

Nonlinear mean field Fokker-Planck equations. Application to the chemotaxis of biological populations

Pierre-Henri Chavanis

摘要:

本文研究了一类非线性平均场Fokker-Planck方程的有效广义解析形式。这些方程描述了细菌群体的趋化性,正则系综中的玻色-爱因斯坦凝聚,多孔介质,广义Cahn-Hilliard方程,Kuramoto模型,BMF模型,Burgers方程,自引力布朗粒子的Smoluchowski-Poisson系统,Debye-Huckel电解质理论,二维湍流,等物理系统.特别是,我们表明,非线性平均场Fokker-Planck方程可以提供广义Keller-Segel模型描述的生物种群的趋化性。作为一个例子,我们介绍了一个新的模型结合了反常扩散和排斥原理(体积填充)的影响的趋化性。因此,广义热力学的概念可以应用于具体的物理系统。我们还考虑了相空间中的非线性平均场Fokker-Planck方程,并在强摩擦极限下给出了从广义Kramers方程到广义Smoluchowski方程的通道。我们的形式主义是简单的,并说明了相应的玻尔兹曼,Tsallis和费米-狄拉克熵等几个明确的例子。

英文摘要:

We study a general class of nonlinear mean field Fokker-Planck equations in relation with an effective generalized thermodynamical formalism. We show that these equations describe several physical systems such as: chemotaxis of bacterial populations, Bose-Einstein condensation in the canonical ensemble, porous media, generalized Cahn-Hilliard equations, Kuramoto model, BMF model, Burgers equation, Smoluchowski-Poisson system for self-gravitating Brownian particles, Debye-Huckel theory of electrolytes, two-dimensional turbulence... In particular, we show that nonlinear mean field Fokker-Planck equations can provide generalized Keller-Segel models describing the chemotaxis of biological populations. As an example, we introduce a new model of chemotaxis incorporating both effects of anomalous diffusion and exclusion principle (volume filling). Therefore, the notion of generalized thermodynamics can have applications for concrete physical systems. We also consider nonlinear mean field Fokker-Planck equations in phase space and show the passage from the generalized Kramers equation to the generalized Smoluchowski equation in a strong friction limit. Our formalism is simple and illustrated by several explicit examples corresponding to Boltzmann, Tsallis and Fermi-Dirac entropies among others.

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。

↑