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arXiv 2603.05074cond-mat.stat-mech
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具有旋转惯量的活性布朗粒子的福克-普朗克描述

Fokker-Planck description of an active Brownian particle with rotational inertia

Wenzhou University(温州大学);University of Chinese Academy of Sciences(中国科学院大学)

Lingyi Wang, Ziluo Zhang, Zhongqiang Xiong, Zhanglin Hou, Linli He, Shigeyuki Komura

AI总结:

本文提出了一种基于福克-普朗克方程的微扰方法,用于计算具有有限转动惯量的活性布朗粒子的均方位移,并通过数值模拟验证了分析结果。

摘要:

我们开发了一个微扰框架,用于计算具有有限转动惯量的活性布朗粒子(ABPs)的均方位移(MSD)。从相应的福克-普朗克方程出发,我们对空间坐标进行傅里叶变换,并利用埃尔米特多项式作为角速度的本征函数,这使得可以系统地对MSD进行逐阶微扰展开。通过在拉普拉斯空间中重新求和所得到的级数并进行反变换,我们得到了MSD作为转动惯量函数的显式表达式。分析结果进一步通过与数值模拟的比较进行验证。

英文摘要:

We develop a perturbative framework to calculate the mean-squared displacement (MSD) of active Brownian particles (ABPs) with a finite moment of inertia. Starting from the corresponding Fokker-Planck equation, we employ a Fourier transform for the spatial coordinates and Hermite polynomials as eigenfunctions for the angular velocity, which enables a systematic perturbative expansion of the MSD order by order. By resumming the resulting series in Laplace space and performing the inverse transform, we obtain an explicit expression for the MSD as a function of the moment of inertia. The analytical results are further validated by comparison with numerical simulations.

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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