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arXiv 2409.02411cond-mat.stat-mech
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耦合到两个热库的活性粒子的联合概率密度

Joint probability densities of an active particle coupled to two heat reservoirs

Jae-Won Jung, Sung Kyu Seo, Kyungsik Kim

AI总结:

本文推导了耦合两个热库的活性粒子的修正Fokker-Planck方程,求解了多种拓扑的联合分布密度,发现其在短时间表现为超扩散、长时间为高斯正常扩散,并分析了峰度等非平衡特性。

摘要:

我们推导了耦合到两个热库、受谐波力、粘性力和随机力作用的活性粒子的联合概率密度的Fokker-Planck方程。求解了全连接拓扑及其他三种拓扑的联合分布密度的近似解,这些解在三个相关时间区域应用了指数相关高斯力。均方位移和速度表现为超扩散形式,而在均方位移和速度具有高斯形式时则表现为正常扩散。同时,通过矩方程近似和数值计算了峰度、相关系数和矩。在本文中,我们推导了耦合到两个热库、受谐波力、粘性力和随机力作用的活性粒子的修正Fokker-Planck方程。我们获得了包括中心拓扑、环拓扑和链拓扑在内的拓扑的联合分布密度解,这些解受指数相关高斯力作用。均方位移和均方速度在短时间区域和特征时间=0时表现为超扩散,而在长时间区域和特征时间=0时具有高斯形式。我们同时计算并分析了由推导的矩方程得到的峰度、相关系数和矩的非平衡特性。

英文摘要:

We derive a Fokker-Planck equation for joint probability density for an active particle coupled two heat reservoirs with harmonic, viscous, random forces. The approximate solution for the joint distribution density of all-to-all and three others topologies is solved, which apply an exponential correlated Gaussian force in three-time regions of correlation time. Mean squared displacement, velocity behaviors in the form of super-diffusion, while the mean squared displacement, velocity has the Gaussian form, normal diffusion. Concomitantly, the Kurtosis, correlation coefficient, and moment from moment equation are approximately and numerically calculated. In this paper, we derive an altered Fokker-Planck equation for an active particle with the harmonic, viscous, and random forces, coupled to two heat reservoirs. We attain the solution for the joint distribution density of our topology, including the center topology, the ring topology, and the chain topology, subject to an exponential correlated Gaussian force. The mean squared displacement and the mean squared velocity behavior as the super-diffusions in the short-time domain and for the characteristic time=0, while those have the Gaussian forms in the long-time domain and for the characteristic time=0. We concomitantly calculate and analyze the non-equilibrium characteristics of the kurtosis, the correlation coefficient, and the moment from the derived moment equation.

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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