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arXiv 2402.16673cond-mat.stat-mechcond-mat.mes-hallcond-mat.soft
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非马尔可夫系统中记忆的有效质量方法

Effective mass approach to memory in non-Markovian systems

M. Wiśniewski, J. Łuczka, J. Spiechowicz

AI总结:

本文提出用有效质量方法近似非马尔可夫系统,通过仅由记忆核决定的有效质量在无记忆朗之万方程中复现记忆效应,为研究马尔可夫动力学的记忆修正奠定基础。

摘要:

近期针对非马尔可夫动力学开展的开创性实验(例如在活性物质中)表明,我们对这一具有挑战性但又十分热门的课题的理论理解仍相当不完整,仍有大量现象等待发现。这与以下事实有关:通常为了简化而采用马尔可夫近似,结果记忆被忽略。因此,能够研究记忆效应的方法极具价值。我们证明,由质量为 $M$ 的布朗粒子的广义朗之万方程(GLE)所描述的非马尔可夫系统,可以用无记忆的朗之万方程来近似,其中记忆效应仅通过布朗粒子的有效质量 $M^*$ 即可被正确复现,而 $M^*$ 仅由记忆核的形式决定。我们的工作为一种具有重要影响的方法奠定了基础,该方法可用于方便地研究对马尔可夫动力学的记忆相关修正。

英文摘要:

Recent pioneering experiments on non-Markovian dynamics done e.g. for active matter have demonstrated that our theoretical understanding of this challenging yet hot topic is rather incomplete and there is a wealth of phenomena still awaiting discovery. It is related to the fact that typically for simplification the Markovian approximation is employed and as a consequence the memory is neglected. Therefore methods allowing to study memory effects are extremely valuable. We demonstrate that a non-Markovian system described by the Generalized Langevin Equation (GLE) for a Brownian particle of mass $M$ can be approximated by the memoryless Langevin equation in which the memory effects are correctly reproduced solely via the effective mass $M^*$ of the Brownian particle which is determined only by the form of the memory kernel. Our work lays the foundation for an impactful approach which allows to readily study memory-related corrections to Markovian dynamics.

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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