arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2203.12947cond-mat.stat-mech
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跃迁路径系综的扩散系数依赖性

Diffusivity dependence of the transition path ensemble

Lukas Kikuchi, Ronojoy Adhikari, Julian Kappler

摘要:

随机动力系统的跃迁路径通常用瞬子来近似。在这里,我们表明,使用包含两个竞争途径的动力学系统,在低到中等温度下,瞬子可能无法捕获最有可能的过渡途径。我们构建了一个近似,其中包括周围的瞬子的波动,并通过与一个准确的和有效的路径空间蒙特卡罗采样方法的结果进行比较,发现这种近似在很宽的温度范围内。我们的工作界定了大偏差理论的适用性,并提供了方法来探测这些限制数值。

英文摘要:

Transition pathways of stochastic dynamical systems are typically approximated by instantons. Here we show, using a dynamical system containing two competing pathways, that at low-to-intermediate temperatures, instantons can fail to capture the most likely transition pathways. We construct an approximation which includes fluctuations around the instanton and, by comparing with the results of an accurate and efficient path-space Monte Carlo sampling method, find this approximation to hold for a wide range of temperatures. Our work delimits the applicability of large deviation theory and provides methods to probe these limits numerically.

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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