非马尔可夫性提高跃迁路径概率
Non-Markovianity increases transition path probability
AI总结:
研究揭示非马尔可夫记忆效应会使跃迁路径概率随记忆时间非单调变化并超过1/2,从而否定其作为反应坐标质量判据的有效性。
摘要:
定义低维反应坐标对于分析复杂系统动力学以及与实验比较至关重要。沿反应坐标 $x$ 的跃迁路径概率 $p(\mathrm{TP}|x)$ 的最大值,常通过与过阻尼马尔可夫极限下的理论最大值 1/2 进行比较,作为评估反应坐标质量的常用估计量。我们通过解析论证和模拟表明,对于非马尔可夫动力学,$p(\mathrm{TP}|x)$ 作为记忆时间的函数是非单调的,并在长记忆时间时超过 1/2。这使得 $p(\mathrm{TP}|x)$ 不再适合作为反应坐标质量的判据。
英文摘要:
Defining low-dimensional reaction coordinates is crucial for analyzing the dynamics of complex systems and for comparison with experiments. The maximal value of the transition-path probability along the reaction coordinate $x$, $p(\mathrm{TP}|x)$, is a common estimator for reaction-coordinate quality by comparing to the theoretical maximal value of 1/2 in the overdamped Markovian limit. We show by analytical arguments and simulations that for non-Markovian dynamics $p(\mathrm{TP}|x)$ is non-monotonic as a function of the memory time and exceeds 1/2 for long memory time. This disqualifies $p(\mathrm{TP}|x)$ as a criterion for reaction coordinate quality.
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