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arXiv 1707.00767cond-mat.stat-mech
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通过轨迹的伞形抽样的生长过程的罕见行为

Rare behavior of growth processes via umbrella sampling of trajectories

Katherine Klymko, Phillip L. Geissler, Juan P. Garrahan, Stephen Whitelam

摘要:

我们计算了可逆和不可逆增长过程的轨道观测值的概率分布。这些结果揭示了可逆和不可逆过程之间的对应关系,在参数空间中的特定点,在其典型和非典型的轨迹。因此,生长过程的关键特征可能对用于产生它们的速率常数的精确形式不敏感,这让人回想起对某些平衡行为的微观细节的不敏感。我们得到了这些结果使用的采样方法,灵感来自于“S-合奏”大偏差形式主义,这相当于伞采样轨迹空间。该方法是现有方法的一个简单变体,适用于由事件总数控制的轨迹集合。它可以用来确定大偏差率函数的轨迹观测或平衡。

英文摘要:

We compute probability distributions of trajectory observables for reversible and irreversible growth processes. These results reveal a correspondence between reversible and irreversible processes, at particular points in parameter space, in terms of their typical and atypical trajectories. Thus key features of growth processes can be insensitive to the precise form of the rate constants used to generate them, recalling the insensitivity to microscopic details of certain equilibrium behavior. We obtained these results using a sampling method, inspired by the "s-ensemble" large-deviation formalism, that amounts to umbrella sampling in trajectory space. The method is a simple variant of existing approaches, and applies to ensembles of trajectories controlled by the total number of events. It can be used to determine large-deviation rate functions for trajectory observables in or out of equilibrium.

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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