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arXiv 0905.0376cond-mat.stat-mech
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非马尔可夫首达时间问题的路径积分方法

Path Integral Approach to non-Markovian First-Passage Time Problems

Michele Maggiore, Antonio Riotto

摘要:

计算随机过程首达时间通过给定阈值的概率是物理学许多分支中的经典问题。当随机动力学是马尔可夫的,概率承认优雅的解析解来自福克-普朗克方程的吸收边界条件,而当潜在的动力学是非马尔可夫的,方程的概率变得非本地由于记忆项的外观,和问题变得更加难以解决。我们表明,非马尔可夫过程的概率分布和首次通过时间的计算可以映射到一个边界的路径积分的评价,我们开发了一种技术,用于评估微扰这个路径积分,顺序顺序的非马尔可夫条款。

英文摘要:

The computation of the probability of the first-passage time through a given threshold of a stochastic process is a classic problem that appears in many branches of physics. When the stochastic dynamics is markovian, the probability admits elegant analytic solutions derived from the Fokker-Planck equation with an absorbing boundary condition while, when the underlying dynamics is non-markovian, the equation for the probability becomes non-local due to the appearance of memory terms, and the problem becomes much harder to solve. We show that the computation of the probability distribution and of the first-passage time for non-Markovian processes can be mapped into the evaluation of a path-integral with boundaries, and we develop a technique for evaluating perturbatively this path integral, order by order in the non-Markovian terms.

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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