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arXiv 1912.00514cond-mat.stat-mech
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双稳态势中的态相关扩散:条件概率和逃逸率

State dependent diffusion in a bistable potential: conditional probabilities and escape rates

Miguel V. Moreno, Daniel G. Barci, Zochil González Arenas

摘要:

本文考虑一个简单的双稳态系统在乘性噪声影响下的模型。我们提供了一个路径积分表示的过阻尼朗之万动力学和计算条件概率和逃逸率在弱噪声近似。泛函积分的鞍点解由稀释的瞬子和反瞬子气体给出,类似于加性噪声问题。然而,在这种情况下,波动上的积分更复杂。我们引入了一个本地时间重新参数化,使其计算的形式通常的高斯积分。我们发现修正的Kramers'逃逸率产生的扩散函数,它管理的状态依赖的扩散的随机处方参数的任意值。通过数值模拟验证了理论结果。

英文摘要:

We consider a simple model of a bistable system under the influence of multiplicative noise. We provide a path integral representation of the overdamped Langevin dynamics and compute conditional probabilities and escape rates in the weak noise approximation. The saddle-point solution of the functional integral is given by a diluted gas of instantons and anti-instantons, similarly to the additive noise problem. However, in this case, the integration over fluctuations is more involved. We introduce a local time reparametrization that allows its computation in the form of usual Gaussian integrals. We found corrections to the Kramers' escape rate produced by the diffusion function which governs the state dependent diffusion for arbitrary values of the stochastic prescription parameter. Theoretical results are confirmed through numerical simulations.

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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