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arXiv 2408.04726cond-mat.stat-mechmath-phmath.MP
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异质环境中带重置的随机搜索

Random search with resetting in heterogeneous environments

Luiz Menon, Celia Anteneodo

AI总结:

本文研究空间依赖扩散率下带随机重置的一维搜索,给出平均首次通过时间的精确或渐近结果,并揭示异质性对重置效果的影响。

摘要:

我们研究在有界一维环境中、以速率 r 进行随机位置重置的随机搜索,其中扩散率 D(x) 依赖于空间位置。对于任意形状的 D(x) 以及相关乘性随机过程的不同规定,我们得到了在给定初始位置和重置位置时到达目标的平均时间 T(平均首次通过时间)的解析表达式,并与随机模拟结果高度吻合。对于任意 D(x),我们在 Stratonovich 情形下得到了 T 的精确闭式表达式;而对于 Itô 和 anti-Itô 等其他规定,我们推导了小速率 r 和大速率 r 下的渐近近似。对于线性等特定形式的 D(x),我们还在任意规定下获得了精确结果,从而能够概述并讨论扩散异质性对带重置随机搜索引入的主要效应。我们探究了重置的有效性如何随不同类型的异质性而变化。

英文摘要:

We investigate random searches under stochastic position resetting at rate $r$, in a bounded 1D environment with space-dependent diffusivity $D(x)$. For arbitrary shapes of $D(x)$ and prescriptions of the associated multiplicative stochastic process, we obtain analytical expressions for the average time $T$ for reaching the target (mean first-passage time), given the initial and reset positions, in good agreement with stochastic simulations. For arbitrary $D(x)$, we obtain an exact closed-form expression for $T$, within Stratonovich scenario, while for other prescriptions, like Itô and anti-Itô, we derive asymptotic approximations for small and large rates $r$. Exact results are also obtained for particular forms of $D(x)$, such as the linear one, with arbitrary prescriptions, allowing to outline and discuss the main effects introduced by diffusive heterogeneity on a random search with resetting. We explore how the effectiveness of resetting varies with different types of heterogeneity.

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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