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arXiv 2107.02148cond-mat.stat-mech
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重置条件下含扩散粒子的随机门控目标搜索

Search of stochastically gated targets with diffusive particles under resetting

Gabriel Mercado-Vásquez, Denis Boyer

摘要:

研究了泊松定速率重置$r$对布朗粒子与随机门控靶反应时间的影响。目标在反应状态和非反应状态之间切换。我们计算的平均时间,在该粒子的重置受到第一次击中目标,而后者是在反应状态。搜索时间在取决于目标转换速率的复位速率下最小。当目标弛豫速率远大于重置速率和逆扩散时间时,系统等价于部分吸收边界问题。然而,在其他情况下,最佳重置率可能是目标率的非单调函数,这是在部分吸收中观察不到的特征。我们计算的第一次击中时间的平均值周围的相对波动,并比较我们的结果与ungated的情况下。由于目标内部动态,这些波动在最佳状态下重置过程的通常普遍行为被打破。

英文摘要:

The effects of Poissonian resetting at a constant rate $r$ on the reaction time between a Brownian particle and a stochastically gated target are studied. The target switches between a reactive state and a non-reactive one. We calculate the mean time at which the particle subject to resetting hits the target for the first time, while the latter is in the reactive state. The search time is minimum at a resetting rate that depends on the target transition rates. When the target relaxation rate is much larger than both the resetting rate and the inverse diffusion time, the system becomes equivalent to a partially absorbing boundary problem. In other cases, however, the optimal resetting rate can be a non-monotonic function of the target rates, a feature not observed in partial absorption. We compute the relative fluctuations of the first hitting time around its mean and compare our results with the ungated case. The usual universal behavior of these fluctuations for resetting processes at their optimum breaks down due to the target internal dynamics.

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