论文标题
不对称随机重置:建模灾难性事件
Asymmetric Stochastic Resetting: Modeling Catastrophic Events
论文作者
论文摘要
在经典的随机重置问题中,根据某些随机动力学移动的粒子经历了随机中断,将其带入选定的域,然后将过程推荐。迄今为止,已将重置机构作为对称重置引入了有关首选位置的对称重置。但是,在自然界中,在几种情况下,系统只能从某些方向重置灾难性事件。在此激励的情况下,我们考虑了积极的真实线路上的连续随机过程。该过程在以恒定速率发生的随机时间中断,然后,前者仅在当前一个值超过阈值时才能重新定位为一个值。否则,它遵循由基础过程定义的轨迹而无需重置。我们提出了一个通用框架,以获得系统的确切非平衡稳态,并为系统达到原点的平均第一个传递时间。使用此框架,我们为两个不同的模型系统获得了明确的解决方案。在对称重置中发现的一些经典结果,例如最佳重置的存在,经过深刻的修改。最后,已经进行了数值模拟以验证分析结果,显示出了极好的一致性。
In the classical stochastic resetting problem, a particle, moving according to some stochastic dynamics, undergoes random interruptions that bring it to a selected domain, and then, the process recommences. Hitherto, the resetting mechanism has been introduced as a symmetric reset about the preferred location. However, in nature, there are several instances where a system can only reset from certain directions, e.g., catastrophic events. Motivated by this, we consider a continuous stochastic process on the positive real line. The process is interrupted at random times occurring at a constant rate, and then, the former relocates to a value only if the current one exceeds a threshold; otherwise, it follows the trajectory defined by the underlying process without resetting. We present a general framework to obtain the exact non-equilibrium steady state of the system and the mean first passage time for the system to reach the origin. Employing this framework, we obtain the explicit solutions for two different model systems. Some of the classical results found in symmetric resetting such as the existence of an optimal resetting, are strongly modified. Finally, numerical simulations have been performed to verify the analytical findings, showing an excellent agreement.