Fiasconaro Alessandro, Spagnolo Bernardo
Dipartimento di Fisica e Tecnologie Relative, Group of Interdisciplinary Physics, Università di Palermo and CNISM-INFM, Viale delle Scienze, I-90128 Palermo, Italy.
Phys Rev E Stat Nonlin Soft Matter Phys. 2009 Oct;80(4 Pt 1):041110. doi: 10.1103/PhysRevE.80.041110. Epub 2009 Oct 7.
We present a study of the escape time from a metastable state of an overdamped Brownian particle in the presence of colored noise generated by Ornstein-Uhlenbeck process. We analyze the role of the correlation time on the enhancement of the mean first passage time through a potential barrier and on the behavior of the mean growth rate coefficient as a function of the noise intensity. We observe the noise-enhanced stability effect for all the initial unstable states used and for all values of the correlation time tau(c) investigated. We can distinguish two dynamical regimes characterized by weak and strong correlated noises, depending on the value of tau(c) with respect to the relaxation time of the system.
我们给出了一项关于在存在由奥恩斯坦 - 乌伦贝克过程产生的有色噪声情况下，过阻尼布朗粒子从亚稳态逃逸时间的研究。我们分析了相关时间对通过势垒的平均首次通过时间增强的作用，以及平均增长率系数随噪声强度变化的行为。对于所有使用的初始不稳定状态以及所研究的相关时间(\tau_c)的所有值，我们都观察到了噪声增强稳定性效应。根据(\tau_c)相对于系统弛豫时间的值，我们可以区分出以弱相关噪声和强相关噪声为特征的两种动力学 regime。
