arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0908.3292cond-mat.stat-mech
收藏

高斯色噪声下亚稳态的稳定性测度

Stability measures in metastable states with Gaussian colored noise

Alessandro Fiasconaro, Bernardo Spagnolo

摘要:

研究了在Ornstein-Uhlenbeck过程产生的色噪声作用下过阻尼布朗粒子从亚稳态的逃逸时间。我们分析了相关时间的作用,通过势垒的平均第一通过时间的增强和作为噪声强度的函数的平均增长率系数的行为。我们观察到的噪声增强的稳定性效果的所有初始不稳定状态,并为所有的相关时间值$τ_c$调查。根据$τ_c$相对于系统弛豫时间的值,我们可以区分两种动力学区域,其特征在于分别为弱相关噪声和强相关噪声。

英文摘要:

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 $τ_c$ investigated. We can distinguish two dynamical regimes characterized by weak and strong correlated noise respectively, depending on the value of $τ_c$ with respect to the relaxation time of the system.

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。

↑