所属单位：航空学院
发表刊物：PHYSICA A-STATISTICAL MECHANICS AND ITS APPLICATIONS
关键字：Action surface Lagrangian manifold Large fluctuations Quasi-potential
摘要：Noise-induced escape from a metastable state in an overdamped double-well system is investigated. With the WKB approximation employed, the pattern of fluctuational paths is given. By using the action plot, which gives rise to MPEPs, the pattern is divided into various regions where fluctuational paths inside show qualitatively distinguished characteristics. The global quasi-potential is calculated and its value at the saddle on the boundary agrees with the one obtained by action plot. We show a contour and 3D plot of the quasi-potential to illustrate the relative stabilities of metastable states. The bifurcations of singularities as the system parameter varies are analyzed by the second-order term of the WKB expansion in the vicinity of chi axis. Its asymptotic behavior determines the positions of cusps and furthermore, its evolution turns out to delineate the twisting structure of the Lagrangian manifold. (C) 2016 Published by Elsevier B.V.
ISSN号：0378-4371
是否译文：否
发表时间：2017-03-01
合写作者：陈朕
通讯作者：刘先斌
发表时间：2017-03-01