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arXiv 1711.03330nlin.PS
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哈密顿格点中孤立波行波的能量稳定性判据

An energy-based stability criterion for solitary traveling waves in Hamiltonian lattices

Haitao Xu, Jesús Cuevas--Maraver, Panayotis G. Kevrekidis, Anna Vainchtein

摘要:

在这项工作中,我们重新审视了一个标准,最初提出的[非线性{ \bf 17},207(2004)],孤立行波的稳定性在哈密顿,无限维晶格动力系统。我们讨论了这个标准的影响,从稳定性理论的角度来看,无论是在水平的谱分析的前进-延迟微分方程的共同旅行的框架,以及在Floquet问题时所产生的考虑作为一个周期性的轨道模的行波移动。我们建立了这些观点的相关特征值和Floquet乘数的对应关系,并提供了明确的表达式,其依赖于在临界点附近的行波的速度。数值结果被用来证实在两个不同的模式,其中的稳定性可能会发生两次变化的相关预测。一些扩展,概括和未来的研究方向进行了讨论。

英文摘要:

In this work, we revisit a criterion, originally proposed in [Nonlinearity {\bf 17}, 207 (2004)], for the stability of solitary traveling waves in Hamiltonian, infinite-dimensional lattice dynamical systems. We discuss the implications of this criterion from the point of view of stability theory, both at the level of the spectral analysis of the advance-delay differential equations in the co-traveling frame, as well as at that of the Floquet problem arising when considering the traveling wave as a periodic orbit modulo a shift. We establish the correspondence of these perspectives for the pertinent eigenvalue and Floquet multiplier and provide explicit expressions for their dependence on the velocity of the traveling wave in the vicinity of the critical point. Numerical results are used to corroborate the relevant predictions in two different models, where the stability may change twice. Some extensions, generalizations and future directions of this investigation are also discussed.

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