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arXiv 0711.1895nlin.PS
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离散晶格中孤立波形成的动力学势垒

Dynamical Barrier for the Formation of Solitary Waves in Discrete Lattices

P. G. Kevrekidis, J. A. Espinola-Rocha, Y. Drossinos, A. Stefanov

摘要:

我们考虑的问题的存在的动态障碍的“质量”,需要被激发的晶格网站上,导致形成和随后的持久性的本地化模式的非线性薛定谔晶格。我们对比的存在与它的情况下,在静态理论的局域化模式在一个空间维度的动态障碍。我们提出了一个充满活力的标准,提供了一个充分的,但不是必要的,条件的振幅所需的单站点的初始条件,形成一个孤立波。我们表明,这种效果是不是一维的,通过考虑其二维模拟。在不可积的,离散的,非线性薛定谔方程的局部模式的激发的充分条件的存在相比,在可积的,离散和连续的,版本的非线性薛定谔方程的激发的动力学。

英文摘要:

We consider the problem of the existence of a dynamical barrier of ``mass'' that needs to be excited on a lattice site to lead to the formation and subsequent persistence of localized modes for a nonlinear Schrodinger lattice. We contrast the existence of a dynamical barrier with its absence in the static theory of localized modes in one spatial dimension. We suggest an energetic criterion that provides a sufficient, but not necessary, condition on the amplitude of a single-site initial condition required to form a solitary wave. We show that this effect is not one-dimensional by considering its two-dimensional analog. The existence of a sufficient condition for the excitation of localized modes in the non-integrable, discrete, nonlinear Schrodinger equation is compared to the dynamics of excitations in the integrable, both discrete and continuum, version of the nonlinear Schrodinger equation.

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