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arXiv 0901.3480nlin.PSnlin.CD
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离散非线性格点中的极端事件

Extreme events in discrete nonlinear lattices

A. Maluckov, Lj. Hadzievski, N. Lazarides, G. P. Tsironis

摘要:

我们进行统计分析的背景下,通过调制不稳定性的Salerno模型,插值之间的可积的Ablowitz-Ladik(AL)方程和不可积的离散非线性薛定谔(DNLS)方程产生的离散非线性波。我们专注于极端事件的离散流氓或怪胎波的形式,可能会出现作为一个结果的离散呼吸或其他非线性相互作用过程的快速合并。我们发现幂律依赖于波的振幅分布伴随着一个增强的概率怪胎事件接近方程的可积极限。极端事件概率出现一个特征峰,这归因于AL方程的离散孤子的相互作用的开始以及伴随的从局部到全局的随机性的转变,通过非线性映射的正李雅普诺夫指数来监测。

英文摘要:

We perform statistical analysis on discrete nonlinear waves generated though modulational instability in the context of the Salerno model that interpolates between the intergable Ablowitz-Ladik (AL) equation and the nonintegrable discrete nonlinear Schrodinger (DNLS) equation. We focus on extreme events in the form of discrete rogue or freak waves that may arise as a result of rapid coalescence of discrete breathers or other nonlinear interaction processes. We find power law dependence in the wave amplitude distribution accompanied by an enhanced probability for freak events close to the integrable limit of the equation. A characteristic peak in the extreme event probability appears that is attributed to the onset of interaction of the discrete solitons of the AL equation and the accompanied transition from the local to the global stochasticity monitored through the positive Lyapunov exponent of a nonlinear map.

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