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arXiv 2002.08499nlin.PS
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关于可积和不可积非线性格点中孤立波的产生和传播

On the generation and propagation of solitary waves in integrable and non-integrable nonlinear lattices

Guo Deng, Gino Biondini, Surajit Sen, Panayotis Kevrekidis

摘要:

我们研究了赫兹链和户田晶格中孤立波的产生和传播,目的是突出这些系统之间的相似之处,以及差异。我们首先讨论了这些系统中孤立波的动能和势能,并表明在某些情况下,这些系统中的动能和势能分布(即,它们的空间分布)看起来彼此相当接近。虽然这一点和其他特征,如波的振幅和总能量之间的联系,在两个模型之间有相似之处,但也有显着的差异,如波的宽度。然后,我们研究了这些系统的动力学行为的初始速度脉冲。对于户田晶格,我们这样做,通过采用逆散射变换,我们得到的孤立波的能量和脉冲的能量之间的比率,作为脉冲速度的函数解析;然后,我们比较的户田系统的赫兹系统的动力学,通过数值模拟获得相应的数量。在后一种系统中,我们得到了一个普遍性的分数的能量存储在所产生的孤立行波的大小无关的脉冲。这个分数原来只取决于非线性指数。最后,我们研究了所产生的孤立波速度与脉冲速度之间的关系。特别是,我们提供了一个替代的证明赫兹型系统的数值标度规则。

英文摘要:

We investigate the generation and propagation of solitary waves in the context of the Hertz chain and Toda lattice, with the aim to highlight the similarities, as well as differences between these systems. We begin by discussing the kinetic and potential energy of a solitary wave in these systems, and show that under certain circumstances the kinetic and potential energy profiles in these systems (i.e., their spatial distribution) look reasonably close to each other. While this and other features, such as the connection between the amplitude and the total energy of the wave bear similarities between the two models, there are also notable differences, such as the width of the wave. We then study the dynamical behavior of these systems in response to an initial velocity impulse. For the Toda lattice, we do so by employing the inverse scattering transform, and we obtain analytically the ratio between the energy of the resulting solitary wave and the energy of the impulse, as a function of the impulse velocity; we then compare the dynamics of the Toda system to that of the Hertz system, for which the corresponding quantities are obtained through numerical simulations. In the latter system, we obtain a universality in the fraction of the energy stored in the resulting solitary traveling wave irrespectively of the size of the impulse. This fraction turns out to only depend on the nonlinear exponent. Finally, we investigate the relation between the velocity of the resulting solitary wave and the velocity of the impulse. In particular, we provide an alternative proof for the numerical scaling rule of Hertz type systems.

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