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arXiv 2007.13222nlin.PS
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二维Sine-Gordon方程的呼吸子条纹和径向呼吸子

Breather stripes and radial breathers of the two-dimensional sine-Gordon equation

P. G. Kevrekidis, R. Carretero-González, J. Cuevas-Maraver, D. J. Frantzeskakis, J. -G. Caputo, B. A. Malomed

摘要:

我们重新审视的问题的横向不稳定性的二维呼吸带的sine-Gordon(SG)方程。数值计算的Floquet光谱的条纹相比,通过多尺度微扰理论显示出良好的协议,在长波长限制的分析预测。通过直接模拟,它被发现,不稳定性导致的准一维呼吸链中的相互作用的2D径向呼吸,似乎是相当强大的动力学崩溃。本文用数值方法详细研究了有限区域内径向呼吸器的稳定性和动力学特性。不同的家庭这样的解决方案被确定。它们通过高阶呼吸者谐波与属于连续谱的线性模式(“声子”)的共振,发展出小振幅空间振荡尾(“纳米翅”)。这些结果证明了我们的有限域计算中的2D SG模型在长寿命的自陷呼吸激发中局部化能量的能力。

英文摘要:

We revisit the problem of transverse instability of a 2D breather stripe of the sine-Gordon (sG) equation. A numerically computed Floquet spectrum of the stripe is compared to analytical predictions developed by means of multiple-scale perturbation theory showing good agreement in the long-wavelength limit. By means of direct simulations, it is found that the instability leads to a breakup of the quasi-1D breather in a chain of interacting 2D radial breathers that appear to be fairly robust in the dynamics. The stability and dynamics of radial breathers in a finite domain are studied in detail by means of numerical methods. Different families of such solutions are identified. They develop small-amplitude spatially oscillating tails ("nanoptera") through a resonance of higher-order breather's harmonics with linear modes ("phonons") belonging to the continuous spectrum. These results demonstrate the ability of the 2D sG model within our finite domain computations to localize energy in long-lived, self-trapped breathing excitations.

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