论文标题

在非线性schr {Ö} dinger模型中的扭结 - antikink的相互作用力和绑定状态,具有二次和四分之一的分散

Kink-Antikink Interaction Forces and Bound States in a nonlinear Schr{ö}dinger Model with Quadratic and Quartic dispersion

论文作者

Tsolias, G. A., Decker, Robert J., Demirkaya, A., Alexander, T. J., Parker, Ross, Kevrekidis, P. G.

论文摘要

在目前的工作中,我们探讨了在非线性schr {Ö}模型中产生类似扭结的孤立波在产生类似扭结的孤立波中的竞争。我们介绍了Multikink解决方案的前6个家族,并探索它们的分叉,因为二次分散的强度各不相同。我们揭示了该系统的丰富分叉结构,将两条键状态与涉及4-和6键的状态联系起来。探索了所有这些状态的稳定性。对于每个家庭,我们讨论了一个``下级'',该``''''''''''''''``下部''但是,我们还详细研究了``上部分支'',其扭结数量较高。除了计算固定状态并在部分微分方程模型中分析其稳定性外,我们还开发了一种有效的粒子普通微分方程理论,该理论在捕获扭结平衡和正常(以及不稳定)模式方面被证明具有出乎意料的有效效率。最后,分叉分析的结果通过直接数值模拟来证实,涉及以目标方式激发状态,以探索其不稳定性引起的动力学。

In the present work we explore the competition of quadratic and quartic dispersion in producing kink-like solitary waves in a model of the nonlinear Schr{ö}dinger type bearing cubic nonlinearity. We present the first 6 families of multikink solutions and explore their bifurcations as the strength of the quadratic dispersion is varied. We reveal a rich bifurcation structure for the system, connecting two-kink states with states involving 4-, as well as 6-kinks. The stability of all of these states is explored. For each family, we discuss a ``lower branch'' adhering to the energy landscape of the 2-kink states. We also, however, study in detail the ``upper branches'' bearing higher numbers of kinks. In addition to computing the stationary states and analyzing their stability within the partial differential equation model, we develop an effective particle ordinary differential equation theory that is shown to be surprisingly efficient in capturing the kink equilibria and normal (as well as unstable) modes. Finally, the results of the bifurcation analysis are corroborated by means of direct numerical simulations involving the excitation of the states in a targeted way in order to explore their instability-induced dynamics.

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