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arXiv 1611.08697nlin.PS
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Zakharov型系统中强高频和低频波的耦合孤子

Coupled solitons of intense high-frequency and low-frequency waves in Zakharov-type systems

Gromov Evgeny, Malomed Boris

摘要:

在Zakharov型模型的框架下,将强HF波的非线性薛定谔方程(NLSE)通过二次项耦合到LF波的Boussinesq(Bq)或Korteweg-de Vries(KdV)方程,得到了高频和低频相互作用波的单参数精确双分量孤波解族.该系统特别适用于分层流体中表面波(HF)和内波(LF)的相互作用。这些解是单分量Bq和KdV孤子的两分量推广。本文用解析和数值方法详细研究了孤立波的扰动动力学和稳定性。基本上,它们是稳定的,对HF和LF分量的分离,如果后者是作为一个势阱作用于HF场,和不稳定的,对分裂的两个组件,与障碍形LF之一。孤波之间的碰撞进行了研究,通过直接模拟,表现出的趋势,合并的同相孤子,和弹性相互作用的异相的。

英文摘要:

One-parameter families of exact two-component solitary-wave solutions for interacting high-frequency (HF) and low-frequency (LF) waves are found in the framework of Zakharov-type models, which couple the nonlinear Schrödinger equation (NLSE) for intense HF waves to the Boussinesq (Bq) or Korteweg - de Vries (KdV) equation for the LF component through quadratic terms. The systems apply, in particular, to the interaction of surface (HF) and internal (LF) waves in stratified fluids. These solutions are two-component generalizations of the single-component Bq and KdV solitons. Perturbed dynamics and stability of the solitary waves are studied in detail by means of analytical and numerical methods. Essentially, they are stable against separation of the HF and LF components if the latter one is shaped as a potential well acting on the HF field, and unstable, against splitting of the two components, with a barrier-shaped LF one. Collisions between the solitary waves are studied by means of direct simulations, demonstrating a trend to merger of in-phase solitons, and elastic interactions of out-of-phase ones.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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