arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2008.08874nlin.PSnlin.SI
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含噪声箱形波场中的孤子:微扰理论与统计

Solitons in a box-shaped wavefield with noise: perturbation theory and statistics

Rustam Mullyadzhanov, Andrey Gelash

摘要:

利用逆散射变换理论研究了初始条件扰动下非线性波场散射数据校正的基本问题。我们提出了一个完整的理论线性微扰框架内的可积一维聚焦非线性薛定谔(NLSE)方程的散射数据的全套评估一阶校正。一般的散射数据的肖像揭示了非线性相干结构-孤子-发挥关键作用的波场演化。应用发展的理论,一个经典的盒形波场,我们求解导出的方程解析的一个单一的傅立叶模式作为一个扰动的初始条件,从而导致的基本孤子特性,即振幅,速度,相位和位置的灵敏度封闭形式的表达式。通过适当的统计平均,我们模拟了孤子噪声引起的孤子参数的标准偏差的紧凑关系。依赖于一个虚拟的孤子本征值的概念,我们得出的概率孤子出现或相反,由于噪声和说明这些理论预测与直接数值模拟的NLSE演化。该框架可以推广到其他可积系统和波场模式。

英文摘要:

We investigate the fundamental problem of the nonlinear wavefield scattering data corrections in response to a perturbation of initial condition using inverse scattering transform theory. We present a complete theoretical linear perturbation framework to evaluate first-order corrections of the full set of the scattering data within the integrable one-dimensional focusing nonlinear Schrödinger (NLSE) equation. The general scattering data portrait reveals nonlinear coherent structures - solitons - playing the key role in the wavefield evolution. Applying the developed theory to a classic box-shaped wavefield we solve the derived equations analytically for a single Fourier mode acting as a perturbation to the initial condition, thus, leading to the sensitivity closed-form expressions for basic soliton characteristics, i.e. the amplitude, velocity, phase and its position. With the appropriate statistical averaging we model the soliton noise-induced effects resulting in compact relations for standard deviations of soliton parameters. Relying on a concept of a virtual soliton eigenvalue we derive the probability of a soliton emergence or the opposite due to noise and illustrate these theoretical predictions with direct numerical simulations of the NLSE evolution. The presented framework can be generalised to other integrable systems and wavefield patterns.

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