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arXiv 1901.02501nlin.SInlin.PS
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一维NLS方程可积turbulence的早期阶段:半经典统计方法

Early stage of integrable turbulence in 1D NLS equation: the semi-classical approach to statistics

Giacomo Roberti, Gennady El, Stephane Randoux, Pierre Suret

摘要:

本文研究了一维小色散非线性薛定谔方程(1D-NLSE)在离焦和聚焦区域中可积湍流的统计特性。具体地说,我们研究的1D-NLSE演化的部分相干波高斯统计在时间t=0。使用短时间渐近展开和利用的尺度分离的半经典制度,我们得到一个简单的明确的公式描述的随机波场振幅的四阶矩的演变的早期阶段,定量测量的概率密度函数的“拖尾”。我们的结果显示出良好的协议与数值模拟的全1D-NLSE随机场动力学,并提供洞察的出现,著名的现象,重(分别)。在聚焦中出现的统计分布的低)尾部(分别为散焦)的1D-NLSE机制。

英文摘要:

We examine statistical properties of integrable turbulence in the defocusing and focusing regimes of one-dimensional small-dispersion nonlinear Schrodinger equation (1D-NLSE). Specifically, we study the 1D-NLSE evolution of partially coherent waves having Gaussian statistics at time t=0. Using short time asymptotic expansions and taking advantage of the scale separation in the semi-classical regime we obtain a simple explicit formula describing an early stage of the evolution of the fourth moment of the random wave field amplitude, a quantitative measure of the "tailedness" of the probability density function. Our results show excellent agreement with numerical simulations of the full 1D-NLSE random field dynamics and provide insight into the emergence of the well-known phenomenon of heavy (resp. low) tails of the statistical distribution emerging in the focusing (resp. defocusing) regime of 1D-NLSE.

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