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arXiv 2302.01426nlin.PS
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二维和三维空间中的散焦非线性薛定谔方程的Whitham调制理论

Whitham modulation theory for the defocusing nonlinear Schrodinger equation in two and three spatial dimensions

Asela Abeya, Gino Biondini, Mark A. Hoefer

AI总结:

本文推导了二维及更高维散焦非线性薛定谔方程的Whitham调制方程,以矢量形式保持对称性,并给出Riemann变换、谐波与孤子极限及径向约化,可用于研究大幅波列。

摘要:

本文利用周期行波解的双相位假设,并对非线性薛定谔(NLS)方程的守恒律进行周期平均,推导了二维、三维及更高空间维度中散焦非线性薛定谔方程的Whitham调制方程。所得的Whitham调制方程以矢量形式写出,这使我们能够证明它们保持了NLS方程的旋转不变性,以及关于缩放和伽利略变换的不变性,并能立即将计算从二维空间推广到三维。详细描述了向Riemann型变量的变换;明确写出了Whitham调制方程的谐波极限和孤子极限;并显式地进行了Whitham方程向径向NLS方程的约化。最后,简要概述了该理论向更高空间维度的扩展。这里得到的多维NLS-Whitham方程可用于研究多种应用中的大幅波列,包括非线性光子学和物质波。

英文摘要:

The Whitham modulation equations for the defocusing nonlinear Schrodinger (NLS) equation in two, three and higher spatial dimensions are derived using a two-phase ansatz for the periodic traveling wave solutions and by period-averaging the conservation laws of the NLS equation. The resulting Whitham modulation equations are written in vector form, which allows one to show that they preserve the rotational invariance of the NLS equation, as well as the invariance with respect to scaling and Galilean transformations, and to immediately generalize the calculations from two spatial dimensions to three. The transformation to Riemann-type variables is described in detail; the harmonic and soliton limits of the Whitham modulation equations are explicitly written down; and the reduction of the Whitham equations to those for the radial NLS equation is explicitly carried out. Finally, the extension of the theory to higher spatial dimensions is briefly outlined. The multidimensional NLS-Whitham equations obtained here may be used to study large amplitude wavetrains in a variety of applications including nonlinear photonics and matter waves.

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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