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arXiv 2009.07903math-phmath.MPnlin.PS
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相动力学中的真实非线性及其与修正Korteweg-de Vries方程的关系

Genuine Nonlinearity and its Connection to the Modified Korteweg - de Vries Equation in Phase Dynamics

Daniel James Ratliff

摘要:

双曲波的研究涉及到各种概念,这些概念有助于了解这些结构如何演变。一个重要的方面是\emph{genuine nonlinearity}的概念,即形成冲击和稀疏而不是接触不连续的能力。在Whitham调制方程的背景下,本文证明,真正的非线性损失导致的外观的一组分散的动力学的形式的修改Korteweg de-Vries方程控制的波的演变,而不是。它的形式是通用的,因为它的系数可以完全使用下伏波的线性性质(例如守恒律和线性色散关系)来写。这一见解适用于两个系统的物理利益,一个光学模型和其他分层流体力学实验,演示它如何可以用来提供洞察波在这些系统中如何演变时,真正的非线性丢失。

英文摘要:

The study of hyperbolic waves involves various notions which help characterise how these structures evolve. One important facet is the notion of \emph{genuine nonlinearity}, namely the ability for shocks and rarefactions to form instead of contact discontinuities. In the context of the Whitham Modulation equations, this paper demonstrate that a loss of genuine nonlinearity leads to the appearance of a dispersive set of dynamics in the form of the modified Korteweg de-Vries equation governing the evolution of the waves instead. Its form is universal in the sense that its coefficients can be written entirely using linear properties of the underlying waves such as the conservation laws and linear dispersion relation. This insight is applied to two systems of physical interest, one an optical model and the other a stratified hydrodynamics experiment, to demonstrate how it can be used to provide insight into how waves in these systems evolve when genuine nonlinearity is lost.

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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