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arXiv 2208.08026math-phmath.APmath.MP
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阻尼非线性波动方程的守恒律与变分结构

Conservation laws and variational structure of damped nonlinear wave equations

Stephen C. Anco, Almudena P. Marquez, Tamara M. Garrido, Maria L. Gandarias

AI总结:

本文针对含时变线性阻尼的一维非线性波动方程,求得全部低阶守恒律,并借助诺特定理揭示其变分结构,其中共形动量与膨胀能量为无阻尼情形所无。

摘要:

对于一类一般的一维非线性波动方程,我们找到了所有低阶守恒律,其中包含允许随时间变化的线性阻尼。这类方程出现在众多物理应用中,并在分析中引起了广泛关注。这些守恒律描述了广义动量与助推动量、共形动量、广义能量、膨胀能量以及光锥能量。其中共形动量和膨胀能量在一维非线性无阻尼波动方程中没有对应物。所有守恒律均可通过诺特定理获得,该定理适用是因为阻尼项可以通过因变量的变换转化为一个随时间变化的自相互作用项。对于其中若干守恒律,相应的变分对称具有一种新颖的形式,不同于一维非线性无阻尼波动方程所允许的任何已知变分对称。

英文摘要:

All low-order conservation laws are found for a general class of nonlinear wave equations in one dimension with linear damping which is allowed to be time-dependent. Such equations arise in numerous physical applications and have attracted much attention in analysis. The conservation laws describe generalized momentum and boost momentum, conformal momentum, generalized energy, dilational energy, and light-cone energies. Both the conformal momentum and dilational energy have no counterparts for nonlinear undamped wave equations in one dimension. All of the conservation laws are obtainable through Noether's theorem, which is applicable because the damping term can be transformed into a time-dependent self-interaction term by a change of dependent variable. For several of the conservation laws, the corresponding variational symmetries have a novel form which is different than any of the well known variation symmetries admitted by nonlinear undamped wave equations in one dimension.

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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