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arXiv 2104.00133math.AP
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关于Helmholtz方程薛定谔近似有效性的注记

A note on the validity of the Schrödinger approximation for the Helmholtz equation

Maximilian Klumpp, Guido Schneider

摘要:

真空中的时谐电磁波由Helmholtz方程$Δu+ω^{2}u=0 $描述,方程中的方程为$ (x,y,z) \in \mathbb{R}^3 $。对于这种波沿$z$轴的演化,可以通过多重标度变换导出薛定谔方程。本文的目的是证明这种形式的近似和原系统的真正解决方案之间的界限,证明这种形式的近似。所提出的有效性分析的挑战是,亥姆霍兹方程是不适定作为一个进化系统沿$z$轴。

英文摘要:

Time-harmonic electromagnetic waves in vacuum are described by the Helmholtz equation $Δu+ω^{2}u=0 $ for $ (x,y,z) \in \mathbb{R}^3 $. For the evolution of such waves along the $z$-axis a Schrödinger equation can be derived through a multiple scaling ansatz. It is the purpose of this paper to justify this formal approximation by proving bounds between this formal approximation and true solutions of the original system. The challenge of the presented validity analysis is the fact that the Helmholtz equation is ill-posed as an evolutionary system along the $z$-axis.

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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