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arXiv 2110.04586math.APmath-phmath.FAmath.MPmath.SPphysics.optics
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Maxwell算子的M-耗散边界条件和边界元组

M-dissipative boundary conditions and boundary tuples for Maxwell operators

Matthias Eller, Illya M. Karabash

摘要:

对于Lipschitz域上的Maxwell算子$(E,H) \to (i ε^{-1} \nabla\times H, -i μ^{-1} \nabla \times E)$,我们描述了所有的m-耗散边界条件,并将此结果应用于广义阻抗和Leontovich边界条件,包括奇异、退化和随机阻抗系数的情况.为此,我们构造Riesz基的迹空间与卷曲算子,并介绍了一个修改版本的边界三元组适用于具体的麦克斯韦方程组,即,相关的迹空间的混合阶对偶。这提供了一个翻译的问题,以运营商的理论设置抽象麦克斯韦运营商。特别是,我们表明,卡尔金约化算子自然连接Leontovich边界条件,并提供了一个抽象版本的阻抗边界条件适用于其他类型的波动方程。利用相关边界算子的Friedrichs和Krein-von Neumann扩展,可以将m-耗散Maxwell算子与任意非负可测阻抗系数相关联。

英文摘要:

For Maxwell operators $(E,H) \to (i ε^{-1} \nabla\times H, -i μ^{-1} \nabla \times E)$ in Lipschitz domains, we describe all m-dissipative boundary conditions and apply this result to generalized impedance and Leontovich boundary conditions including the cases of singular, degenerate, and randomized impedance coefficients. To this end we construct Riesz bases in the trace spaces associated with the curl-operator and introduce a modified version of boundary triple adapted for the specifics of Maxwell equations, namely, to the mixed-order duality of the related trace spaces. This provides a translation of the problem to operator-theoretic settings of abstract Maxwell operators. In particular, we show that Calkin reduction operators are naturally connected with Leontovich boundary conditions and provide an abstract version of impedance boundary condition applicable to other types of wave equations. Taking Friedrichs and Krein-von Neumann extensions of related boundary operators, it is possible to associate m-dissipative Maxwell operators to arbitrary non-negative measurable impedance coefficients.

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