Spectral analysis and domain truncation for Maxwell's equations
Spectral analysis and domain truncation for Maxwell's equations
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麦克斯韦方程组的谱分析和域截断
DOI:
10.1016/j.matpur.2022.12.004
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发表时间:
2023
期刊:
影响因子:
--
通讯作者:
Bögli S
中科院分区:
文献类型:
--
作者:
Bögli S
We analyse how the spectrum of the anisotropic Maxwell system with bounded conductivity σ on a Lipschitz domain Ω is approximated by domain truncation. First we prove a new non-convex enclosure for the spectrum of the Maxwell system, with weak assumptions on the geometry of Ω and none on the behaviour of the coefficients at infinity. We also establish a simple criterion for non-accumulation of eigenvalues at i R as well as resolvent estimates. For asymptotically constant coefficients, we describe the essential spectrum and show that spectral pollution may occur only in the essential numerical range W e (L∞)⊂ R of the quadratic pencil L∞(ω)= μ∞− 1 curl 2− ω 2 ε∞, acting on divergence-free vector fields. Further, every isolated spectral point of the Maxwell system lying outside W e (L∞) and outside the part of the essential spectrum on i R is approximated by spectral points of the Maxwell system on the truncated domains. Our analysis is based on two new abstract results on the (limiting) essential spectrum of polynomial pencils and triangular block operator matrices, which are of general interest. We believe our strategy of proof could be used to establish domain truncation spectral exactness for more general classes of non-self-adjoint differential operators and systems with non-constant coefficients.
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DOI:
--
发表时间:
2017
期刊:
影响因子:
--
作者:
C. Carvalho;L. Chesnel;P. Ciarlet
通讯作者:
P. Ciarlet
影响因子:
4.1
作者:
BERENGER, JP
通讯作者:
BERENGER, JP
影响因子:
2.9
作者:
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通讯作者:
C. Weber;P. Werner
DOI:
--
发表时间:
2014
期刊:
影响因子:
--
作者:
A. Dhia;L. Chesnel;P. Ciarlet
通讯作者:
P. Ciarlet
影响因子:
1.5
作者:
M. Eller
通讯作者:
M. Eller