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arXiv 1702.01798math.AP
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Neumann-Poincaré算子特征值的均匀化

Homogenization of the eigenvalues of the Neumann-Poincaré operator

Eric Bonnetier, Charles Dapogny, Faouzi Triki

摘要:

本文研究了大小为$\varepsilon$的小夹杂周期分布的Neumann-Poincaré算子的谱,以及当参数$\varepsilon$为零时的渐近行为.结合技术有关领域的均匀化和位势论,我们证明了极限谱是由“平凡”的本征值$0$和$1$,和一个子集,保持有界远离$0$和$1$均匀相对于$\varepsilon$。这个不平凡的部分是\textit{Bloch spectrum}的团聚,占夹杂物的集合之间的集体共振,和\textit{boundary layer spectrum},相关的本征函数,花费不太小的一部分,其能量附近的边界的宏观设备。这些结果揭示了新的光均匀化的电压电位$u_\varepsilon$所造成的一个给定的源在一个由周期性分布的小夹杂物组成的介质中的任意(可能是负的)导电性$a$,周围的电介质,与单位电导率。特别是,我们证明了$u_\varepsilon$的极限行为是强烈相关的(可能是不明确的)均匀化扩散矩阵预测的均匀化理论在标准的椭圆形的情况下。此外,我们证明了均匀化的$u_\varepsilon$总是可能的,当$a$是积极的,或负的“小”或“大”的模量。

英文摘要:

In this article, we investigate the spectrum of the Neumann-Poincaré operator associated to a periodic distribution of small inclusions with size $\varepsilon$, and its asymptotic behavior as the parameter $\varepsilon$ vanishes. Combining techniques pertaining to the fields of homogenization and potential theory, we prove that the limit spectrum is composed of the `trivial' eigenvalues $0$ and $1$, and of a subset which stays bounded away from $0$ and $1$ uniformly with respect to $\varepsilon$. This non trivial part is the reunion of the \textit{Bloch spectrum}, accounting for the collective resonances between collections of inclusions, and of the \textit{boundary layer spectrum}, associated to eigenfunctions which spend a not too small part of their energies near the boundary of the macroscopic device. These results shed new light about the homogenization of the voltage potential $u_\varepsilon$ caused by a given source in a medium composed of a periodic distribution of small inclusions with an arbitrary (possible negative) conductivity $a$, surrounded by a dielectric medium, with unit conductivity. In particular, we prove that the limit behavior of $u_\varepsilon$ is strongly related to the (possibly ill-defined) homogenized diffusion matrix predicted by the homogenization theory in the standard elliptic case. Additionally, we prove that the homogenization of $u_\varepsilon$ is always possible when $a$ is either positive, or negative with a `small' or `large' modulus.

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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