Location of the interior transmission eigenvalues for a ball
Location of the interior transmission eigenvalues for a ball
复制标题
球的内部传输特征值的位置
DOI:
10.3934/ipi.2017017
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发表时间:
2016
期刊:
影响因子:
--
通讯作者:
G. Vodev
中科院分区:
文献类型:
--
作者:
V. Petkov;G. Vodev
We study the localization of the interior transmission eigenvalues (ITEs) in the case when the domain is the unit ball $\{x \in {\mathbb R}^d:\: |x| \leq 1\}, \: d\geq 2,$ and the coefficients $c_j(x), \: j =1,2,$ and the indices of refraction $n_j(x), \: j =1,2,$ are constants near the boundary $|x| = 1$. We prove that in this case the eigenvalue-free region obtained in [16] for strictly concave domains can be significantly improved. In particular, if $c_j(x), n_j(x), j = 1,2$ are constants for $|x| \leq 1$, we show that all (ITEs) lie in a strip $\{ \lambda \in {\mathbb C}:\:|{\rm Im}\: \lambda| \leq C\}$.