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arXiv 0901.4726math.SP
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区域外扰动下Neumann Laplacian的几何收敛与谱收敛

Geometric versus spectral convergence for the Neumann Laplacian under exterior perturbations of the domain

Jose M. Arrieta, David Krejcirik

摘要:

分析了具有齐次Neumann边界条件的Laplace算子在区域扰动时的特征值和特征函数的行为。我们关注的是域的外部扰动,即极限域包含在每个扰动域中。此外,扰动域族由有界域组成,尽管不一定一致有界。我们证明了如果我们知道扰动区域的特征值和特征函数收敛到极限区域的特征值和特征函数,那么我们必然有扰动的测度趋于零,而扰动的Hausdorff距离不一定为真.事实上,我们将构造一个扰动的例子,其中光谱连续,但距离趋于无穷大。

英文摘要:

We analyze the behavior of the eigenvalues and eigenfunctions of the Laplace operator with homogeneous Neumann boundary conditions when the domain is perturbed. We focus on exterior perturbations of the domain, that is, the limit domain is contained in each of the perturbed domains. Moreover, the family of perturbed domains is made up of bounded domains although not necessarily uniformly bounded. We show that if we know that the eigenvalues and eigenfunctions of the perturbed domains converge to the ones of the limit domain, then necessarily we have that the measure of the perturbation tends to zero, while it is not necessarily true for the Hausdorff distance of the perturbation. As a matter of fact we will construct an example of a perturbation where the spectra behave continuously but the distance tends to infinity.

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