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arXiv 0908.2327math.APmath.SP
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R^d中薄区域上Laplacian算子的Dirichlet特征值和特征函数的渐近性

Asymptotics of Dirichlet eigenvalues and eigenfunctions of the Laplacian on thin domains in R^d

Denis Borisov, Pedro Freitas

摘要:

考虑R^d中区域上具有Dirichlet边界条件的Laplace算子,研究在一个方向上执行缩放对本征值和相应本征函数作为缩放参数在零附近的函数的影响。这推广了我们以前的结果在两个维度,并在这种情况下,使我们能够获得一个近似的Dirichlet特征值为一大类域,在非常温和的假设。作为应用,我们导出了d维椭球第一特征值的三项渐近展开。

英文摘要:

We consider the Laplace operator with Dirichlet boundary conditions on a domain in R^d and study the effect that performing a scaling in one direction has on the eigenvalues and corresponding eigenfunctions as a function of the scaling parameter around zero. This generalizes our previous results in two dimensions and, as in that case, allows us to obtain an approximation for Dirichlet eigenvalues for a large class of domains, under very mild assumptions. As an application, we derive a three--term asymptotic expansion for the first eigenvalue of d-dimensional ellipsoids.

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