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arXiv math-ph/0601006math-phmath.MP
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欧几里德拉普拉斯本征函数在边界上的拟正交性

Quasi-orthogonality on the boundary for Euclidean Laplace eigenfunctions

Alex H. Barnett

摘要:

考虑R^d中有界区域中的拉普拉斯算子,具有一般(混合)齐次边界条件。我们证明了它的本征函数是“准正交”的边界上就一定的范数。当E->无穷大时,边界正交性在以E为中心的宽度为o(E^{1/2})的窄特征值窗口内被渐近地证明.对于Dirichlet边界条件的特殊情况,法向导数函数在边界上关于几何权函数r. n是准正交的。结果是独立的任何量子遍历性假设,因此域的测地线流的性质,但是,如果这是遍历然后启发式半经典的结果,建议改进的渐近估计。边界准正交性是拉普拉斯本征问题在大本征值下数值解的高效“尺度法”的关键。本文的主要结果之一,然后将这种方法放在一个更严格的基础。

英文摘要:

Consider the Laplacian in a bounded domain in R^d with general (mixed) homogeneous boundary conditions. We prove that its eigenfunctions are `quasi-orthogonal' on the boundary with respect to a certain norm. Boundary orthogonality is proved asymptotically within a narrow eigenvalue window of width o(E^{1/2}) centered about E, as E->infinity. For the special case of Dirichlet boundary conditions, the normal-derivative functions are quasi-orthogonal on the boundary with respect to the geometric weight function r.n. The result is independent of any quantum ergodicity assumptions and hence of the nature of the domain's geodesic flow; however if this is ergodic then heuristic semiclassical results suggest an improved asymptotic estimate. Boundary quasi-orthogonality is the key to a highly efficient `scaling method' for numerical solution of the Laplace eigenproblem at large eigenvalue. One of the main results of this paper is then to place this method on a more rigorous footing.

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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