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arXiv 1809.09480math-phmath.MP
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厄米矩阵谱分解的扰动理论

Perturbation theory for the spectral decomposition of Hermitian matrices

Marcus Carlsson

摘要:

设A和E是Hermitian自伴矩阵,其中A是固定的,E是小扰动。我们研究了A+E的特征值和特征向量如何依赖于E,目的是获得一阶公式(如果可能的话,也是二阶公式),这些公式可以根据A的谱分解和E中的元素显式计算。特别是,我们提供明确的Frechet型可微性结果。这些发现可以看作是瑞利-薛定谔系数在一维微扰解析展开式中的推广。

英文摘要:

Let A and E be Hermitian self-adjoint matrices, where A is fixed and E a small perturbation. We study how the eigenvalues and eigenvectors of A+E depend on E, with the aim of obtaining first order formulas (and when possible also second order) that are explicitly computable in terms of the spectral decomposition of A and the entries in E. In particular we provide explicit Frechet type differentiability results. The findings can be seen as an extension of the Rayleigh-Schrödinger coefficients for analytic expansions of one-dimensional perturbations.

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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