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arXiv 0906.2631math.FAmath.SP
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正规算子p-从属扰动的Riesz基

Riesz Bases for p-Subordinate Perturbations of Normal Operators

Christian Wyss

摘要:

对无界正规算子的p-从属扰动,研究了谱的变化,建立了带根向量括号的Riesz基存在的谱判据.在扰动算子谱的一个额外的先验假设下,得到了一个不带括号的Riesz基。结果被应用到两类块算子矩阵。

英文摘要:

For p-subordinate perturbations of unbounded normal operators, the change of the spectrum is studied and spectral criteria for the existence of a Riesz basis with parentheses of root vectors are established. A Riesz basis without parentheses is obtained under an additional a priori assumption on the spectrum of the perturbed operator. The results are applied to two classes of block operator matrices.

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