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arXiv 1503.04314math-phmath.MP
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一类伪厄米特算子的截断

Truncations of a class of pseudo-Hermitian operators

Maxim Derevyagin, Luca Perotti, Michal Wojtylak

摘要:

本文研究了一类由无穷三对角矩阵表示的非厄米特算子,它们在具有一个负平方的不定内积空间中自伴。我们用它们的有限截断来近似它们。无穷大矩阵和截断矩阵都有非正型特征值:实轴上只有一个特征值,或者有两个复共轭特征值。作为一种工具,以评估的可靠性,在数值模拟中使用截断,我们给他们的非正型特征值的收敛速度的界限。数值例子说明了我们的结果。

英文摘要:

We consider the class of non-Hermitian operators represented by infinite tridiagonal matrices, selfadjoint in an indefinite inner product space with one negative square. We approximate them with their finite truncations. Both infinite and truncated matrices have eigenvalues of nonpositive type: either a single one on the real axis or a couple of complex conjugate ones. As a tool to evaluate the reliability of the use of truncations in numerical simulations, we give bounds for the rate of convergence of their eigenvalues of nonpositive type. Numerical examples illustrate our results.

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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