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arXiv math-ph/0405010math-phgr-qcmath.MPmath.SP
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球面波算子的谱估计和非自伴扰动

Spectral Estimates and Non-Selfadjoint Perturbations of Spheroidal Wave Operators

Felix Finster, Harald Schmid

摘要:

本文导出了在实直线邻域内以非球面参数$Ω$为全纯的扁球面波算子的谱表示。对于实$Ω$,所有的特征值间隙一致地在$Ω$的估计。间隙估计的证明是基于Riccati方程的复解的详细估计。利用微非自伴扰动理论导出了复$Ω$的谱表示。

英文摘要:

We derive a spectral representation for the oblate spheroidal wave operator which is holomorphic in the aspherical parameter $Ω$ in a neighborhood of the real line. For real $Ω$, estimates are derived for all eigenvalue gaps uniformly in $Ω$. The proof of the gap estimates is based on detailed estimates for complex solutions of the Riccati equation. The spectral representation for complex $Ω$ is derived using the theory of slightly non-selfadjoint perturbations.

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