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arXiv math-ph/0604013math-phmath.MPmath.SP
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散射矩阵和Weyl函数

Scattering matrices and Weyl functions

Jussi Behrndt, Mark M. Malamud, Hagen Neidhardt

摘要:

对于由有限亏指数对称算子$A$的自伴扩张$A_Θ$和$A_0$组成的散射系统$\{A_Θ,A_0\}$,用与$A^*$边界三元组相联系的Weyl函数计算了散射矩阵$\{S_\gT(\gl)\}$和谱移函数$ξ_Θ$,并给出了Krein-Birman公式的简单证明.结果适用于奇异Sturm-Liouville算子的标量和矩阵的潜力,狄拉克运营商和薛定谔运营商与点的相互作用。

英文摘要:

For a scattering system $\{A_Θ,A_0\}$ consisting of selfadjoint extensions $A_Θ$ and $A_0$ of a symmetric operator $A$ with finite deficiency indices, the scattering matrix $\{S_\gT(\gl)\}$ and a spectral shift function $ξ_Θ$ are calculated in terms of the Weyl function associated with the boundary triplet for $A^*$ and a simple proof of the Krein-Birman formula is given. The results are applied to singular Sturm-Liouville operators with scalar and matrix potentials, to Dirac operators and to Schrödinger operators with point interactions.

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