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arXiv math-ph/0401039math-phmath.MP
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PT-对称算子的正则展开与扰动理论

Canonical Expansion of PT-Symmetric Operators and Perturbation Theory

E. Caliceti, S. Graffi

摘要:

设$H$是$L^2(\R^d)$上的任何$ -\hbar^2Δ+(x_1^2+...+x_d^2)+igW(x_1,...,x_d)$型$\PT$对称薛定谔算子,其中$W$是任何奇齐次多项式,$g\in\R$。证明了$¶H$是自伴的,并且它的特征值与$H$的奇异值,即$\sqrt{H^\ast H}$的特征值一致(直到一个符号).此外,我们还明确地构造了$H$的正则展开式,并通过发散微扰理论的Borel可和性确定了$H$的奇异值$μ_j$.奇异值产生估计的位置的特征值$ł_j$的$H$的Weyl不等式。

英文摘要:

Let $H$ be any $\PT$ symmetric Schrödinger operator of the type $ -\hbar^2Δ+(x_1^2+...+x_d^2)+igW(x_1,...,x_d)$ on $L^2(\R^d)$, where $W$ is any odd homogeneous polynomial and $g\in\R$. It is proved that $¶H$ is self-adjoint and that its eigenvalues coincide (up to a sign) with the singular values of $H$, i.e. the eigenvalues of $\sqrt{H^\ast H}$. Moreover we explicitly construct the canonical expansion of $H$ and determine the singular values $μ_j$ of $H$ through the Borel summability of their divergent perturbation theory. The singular values yield estimates of the location of the eigenvalues $ł_j$ of $H$ by Weyl's inequalities.

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