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arXiv math-ph/0511029math-phmath.MP
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Schrodinger算子的收敛性

Convergence of Schrodinger operators

J. F. Brasche, K. Ozanova

摘要:

对于R^d上的一大族实值Radon测度m,包括Kato类,当C趋于零时,算子-Δ+ C^2 Δ^2 + m在范数预解式意义下趋于薛定谔算子-Δ+m。如果测度是有限的且维数小于4,则前一个算子可以用一个具有范数预解式意义下的点测度的算子序列来逼近。这两个收敛结果的结合给出了数值计算薛定谔算子离散谱中本征值和相应本征函数的有效方法。我们通过数值计算测度m的一个简单例子的特征值来说明这种近似。

英文摘要:

For a large family of real-valued Radon measures m on R^d, including the Kato class, the operators -Δ+ C^2 Δ^2 + m tend to the Schrodinger operator -Δ+m in the norm resolvent sense as C tends to zero. If the measure is moreover finite and the dimension smaller than four, the former operator can be approximated by a sequence of operators with point measures in the norm resolvent sense. The combination of both convergence results leads to an efficient method for the numerical computation of the eigenvalues in the discrete spectrum and corresponding eigenfunctions of Schrodinger operators. We illustrate the approximation by numerical calculations of eigenvalues for one simple example of measure m.

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