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arXiv 0811.3707math-phmath.MP
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细支流形上标度薛定谔算子对量子图顶点耦合的逼近

Approximation of quantum graph vertex couplings by scaled Schrödinger operators on thin branched manifolds

Pavel Exner, Olaf Post

摘要:

我们讨论了量子图的顶点耦合的近似使用家庭的细分支流形。我们证明了,如果在这样的流形上的Neumann型拉普拉斯算子被适当的势修正,所得到的薛定谔算子可以近似非平凡的顶点耦合。后者不仅包括三角耦合,而且还包括波函数在顶点处不连续的三角耦合。我们给出了对称δ '耦合的例子,并猜想同样的方法可以应用于所有关于时间反演不变的耦合。

英文摘要:

We discuss approximations of vertex couplings of quantum graphs using families of thin branched manifolds. We show that if a Neumann type Laplacian on such manifolds is amended by suitable potentials, the resulting Schrödinger operators can approximate non-trivial vertex couplings. The latter include not only the delta-couplings but also those with wavefunctions discontinuous at the vertex. We work out the example of the symmetric delta'-couplings and conjecture that the same method can be applied to all couplings invariant with respect to the time reversal.

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