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arXiv 0707.2146math-phmath.MPmath.SP
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半直线上的薛定谔算子:预解展开和阈值下的费米黄金法则

Schrödinger operators on the half line: Resolvent expansions and the Fermi golden rule at thresholds

Arne Jensen, Gheorghe Nenciu

摘要:

我们考虑具有Dirichlet边界条件的$L^2([0,\infty))$上的Schr dinger算子$H=- \d^2/\d r^2+V$.势$V$可以是局部的或非局部的,在无穷远处具有多项式衰减。对$H$谱中的零点进行了分类,得到了预解式在零点附近的渐近展开式,并给出了首项系数的显式表达式。这些结果被应用于嵌入在零处的本征值的扰动以及费米黄金法则的相应修改形式。

英文摘要:

We consider Schrödinger operators $H=- \d^2/\d r^2+V$ on $L^2([0,\infty))$ with the Dirichlet boundary condition. The potential $V$ may be local or non-local, with polynomial decay at infinity. The point zero in the spectrum of $H$ is classified, and asymptotic expansions of the resolvent around zero are obtained, with explicit expressions for the leading coefficients. These results are applied to the perturbation of an eigenvalue embedded at zero, and the corresponding modified form of the Fermi golden rule.

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