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arXiv 2008.09581math-phmath.MPquant-ph
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薛定谔方程的谱求和规则

Spectral sum rules for the Schrödinger equation

Paolo Amore

摘要:

本文研究了$Z(s) = \sum_n E_n^{-s}$形式的求和规则,其中$E_n$是与时间无关的薛定谔方程(一维或多维)的特征值,$s$是级数收敛的有理数.我们已经用扰动理论获得了一个明确的公式的总和规则的第二阶的扰动,我们已经延长了它的非微扰的Padé-逼近。对于一个盒子在一维中被一个杂质装饰的特殊情况,我们精确地计算了整数阶的前几个求和规则;对于一个盒子有两个杂质的问题,我们也精确地计算了一阶求和规则。在二维中,我们考虑了杂质分布在任意半径的圆上的情况,并计算了二阶的精确求和规则。最后,我们证明了在一维空间中,通过将薛定谔方程变换为具有适当密度的Helmholtz方程,可以得到精确的求和规则。

英文摘要:

We study the sum rules of the form $Z(s) = \sum_n E_n^{-s}$, where $E_n$ are the eigenvalues of the time--independent Schrödinger equation (in one or more dimensions) and $s$ is a rational number for which the series converges. We have used perturbation theory to obtain an explicit formula for the sum rules up to second order in the perturbation and we have extended it non--perturbatively by means of a Padé--approximant. For the special case of a box decorated with one impurity in one dimension we have calculated the first few sum rules of integer order exactly; the sum rule of order one has also been calculated exactly for the problem of a box with two impurities. In two dimensions we have considered the case of an impurity distributed on a circle of arbitrary radius and we have calculated the exact sum rules of order two. Finally we show that exact sum rules can be obtained, in one dimension, by transforming the Schrödinger equation into the Helmholtz equation with a suitable density.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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