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arXiv 0809.4607quant-ph
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δ函数势的微扰和非微扰研究

Perturbative and non-perturbative studies with the delta function potential

Nabakumar Bera, Kamal Bhattacharyya, Jayanta K. Bhattacharjee

摘要:

我们表明,δ函数潜力可以利用微扰理论产生的结果,某些无穷级数。这个想法是,任何精确可解的势,如果与δ函数势耦合,仍然是精确可解的。我们使用Delta函数的强度作为展开参数,并将二阶能量位移表示为微扰论中的无限和。解析解用于确定二阶能量位移,从而确定无穷级数的和。通过对未微扰系统的适当选择,我们可以说明连续谱在束缚态能量移动中的重要性。

英文摘要:

We show that the delta function potential can be exploited along with perturbation theory to yield the result of certain infinite series. The idea is that any exactly soluble potential if coupled with a delta function potential remains exactly soluble. We use the strength of the delta function as an expansion parameter and express the second-order energy shift as an infinite sum in perturbation theory. The analytical solution is used to determine the second-order energy shift and hence the sum of an infinite series. By an appropriate choice of the unperturbed system, we can show the importance of the continuum in the energy shift of bound states.

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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