Perturbative and non-perturbative studies with the delta function potential

Details Perturbative and non-perturbative studies with the delta function potential Perturbative and non-perturbative studies with the delta function potential

2008-09-26

arxiv.org/abs/0809.4607v1

Am. J. Phys. 76(3), March 2008, 250-257

Physics

Quantum Physics

19 pages, 2 tables

Scientific paper

10.1119/1.2830531

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.

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