| Issue |
Europhys. Lett.
Volume 49, Number 5, March I 2000
|
|
|---|---|---|
| Page(s) | 554 - 557 | |
| Section | Atomic and molecular physics | |
| DOI | https://doi.org/10.1209/epl/i2000-00186-5 | |
| Published online | 01 September 2002 | |
A robust perturbation theory for degenerate states based on exact constants of the motion
1
Department of Physics, Auburn University - Auburn, Alabama 36849-5311, USA
2
School of Physics, Georgia Institute of Technology - Atlanta, Georgia 30332-0430, USA
Received:
19
August
1999
Accepted:
15
December
1999
Infinite summations over unperturbed degenerate and nondegenerate states are a common feature when calculating corrections induced by a perturbation to degenerate states. We present an innovative mapping which simplifies these summations drastically when the perturbed problem is known to have an exact constant of the motion.
PACS: 31.15.Md – Perturbation theory / 03.65.Ge – Solutions of wave equations: bound states
© EDP Sciences, 2000
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