Perturbation theory for the degenerate case in the many-body problem
✍ Scribed by G. Oberlechner; F. Owono-N’-Guema; J. Richert
- Book ID
- 110646277
- Publisher
- Springer-Verlag,Italian Physical Society
- Year
- 1970
- Weight
- 874 KB
- Volume
- 68
- Category
- Article
- ISSN
- 0369-3554
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📜 SIMILAR VOLUMES
## Abstract An adiabatic formula for the contracted Hamiltonian in a reference space containing bound‐state eigenfunctions of degenerate energy levels embedded in the continuum is derived. A general factorization theorem for the dynamic operator__S__~α~(0, – ∞/λ) is proved, and the cancellation of
## Abstract Adiabatic formulae for secular operators and contracted Hamiltonians in an arbirary combination of degenerate or quasidegenerate subspaces are derived. A detailed consideration of the adiabatic limit in the power series is given, and “stability” of proper linear combinations with respec