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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


Many-Body Perturbation Theory
✍ Tobocman, W. 📂 Article 📅 1957 🏛 The American Physical Society 🌐 English ⚖ 496 KB
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## 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

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## 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