Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9868073 | Physics Letters A | 2005 | 14 Pages |
Abstract
A remarkable extension of Rayleigh-Schrödinger perturbation method is found and described. Its (N+q)Ã(N+1)-dimensional Hamiltonians are assumed emerging during quasi-exact constructions of bound states. At all q>1, the role of the traditional single eigenvalue is taken over by an energy/coupling q-plet. In a way circumventing both the non-linearity and non-Hermiticity difficulties, the corrections are defined by compact, q-dimensional matrix-inversion formulae.
Related Topics
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Authors
Miloslav Znojil,