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- W2075094653 abstract "A remarkable extension of Rayleigh–Schrödinger perturbation method is found and described. Its (N+q)×(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." @default.
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- W2075094653 date "2005-06-01" @default.
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- W2075094653 title "Perturbation method for non-square Hamiltonians and its application to polynomial oscillators" @default.
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- W2075094653 doi "https://doi.org/10.1016/j.physleta.2005.04.061" @default.
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