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- W1970779667 abstract "We study an example of a perturbed Floquet Hamiltonian depending on a coupling constant . The spectrum is pure point and dense. We pick up an eigenvalue, namely , and show the existence of a function defined on such that for all , 0 is a point of density for the set I, and the Rayleigh - Schrödinger perturbation series represents an asymptotic series for the function . All ideas are developed and demonstrated when treating the explicit example, but some of them are expected to have an essentially wider range of application." @default.
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- W1970779667 date "1997-10-21" @default.
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- W1970779667 title "Perturbation of an eigenvalue from a dense point spectrum: an example" @default.
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- W1970779667 doi "https://doi.org/10.1088/0305-4470/30/20/018" @default.
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