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Recursive Green's function approach to Feenberg perturbation theory

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arxiv 1904.00957 v1 pith:FENKNFKT submitted 2019-04-01 quant-ph

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keywords perturbationgreentheoryfeenbergfunctionsrecursiveapproachbrillouin-wigner
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We propose a new procedure by using the recursive Green's functions which remove all the repetition terms from the time-independent perturbation series for finite-level quantum systems. These Green's functions are introduced as a generalization of the Brillouin-Wigner perturbation theory and the calculations of their diagonal elements can naturally give the effective propagators which are equal to the ones in the Feenberg perturbation theory.

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