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The Rayleigh-Schrödinger perturbation series of quasi-degenerate systems

arXiv
Authors: Christian Brouder, Gérard H. E. Duchamp, Frédéric Patras, Gabor Zsolt Toth

Year

2010

Paper ID

10534

Status

Preprint

Abstract Read

~2 min

Abstract Words

83

Citations

N/A

Abstract

We present the first representation of the general term of the Rayleigh-Schrödinger series for quasidegenerate systems. Each term of the series is represented by a tree and there is a straightforward relation between the tree and the analytical expression of the corresponding term. The combinatorial and graphical techniques used in the proof of the series expansion allow us to derive various resummation formulas of the series. The relation with several combinatorial objects used for special cases (degenerate or non-degenerate systems) is established.

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  • This paper contributes to the Quantum Simulation research area in the Quantum Articles archive.
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  • We present the first representation of the general term of the Rayleigh-Schrödinger series for quasidegenerate systems.

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