Bifurcations of Periodic Orbits and Uniform Approximations

Henning Schomerus; Martin Sieber

doi:10.1088/0305-4470/30/13/010

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arXiv · chao-dyn/9701022

Bifurcations of Periodic Orbits and Uniform Approximations

Henning Schomerus·Martin Sieber

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Abstract

We derive uniform approximations for contributions to Gutzwiller's periodic-orbit sum for the spectral density which are valid close to bifurcations of periodic orbits in systems with mixed phase space. There, orbits lie close together and give collective contributions, while the individual contributions of Gutzwiller's type would diverge at the bifurcation. New results for the tangent, the period doubling and the period tripling bifurcation are given. They are obtained by going beyond the local approximation and including higher order terms in the normal form of the action. The uniform approximations obtained are tested on the kicked top and are found to be in excellent agreement with exact quantum results.

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BibTeX RIS

Henning Schomerus, Martin Sieber. 1997-01-22. Bifurcations of Periodic Orbits and Uniform Approximations. https://doi.org/10.1088/0305-4470%2F30%2F13%2F010

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