Bifurcations of Periodic Orbits and Uniform Approximations

Details Bifurcations of Periodic Orbits and Uniform Approximations Bifurcations of Periodic Orbits and Uniform Approximations

1997-01-22

arxiv.org/abs/chao-dyn/9701022v1

J. Phys. A 30 (1997) 4537-4562

Nonlinear Sciences

Chaotic Dynamics

LaTeX, 24 pages including 7 PostScript figures, submitted to J. Phys. A

Scientific paper

10.1088/0305-4470/30/13/010

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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