Henning Schomerus and Martin Sieber 1997 J. Phys. A: Math. Gen. 30 4537 doi:10.1088/0305-4470/30/13/010
Bifurcations of periodic orbits and uniform approximations
Henning Schomerus
and Martin Sieber
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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Issue 13 (7 July 1997)
Received 27 January 1997, in final form 2 May 1997
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Bifurcations of periodic orbits and uniform approximations
Henning Schomerus and Martin Sieber 1997 J. Phys. A: Math. Gen. 30 4537
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