Semiclassical Transition from an Elliptical to an Oval Billiard

Abstract

Semiclassical approximations often involve the use of stationary phase approximations. This method can be applied when $\hslash$ is small in comparison to relevant actions or action differences in the corresponding classical system. In many situations, however, action differences can be arbitrarily small and then uniform approximations are more appropriate. In the present paper we examine different uniform approximations for describing the spectra of integrable systems and systems with mixed phase space. This is done on the example of two billiard systems, an elliptical billiard and a deformation of it, an oval billiard. We derive a trace formula for the ellipse which involves a uniform approximation for the Maslov phases near the separatrix, and a uniform approximation for tori of periodic orbits close to a bifurcation. We then examine how the trace formula is modified when the ellipse is deformed into an oval. This involves uniform approximations for the break-up of tori and uniform approximations for bifurcations of periodic orbits. Relations between different uniform approximations are discussed.

LaTeX, 33 pages including 10 PostScript figures, submitted to J. Phys. A

References in corpus (3)

• Bifurcations of Periodic Orbits and Uniform Approximations
• How Chaotic is the Stadium Billiard? A Semiclassical Analysis
• Uniform approximation for diffractive contributions to the trace formula in billiard systems

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