Periodic Orbits in a Simple Ray-Splitting System

Details Periodic Orbits in a Simple Ray-Splitting System Periodic Orbits in a Simple Ray-Splitting System

1996-08-28

arxiv.org/abs/chao-dyn/9608018v1

Phys. Rev. E 54 (1996) 1232

Nonlinear Sciences

Chaotic Dynamics

15 pages (Latex) including 5 figures

Scientific paper

10.1103/PhysRevE.54.1232

We study ray dynamics in a square billiard that allows mode conversion and is parametrised by $\kappa$, the ratio of the velocities of the two modes. At $\kappa \rightarrow 1^+$, conversion occurs at every reflection and periodic orbits proliferate exponentially. As $\kappa$ increases beyond $\sqrt{2}$, the collection of daughter rays explore only three momentum directions and mode conversion is progressively inhibited. We provide an algorithm for determining periodic orbits when $\kappa > \sqrt{2}$ and show numerically that exponential proliferation persists around $\kappa \simeq \sqrt{2}$ but as $\kappa$ increases, a crossover to sub-exponential behaviour occurs for short periods. We discuss these results in the light of conservation laws.

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