Classification of symmetric periodic trajectories in ellipsoidal billiards

Details Classification of symmetric periodic trajectories in ellipsoidal billiards Classification of symmetric periodic trajectories in ellipsoidal billiards

2012-03-28

arxiv.org/abs/1203.6188v1

Mathematics

Dynamical Systems

26 pages, 77 figures, 17 tables

Scientific paper

We classify nonsingular symmetric periodic trajectories (SPTs) of billiards inside ellipsoids of R^{n+1} without any symmetry of revolution. SPTs are defined as periodic trajectories passing through some symmetry set. We prove that there are exactly 2^{2n}(2^{n+1}-1) classes of such trajectories. We have implemented an algorithm to find minimal SPTs of each of the 12 classes in the 2D case (R^2) and each of the 112 classes in the 3D case (R^3). They have periods 3, 4 or 6 in the 2D case; and 4, 5, 6, 8 or 10 in the 3D case. We display a selection of 3D minimal SPTs. Some of them have properties that cannot take place in the 2D case.

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