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Hyperbolic billiards on polytopes with contracting reflection laws

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  • We study billiards on polytopes in ${\mathbb{R}^d} $ with contracting reflection laws, i.e. non-standard reflection laws that contract the reflection angle towards the normal. We prove that billiards on generic polytopes are uniformly hyperbolic provided there exists a positive integer $k$ such that for any $k$ consecutive collisions, the corresponding normals of the faces of the polytope where the collisions took place generate ${\mathbb{R}^d} $. As an application of our main result we prove that billiards on generic polytopes are uniformly hyperbolic if either the contracting reflection law is sufficiently close to the specular or the polytope is obtuse. Finally, we study in detail the billiard on a family of $3$-dimensional simplexes.

    Mathematics Subject Classification: Primary: 37D50, 37D20; Secondary: 37D45.


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  • Figure 1.  Barycentric angle $\phi$.

    Figure 2.  Composition of the projections $P_{{v'}^ \perp}\circ P_{v,\eta^ \perp}$

    Figure 3.  Parameter regions with uniform bounded escaping time

    Figure 4.   

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