# American Institute of Mathematical Sciences

July  2011, 29(3): 893-908. doi: 10.3934/dcds.2011.29.893

## Billiards in ideal hyperbolic polygons

 1 Department of Math. Sciences, Durham University, Durham DH1 3LE, United Kingdom 2 Technische Universität Dortmund, Fakultät für Mathematik, 44221 Dortmund, Germany

Received  November 2009 Revised  June 2010 Published  November 2010

We consider billiard trajectories in ideal hyperbolic polygons and present a conjecture about the minimality of the average length of cyclically related billiard trajectories in regular hyperbolic polygons. We prove this conjecture in particular cases, using geometric and algebraic methods from hyperbolic geometry.
Citation: Simon Castle, Norbert Peyerimhoff, Karl Friedrich Siburg. Billiards in ideal hyperbolic polygons. Discrete & Continuous Dynamical Systems - A, 2011, 29 (3) : 893-908. doi: 10.3934/dcds.2011.29.893
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##### References:
 [1] H. Ahmedov, Casimir effect in hyperbolic polygons,, J. Phys. A, 40 (2007), 10611. doi: 10.1088/1751-8113/40/34/016. Google Scholar [2] J. W. Anderson, "Hyperbolic Geometry,", Second edition, (2005). Google Scholar [3] E. Artin, Ein mechanisches System mit quasiergodischen Bahnen,, Hamburger Mathematische Abhandlungen, 3 (1924), 170. doi: 10.1007/BF02954622. Google Scholar [4] M. Bauer and A. Lopes, A billiard in the hyperbolic plane with decay of correlation of type $n^{-2}$,, Discrete Contin. Dynam. Systems, 3 (1997), 107. Google Scholar [5] A. F. Beardon, "The Geometry of Discrete Groups,", Graduate Texts in Mathematics, 91 (1983). Google Scholar [6] P. Buser, "Geometry and Spectra of Compact Riemann Surfaces,", Progress in Mathematics, 106 (1992). Google Scholar [7] T. Damour, M. Henneaux and H. Nicolai, Cosmological billiards,, Classical Quantum Gravity, 20 (2003). doi: 10.1088/0264-9381/20/9/201. Google Scholar [8] V. Dragović, B. Jovanović and M. Radnović, On elliptic billiards in the Lobachevsky space and associated geodesic hierarchies,, J. Geom. Phys., 47 (2003), 221. doi: 10.1016/S0393-0440(02)00219-X. Google Scholar [9] C. Foltin, Billiards with positive topological entropy,, Nonlinearity, 15 (2002), 2053. doi: 10.1088/0951-7715/15/6/314. Google Scholar [10] M.-J. Giannoni and D. Ullmo, Coding chaotic billiards. I. Noncompact billiards on a negative curvature manifold,, Phys. D, 41 (1990), 371. doi: 10.1016/0167-2789(90)90005-A. Google Scholar [11] M.-J. Giannoni and D. Ullmo, Coding chaotic billiards. II. Compact billiards defined on the pseudosphere,, Phys. D., 84 (1995), 329. doi: 10.1016/0167-2789(95)00064-B. Google Scholar [12] Ch. Grosche, Energy fluctuation analysis in integrable billiards in hyperbolic geometry,, in, (1999), 269. Google Scholar [13] B. Gutkin, U. Smilansky and E. Gutkin, Hyperbolic billiards on surfaces of constant curvature,, Commun. Math. Phys., 208 (1999), 65. doi: 10.1007/s002200050748. Google Scholar [14] E. Gutkin and S. Tabachnikov, Complexity of piecewise convex transfomrationen to polygonal billiards on surfaces of constant curvature,, Mosc. Math. J., 6 (2006), 673. Google Scholar [15] M. Gutzwiller, "Chaos in Classical and Quantum Mechanics,", Interdisciplinary Applied Mathematics, 1 (1990). Google Scholar [16] J. Hadamard, Les surfaces à courbures opposées et leurs lignes géodesicques,, J. Math. Pures App. (5), 4 (1898), 27. Google Scholar [17] L. Karp and N. Peyerimhoff, Extremal properties of the principal Dirichlet eigenvalue for regular polygons in the hyperbolic plane,, Arch. Math. (Basel), 79 (2002), 223. Google Scholar [18] S. Katok and I. Ugarcovici, Symbolic dynamics for the modular surface and beyond,, Bull. Amer. Math. Soc. (N.S.), 44 (2007), 87. Google Scholar [19] C. W. Misner, The mixmaster cosmological metrics,, in, 332 (1994), 317. Google Scholar [20] Ch. Schmit, "Quantum and Classical Properties of Some Billiards on the Hyperbolic Plane,", Chaos et physique quantique (Les Houches, (1991), 331. Google Scholar [21] C. Series, The modular surface and continued fractions,, J. London Math. Soc. (2), 31 (1985), 69. doi: 10.1112/jlms/s2-31.1.69. Google Scholar [22] S. Tabachnikov, A proof of Culter's theorem on the existence of periodic orbits in polygonal outer billiards,, Geom. Dedicata, 129 (2007), 83. doi: 10.1007/s10711-007-9196-y. Google Scholar [23] S. Tabachnikov and F. Dogru, Dual billiards,, Math. Intelligencer, 27 (2005), 18. doi: 10.1007/BF02985854. Google Scholar [24] A. Veselov, Confocal surfaces and integrable billiards on the sphere and in the Lobachevsky space,, J. Geom. Phys., 7 (1990), 81. doi: 10.1016/0393-0440(90)90021-T. Google Scholar
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