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We study flat metrics arising from right regular $n$-prisms by viewing them as $n$-differentials and analyzing their associated unfoldings. We show that the unfolding of a right regular $n$-prism is never a lattice surface unless $n=4$, in…

Geometric Topology · Mathematics 2026-05-11 Xun Gong , Zuo Lin , Anthony Sanchez

Rational polygonal billiards are one of the key models among the larger class of pseudo-integrable billiards. Their billiard flow may be lifted to the geodesic flow on a translation surface. Whereas such classical billiards have been much…

Mathematical Physics · Physics 2018-12-21 Omer Friedland , Henrik Ueberschaer

We consider algebraic geometrical properties of the integrable billiard on a quadric Q with elastic impacts along another quadric confocal to Q. These properties are in sharp contrast with those of the ellipsoidal Birkhoff billiards.…

Exactly Solvable and Integrable Systems · Physics 2009-02-26 Simonetta Abenda , Yuri N. Fedorov

We prove that every indefinite quadratic form with non-negative integer coefficients is the volume polynomial of a pair of lattice polygons. This solves the discrete version of the Heine-Shephard problem for two bodies in the plane. As an…

Algebraic Geometry · Mathematics 2024-10-16 Ivan Soprunov , Jenya Soprunova

In 1999, Pitman and Stanley introduced the polytope bearing their name along with a study of its faces, lattice points, and volume. The Pitman-Stanley polytope is well-studied due to its connections to probability, parking functions, the…

Combinatorics · Mathematics 2025-07-09 William T. Dugan , Maura Hegarty , Alejandro H. Morales , Annie Raymond

We consider a geodesic billiard system consisting of a complete Riemannian manifold and an obstacle submanifold with boundary at which the trajectories of the geodesic flow experience specular reflections. We show that if the geodesic…

Dynamical Systems · Mathematics 2022-06-09 Benjamin Delarue , Philipp Schütte , Tobias Weich

From a geometric viewpoint, billiard trajectories and geodesics are related by mutual approximation results. In one direction, it is known that every geodesic curve in the boundary of a smooth convex body can be approximated by a sequence…

Differential Geometry · Mathematics 2026-02-04 Daniele Giannetto

We establish sufficient conditions for the hyperbolicity of the billiard dynamics on surfaces of constant curvature. This extends known results for planar billiards. Using these conditions, we construct large classes of billiard tables with…

chao-dyn · Physics 2009-10-31 B. Gutkin , U. Smilansky , E. Gutkin

The study of polygonal billiards, particularly those in the regular pentagon, has been the subject of two recent papers. One of these papers approaches the problem of discovering the periodic trajectories on the pentagon by identifying…

We explicitly compute the limiting gap distribution for slopes of saddle connections on the flat surface associated to the regular octagon with opposite sides identified. This is the first such computation where the Veech group of the…

Geometric Topology · Mathematics 2019-07-17 Caglar Uyanik , Grace Work

The billiard problem of statistical physics is considered in a new geometric approach with a symmetric phase space. The structure and topological features of typical billiard phase portrait are defined. The connection between geometric,…

Chaotic Dynamics · Physics 2007-05-23 Sergey V. Naydenov , Vladimir V. Yanovsky

Flat surfaces that correspond to meromorphic $1$-forms or to meromorphic quadratic differentials containing poles of order two and higher are surfaces of infinite area. We classify groups that appear as Veech groups of translation surfaces…

Geometric Topology · Mathematics 2017-12-29 Guillaume Tahar

We describe Veech groups of flat surfaces arising from irrational angled polygonal billiards or irreducible stable abelian differentials. For irrational polygonal billiards, we prove that these groups are non-discrete subgroups of SO(2,R)…

Dynamical Systems · Mathematics 2009-06-29 Ferran Valdez

We consider exact solutions to the problem of ballistic aggregation in a flow of adhesive particles, providing a model for large-scale structure formation in cosmology within the framework of the Zel'dovich approximation. Two different…

Pattern Formation and Solitons · Physics 2007-07-19 A. Andrievskii , S. Gurbatov , A. Sobolevskii

We consider magnetic billiards under a strong constant magnetic field. The purpose of this paper is two-folded. We examine the question of existence of polynomial integral of billiard magnetic flow. We succeed to reduce this question to…

Dynamical Systems · Mathematics 2020-06-24 Misha Bialy , Andrey E. Mironov , Lior Shalom

We consider a notion of relative homology (and cohomology) for surfaces with two types of boundaries. Using this tool, we study a generalization of Kitaev's code based on surfaces with mixed boundaries. This construction includes both…

Quantum Physics · Physics 2016-06-24 Nicolas Delfosse , Pavithran Iyer , David Poulin

We settle a conjecture of B\'ona regarding the log-concavity of a certain statistic on parking functions by utilizing recent log-concavity results on matroids. This result allows us to also prove that connected, labeled graphs graded by…

Combinatorics · Mathematics 2024-12-30 Joseph Pappe

One of the simplest models used in studying the dynamics of large-scale structure in cosmology, known as the Zeldovich approximation, is equivalent to the three-dimensional inviscid Burgers equation for potential flow. For smooth initial…

Analysis of PDEs · Mathematics 2015-06-03 Uriel Frisch , Olga Podvigina , Barbara Villone , Vladislav Zheligovsky

We consider 2-surfaces arising from the Korteweg de Vries (KdV) equation. The surfaces corresponding to KdV are in a three dimensional Minkowski space. They contain a family of quadratic Weingarten and Willmore-like surfaces. We show that a…

Exactly Solvable and Integrable Systems · Physics 2007-05-23 Metin Gurses , Suleyman Tek

We characterize fundamental domains of affine reflection groups as those polyhedral convex bodies which support a continuous billiard dynamics. We interpret this characterization in the broader context of Alexandrov geometry and prove an…

Differential Geometry · Mathematics 2023-01-06 Christian Lange