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If X is a proper CAT(-1)-space and $\Gamma$ a non-elementary discrete group of isometries acting properly discontinuously on X, it is shown that the geodesic flow on the quotient space Y=X/$\Gamma$ is topologically mixing, provided that the…

Geometric Topology · Mathematics 2018-11-28 Ch. Charitos , G. Tsapogas

We prove a Poincar\'e-Bendixson theorem describing the asymptotic behavior of geodesics for a meromorphic connection on a compact Riemann surface. We shall also briefly discuss the case of non-compact Riemann surfaces, and study in detail…

Complex Variables · Mathematics 2014-06-27 Marco Abate , Fabrizio Bianchi

Let $\Sigma$ be a closed orientable hyperbolic surface. We introduce the notion of a \textit{geodesic current with corners} on $\Sigma$, which behaves like a geodesic current away from certain singularities (the "corners"). We topologize…

Geometric Topology · Mathematics 2023-10-19 Tarik Aougab , Jayadev Athreya

In this paper, we give a new construction of the adapted complex structure on a neighborhood of the zero section in the tangent bundle of a compact, real-analytic Riemannian manifold. Motivated by the "complexifier" approach of T. Thiemann…

Symplectic Geometry · Mathematics 2012-10-19 Brian C. Hall , William D. Kirwin

For any geodesic current we associated a quasi-metric space. For a subclass of geodesic currents, called filling, it defines a metric and we study the critical exponent associated to this space. We show that is is equal to the exponential…

Metric Geometry · Mathematics 2017-04-24 Olivier Glorieux

Ratner's theorem implies topological rigidity of immersed totally geodesic subspaces of noncompact type in finite-volume locally symmetric spaces. In higher rank and infinite volume, however, counter-examples to this rigidity have remained…

Geometric Topology · Mathematics 2026-02-18 Subhadip Dey , Hee Oh

In this paper, we prove that if the geodesic flow of a complete manifold without conjugate points with sectional curvatures bounded below by $-c^2$ is of Anosov type, then the constant of contraction of the flow is $\geq e^{-c}$. Moreover,…

Dynamical Systems · Mathematics 2024-01-29 Ítalo Dowell , Sergio Romaña

Let $\Sigma$ be a compact, orientable surface of negative Euler characteristic, and let $h$ be a complete hyperbolic metric on $\Sigma$. A geodesic curve $\gamma$ in $\Sigma$ is filling, if it cuts the surface into topological disks and…

Geometric Topology · Mathematics 2020-01-03 Monika Kudlinska

In this work, we introduce the notion of entropy at infinity, and define a wide class of noncompact manifolds with negative curvature, those which admit a critical gap between entropy at infinity and topological entropy. We call them…

Dynamical Systems · Mathematics 2018-02-15 Barbara Schapira , Samuel Tapie

In [Bon88], Bonahon gave a construction of Thurston's compactification of Teichm{\"u}ller space using geodesic currents. His argument only applies in the case of closed surfaces, and there are good reasons for that. We present a variant…

General Topology · Mathematics 2023-05-24 Marie Trin

Let $(M,g)$ be a closed Riemannian manifold and $\sigma$ be a closed 2-form on $M$ representing an integer cohomology class. In this paper, using symplectic reduction, we show how the problem of existence of closed magnetic geodesics for…

Dynamical Systems · Mathematics 2017-04-07 Luca Asselle , Felix Schmäschke

For every finite collection of curves on a surface, we define an associated (semi-)norm on the first homology group of the surface. The unit ball of the dual norm is the convex hull of its integer points. We give an interpretation of these…

Geometric Topology · Mathematics 2025-11-26 Pierre Dehornoy , Marcos Cossarini

We describe a family of arithmetic cross-sections for geodesic flow on compact surfaces of constant negative curvature based on the study of generalized Bowen-Series boundary maps associated to cocompact torsion-free Fuchsian groups and…

Dynamical Systems · Mathematics 2018-09-05 Adam Abrams , Svetlana Katok

Each free homotopy class of directed closed curves on a surface with boundary can be described by a cyclic reduced word in the generators of the fundamental group and their inverses. The word length is the number of letters of the cyclic…

Geometric Topology · Mathematics 2013-05-28 Moira Chas , Keren Li , Bernard Maskit

Given a compact orientable surface of negative Euler characteristic, there exists a natural pairing between the Teichmueuller space of the surface and the set of homotopy classes of simple loops and arcs. The length pairing sends a…

Geometric Topology · Mathematics 2007-05-23 Feng Luo , Richard Stong

The main result of this article is that Hitchin representations over real closed field extensions $\mathbb{F}$ of $\mathbb{R}$ correspond precisely to those representations of the fundamental group of a closed surface into…

Geometric Topology · Mathematics 2025-04-01 Xenia Flamm

In this paper, we establish compactness for various geometric curvature energies including integral Menger curvature, and tangent-point repulsive potentials, defined a priori on the class of compact, embedded $m$-dimensional Lipschitz…

Differential Geometry · Mathematics 2015-10-05 Sławomir Kolasiński , Paweł Strzelecki , Heiko von der Mosel

We prove a quantitative estimate, with a power saving error term, for the number of simple closed geodesics of length at most $L$ on a compact surface equipped with a Riemannian metric of negative curvature. The proof relies on the…

Geometric Topology · Mathematics 2021-07-06 Alex Eskin , Maryam Mirzakhani , Amir Mohammadi

We prove a compactness theorem for holomorphic curves in 4-dimensional symplectizations that have embedded projections to the underlying 3-manifold. It strengthens the cylindrical case of the SFT compactness theorem by using intersection…

Symplectic Geometry · Mathematics 2008-03-07 Chris Wendl

Let $S$ be a closed, genus $g$ surface. The space of geodesic currents on $S$ encompasses the set of closed curves up to homotopy, as well as Teichm\"uller space, and many other spaces of structures on $S$. We show that one can define a…

Geometric Topology · Mathematics 2022-10-06 Sebastian Hensel , Jenya Sapir