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We give bounds on the number of non-simple closed curves on a negatively curved surface, given upper bounds on both length and self-intersection number. In particular, it was previously known that the number of all closed curves of length…

Geometric Topology · Mathematics 2017-02-21 Jenya Sapir

This article explores closed geodesics on hyperbolic surfaces. We show that, for sufficiently large $k$, the shortest closed geodesics with at least $k$ self-intersections, taken among all hyperbolic surfaces, all lie on an ideal pair of…

Geometric Topology · Mathematics 2022-11-16 Ara Basmajian , Hugo Parlier , Hanh Vo

We study the relationship between the lengths of closed geodesics on hyperbolic surfaces and their topological complexity, measured by the self-intersection number. In particular, we provide explicit upper bounds for the length $s_k(X)$ of…

Geometric Topology · Mathematics 2025-12-01 Changjie Chen

We prove that the minimal length of a closed geodesic with self-intersection number $k$ on any finite-type hyperbolic surface is $2\cosh^{-1}(1+2k)$ for $k>1750$. This improves the previously known threshold $k > 10^{13350}$. Our proof is…

Geometric Topology · Mathematics 2025-08-05 Wujie Shen

Our main point of focus is the set of closed geodesics on hyperbolic surfaces. For any fixed integer $k$, we are interested in the set of all closed geodesics with at least $k$ (but possibly more) self-intersections. Among these, we…

Geometric Topology · Mathematics 2016-09-02 Viveka Erlandsson , Hugo Parlier

We study closed geodesics on hyperbolic surfaces, and give bounds for their angles of intersection and self-intersection, and for the sides of the polygons that they form, depending only on the lengths of the geodesics

Geometric Topology · Mathematics 2019-05-28 Max Neumann-Coto , Peter Scott

In this paper1 , we use the coding developed by R. Bowen and C. Series to compute the number of self-intersections of a closed geodesic on a pair of pants. We give lower and upper bounds on the number of self-intersections of a closed…

Geometric Topology · Mathematics 2021-08-17 Diop. ElHadji Abdou Aziz , Gaye. Masseye

In the present paper, we show that the minimal length of closed geodesics on finite-type hyperbolic surfaces with self-intersection number $k$ has order $2\log k$ as $k$ gets large.

Geometric Topology · Mathematics 2022-07-19 Wujie Shen , Jiajun Wang

On a hyperbolic Riemann surface, given two simple closed geodesics that intersect $n$ times, we address the question of a sharp lower bound $L_n$ on the length attained by the longest of the two geodesics. We show the existence of a surface…

Differential Geometry · Mathematics 2007-05-23 Thomas Gauglhofer , Hugo Parlier

This article deals with the set of closed geodesics on complete finite type hyperbolic surfaces. For any non-negative integer $k$, we consider the set of closed geodesics that self-intersect at least $k$ times, and investigate those of…

Geometric Topology · Mathematics 2019-12-23 Thi Hanh Vo

We study the order of lengths of closed geodesics on hyperbolic surfaces. Our first main result is that the order of lengths of curves determine a point in Teichm\"uller space. In an opposite direction, we identify classes of curves whose…

Geometric Topology · Mathematics 2025-06-10 Hugo Parlier , Hanh Vo , Binbin Xu

We prove that, if a closed geodesic $\Gamma$ on a complete finite type hyperbolic surface has at least 2 self-intersections, then the length of $\Gamma$ has an lower bound $2\log(5+2\sqrt6)$, and the lower bound is sharp, attained on a…

Geometric Topology · Mathematics 2025-10-02 Wujie Shen

The mapping class group of a surface $\S$ acts on the set of closed geodesics on $\S$. This action preserves self-intersection number. In this paper, we count the orbits of curves with at most $K$ self-intersections, for each $K \geq 1$.…

Geometric Topology · Mathematics 2016-07-20 Jenya Sapir

On a closed Riemannian surface of negative curvature, we prove a characterization for configurations of closed geodesics arising from one parameter Allen-Cahn min-max constructions. One of the facts we conclude is that every geodesic occurs…

Differential Geometry · Mathematics 2025-03-20 Vanderson Lima

This note is about a type of quantitative density of closed geodesics on closed hyperbolic surfaces. The main results are upper bounds on the length of the shortest closed geodesic that $\varepsilon$-fills the surface.

Geometric Topology · Mathematics 2017-05-31 Ara Basmajian , Hugo Parlier , Juan Souto

In this paper, we obtain upper bounds on the multiplicity of Laplacian eigenvalues for closed hyperbolic surfaces in terms of the number of short closed geodesics and the genus $g$. For example, we show that if the number of short closed…

Differential Geometry · Mathematics 2025-12-03 Xiang He , Yunhui Wu , Haohao Zhang

We show that the number of simple closed geodesics of length bounded by L on a hyperbolic surface of genus g with c cusps and b boundary components grows roughly like L^{6g+2b+2c-6}. This has been conjectured for some time.

Geometric Topology · Mathematics 2007-05-23 Igor Rivin

For an oriented surface $S$, the singular set of a fold map $f:S\rightarrow \mathbb{R}^2$ is a collection of smooth curves, also known as fold singularities. We construct a sharp lower bound on the number of self-intersections of such fold…

Geometric Topology · Mathematics 2026-05-14 Joshua Drouin , Liam Kahmeyer

In this note, we develop a condition on a closed curve on a surface or in a 3-manifold that implies that the curve has the property that its length function on the space of all hyperbolic structures on the surface or 3-manifold completely…

Geometric Topology · Mathematics 2015-05-05 James W. Anderson

We give an exponential upper and a quadratic lower bound on the number of pairwise non-isotopic simple closed curves can be placed on a closed surface of genus g such that any two of the curves intersects at most once. Although the gap is…

Geometric Topology · Mathematics 2013-01-04 Justin Malestein , Igor Rivin , Louis Theran
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