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In the Teichm\"uller space of a hyperbolic surface of finite type, we construct geodesic lines for Thurston's asymmetric metric having the property that when they are traversed in the reverse direction, they are also geodesic lines (up to…

Geometric Topology · Mathematics 2010-01-14 Athanase Papadopoulos , Guillaume Théret

In this paper, we introduce an asymmetric metric on the space of marked Euclidean triangles, and we prove several properties of this metric, including two equivalent definitions of this metric, one of them comparing ratios of functions of…

Geometric Topology · Mathematics 2025-04-25 Ismail Saglam , Ken'Ichi Ohshika , Athanase Papadopoulos

This paper develops a theory of Lipschitz comparisons of hyperbolic surfaces analogous to the theory of quasi-conformal comparisons. Extremal Lipschitz maps (minimal stretch maps) and geodesics for the `Lipschitz metric' are constructed.…

Geometric Topology · Mathematics 2007-05-23 William P. Thurston

We continue the study of the analogue of Thurston's metric on the Teichm{\"u}ller space of Euclidean triangle which was started by Saglam and Papadopoulos in [1].By direct calculation, we give explicit expressions of the distance function…

Geometric Topology · Mathematics 2023-08-28 Hideki Miyachi , Ken'Ichi Ohshika , Athanase Papadopoulos

For each right-angled hexagon in the hyperbolic plane, we construct a one-parameter family of right-angled hexagons with a Lipschitz map between any two elements in this family, realizing the smallest Lipschitz constant in the homotopy…

Geometric Topology · Mathematics 2017-01-25 Athanase Papadopoulos , Sumio Yamada

In a 1998 preprint, Bill Thurston outlined a Teichmuller theory for hyperbolic surfaces based on maps between surfaces which minimize the Lipschitz constant (minimum stretch or best Lipschitz maps). In this paper we continue the analytic…

Differential Geometry · Mathematics 2025-09-03 Georgios Daskalopoulos , Karen Uhlenbeck

We study Thurston's Lipschitz and curve metrics, as well as the arc metric on the Teichmueller space of one-hold tori equipped with complete hyperbolic metrics with boundary holonomy of fixed length. We construct natural Lipschitz maps…

Geometric Topology · Mathematics 2021-04-13 Yi Huang , Athanase Papadopoulos

For closed hyperbolic $3$-manifolds $M$ with volume less than a constant $V$, we prove an inequality regarding the geometric $L^2$-norm and the topological Thurston norm, which is qualitatively sharp and verifies a conjecture of Brock and…

Geometric Topology · Mathematics 2024-03-05 Xiaolong Hans Han

We investigate isoperimetric inequalities for Lipschitz 2-spheres in CAT(0) spaces, proving bounds on the volume of efficient null-homotopies. In one dimension lower, it is known that a quadratic inequality with a constant smaller than…

Metric Geometry · Mathematics 2025-02-06 Cornelia Druţu , Urs Lang , Panos Papasoglu , Stephan Stadler

Given two hyperbolic surfaces and a homotopy class of maps between them, Thurston proved that there always exists a representative minimizing the Lipschitz constant. While not unique, these minimizers are rigid along a geodesic lamination.…

Geometric Topology · Mathematics 2025-10-24 Aaron Calderon , Jing Tao

This paper is a survey about the Thurston metric on the Teichm\"uller space. The central issue is the constructions of extremal Lipschitz maps between hyperbolic surfaces. We review several constructions, including the original work of…

Geometric Topology · Mathematics 2023-07-11 Huiping Pan , Weixu Su

We give a simple procedure to estimate the smallest Lipshitz constant of a degree 1 map from a Riemannian 2-sphere to the unit 2-sphere, up to a factor of 10. Using this procedure, we are able to prove several inequalities involving this…

Differential Geometry · Mathematics 2007-05-23 Larry Guth

We highlight several analogies between the Finsler (infinitesimal) properties of Teichm\"uller's metric and Thurston's asymmetric metric on Teichm\"uller space. Thurston defined his asymmetric metric in analogy with Teichm\"ullers' metric,…

Geometric Topology · Mathematics 2011-11-18 Athanase Papadopoulos , Weixu Su

In his seminal work on Teichm\"uller spaces (\cite{Th98}), Thurston introduced the maximal stretch for a pair of hyperbolic metrics on a closed surface of genus $\geq 2$ and showed that the logarithm of this quantity induces an asymmetric…

Differential Geometry · Mathematics 2026-05-27 Xian Dai , Gerhard Knieper

Considering the Teichm\"uller space of a surface equipped with Thurston's Lipschitz metric, we study geodesic segments whose endpoints have bounded combinatorics. We show that these geodesics are cobounded, and that the closest-point…

Geometric Topology · Mathematics 2011-09-15 Anna Lenzhen , Kasra Rafi , Jing Tao

In his paper Minimal stretch maps between hyperbolic surfaces, William Thurston defined a norm on the tangent space to Teichm{\"u}ller space of a hyperbolic surface, which he called the earthquake norm. This norm is obtained by assigning a…

Complex Variables · Mathematics 2026-03-24 Hideki Miyachi , Ken'Ichi Ohshika , Athanase Papadopoulos

We exhibit the duality between best Lipschitz (infinity harmonic) maps and least gradient maps in the case of maps from surfaces to the circle. We show that given a homotopy class of a map from a surface to the circle the infinity harmonic…

Differential Geometry · Mathematics 2022-05-05 Georgios Daskalopoulos , Karen Uhlenbeck

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

We show that the nearest point retraction is a uniform quasi-isometry from the Thurston metric on a hyperbolic domain in the Riemann sphere to the boundary of the convex hull of its complement. As a corollary, one obtains explicit bounds on…

Geometric Topology · Mathematics 2010-10-05 Martin Bridgeman , Richard Canary

The goal of this paper is to introduce and study analogues of the Euclidean Funk and Hilbert metrics on open convex subsets $\Omega$ of hyperbolic or spherical spaces. At least at a formal level, there are striking similarities among the…

Geometric Topology · Mathematics 2012-09-20 Athanase Papadopoulos , Sumio Yamada
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