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We prove several new results on the combinatorial structures of the unit spheres of the norms induced by Thurston's metric on the tangent and cotangent spaces of the Teichm{\"u}ller space of a closed surface of negative Euler…

几何拓扑 · 数学 2026-05-27 Ken'Ichi Ohshika , Athanase Papadopoulos

We undertake a systematic study of the infinitesimal geometry of the Thurston metric, showing that the topology, convex geometry and metric geometry of the tangent and cotangent spheres based at any marked hyperbolic surface representing a…

几何拓扑 · 数学 2024-01-10 Yi Huang , Ken'Ichi Ohshika , Athanase Papadopoulos

Thurston's boundary to the universal Teichm\"uller space $T(\mathbb{D})$ is the space $PML_{bdd}(\mathbb{D})$ of projective bounded measured laminations of $\mathbb{D}$. A geodesic ray in $T(\mathbb{D})$ is of Teichm\"uller type if it…

几何拓扑 · 数学 2015-05-29 Hrant Hakobyan , Dragomir Saric

For the Thurston (asymmetric) metric on Teichm\"uller space, the defect from being uniquely geodesic is described by the envelope, defined as the union of geodesics from the initial point to the terminal point. Using the harmonic stretch…

几何拓扑 · 数学 2026-01-22 Huiping Pan , Michael Wolf

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…

几何拓扑 · 数学 2023-08-28 Hideki Miyachi , Ken'Ichi Ohshika , Athanase Papadopoulos

Given a sequence of curves on a surface, we provide conditions which ensure that (1) the sequence is an infinite quasi-geodesic in the curve complex, (2) the limit in the Gromov boundary is represented by a nonuniquely ergodic ending…

几何拓扑 · 数学 2017-02-21 Jeffrey Brock , Christopher Leininger , Babak Modami , Kasra Rafi

In this paper, we show that the analogue of Thurston's asymmetric metric on the Teichm{\"u}ller space of flat structures on the torus is weak Finsler and we give a geometric description of its unit sphere at each point in the tangent space…

复变函数 · 数学 2021-09-07 Hideki Miyachi , Ken'Ichi Ohshika , Athanase Papadopoulos

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…

几何拓扑 · 数学 2011-09-15 Anna Lenzhen , Kasra Rafi , Jing Tao

Let $X$ be an infinite geodesically complete hyperbolic surface which can be decomposed into geodesic pairs of pants. We introduce Thurston's boundary to the Teichm\"uller space $T(X)$ of the surface $X$ using the length spectrum analogous…

几何拓扑 · 数学 2015-05-26 Dragomir Saric

We show that the length function of a measured geodesic lamination is convex in Thurston's shear coordinates over Teichm\"uller space and strictly convex for generic laminations. We give some consequences of this result in the context of…

几何拓扑 · 数学 2014-08-26 Guillaume Théret

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…

微分几何 · 数学 2026-05-27 Xian Dai , Gerhard Knieper

In this article we study convexity properties of distance functions in infinite dimensional Finsler unitary groups, such as the full unitary group, the unitary Schatten perturbations of the identity and unitary groups of finite von Neumann…

算子代数 · 数学 2022-09-23 Martin Miglioli

We study the geometry of hyperbolic cone surfaces, possibly with cusps or geodesic boundaries. We prove that any hyperbolic cone structure on a surface of non-exceptional type is determined up to isotopy by the geodesic lengths of a finite…

几何拓扑 · 数学 2017-03-07 Huiping Pan

We study the geometry of the Thurston metric on the Teichm\"uller space $\mathcal{T}(S)$ of hyperbolic structures on a surface $S$. Some of our results on the coarse geometry of this metric apply to arbitrary surfaces $S$ of finite type;…

几何拓扑 · 数学 2020-05-27 David Dumas , Anna Lenzhen , Kasra Rafi , Jing Tao

In the first part of this work we explore the geometry of infinite type surfaces and the relationship between its convex core and space of ends. In particular, we show that a geodesically complete hyperbolic surface is made up of its convex…

几何拓扑 · 数学 2019-02-20 Ara Basmajian , Dragomir Saric

In this paper we show how some metric properties of the unit sphere of a normed space can help to approach a solution to Tingley's problem. In our main result we show that if an onto isometry between the spheres of strictly convex spaces is…

度量几何 · 数学 2024-02-09 Javier Cabello Sánchez

We show that Thurston's skinning maps of Teichmuller space have finite fibers. The proof centers around a study of two subvarieties of the SL_2(C) character variety of a surface, one associated to complex projective structures and the other…

几何拓扑 · 数学 2015-06-29 David Dumas

We show that every auto-homeomorphism of the unmeasured lamination space of an orientable surface of finite type is induced by a unique extended mapping class unless the surface is a sphere with at most four punctures or a torus with at…

几何拓扑 · 数学 2011-12-30 Ken'ichi Ohshika

The Thurston metric on Teichmuller space, first introduced by W. P. Thurston is an asymmetric metric on Teichmuller space defined by $d_{Th}(X,Y) = \frac12 log\sup_{\alpha} \frac{l_{\alpha}(Y)}{l_{\alpha}(X)}$. This metric is geodesic, but…

几何拓扑 · 数学 2023-11-08 Assaf Bar-Natan

Thurston's boundary to the universal Teichm\"uller space $T(\mathbb{H})$ is the set of asymptotic rays to the embedding of $T(\mathbb{H})$ in the space of geodesic currents; the boundary is identified with the projective bounded measured…

复变函数 · 数学 2018-04-11 Hrant Hakobyan , Dragomir Saric
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