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Via taking connected components of preimages, a Thurston map $f: (S^2, P_f) \to (S^2, P_f)$ induces a pullback relation on the set of isotopy classes of curves in the complement of its postcritical set $P_f$. We survey known results about…

Dynamical Systems · Mathematics 2021-02-25 Kevin M. Pilgrim

We introduce a large scale analogue of the classical fixed-point property for continuous maps, which shall apply to coarse maps. We also develop a coarse version of degree for coarse maps on Euclidean spaces. Then, applying a coarse…

Algebraic Topology · Mathematics 2010-08-31 Steven Hair

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

We study rational self-maps of $\mathbb{P}^{1}$ whose critical points all have finite forward orbit. Thurston's rigidity theorem states that outside a single well-understood family, there are finitely many such maps over $\mathbb{C}$ of…

Algebraic Geometry · Mathematics 2012-12-03 Alon Levy

We study canonical decompositions of postcritically finite branched coverings of the 2-sphere, as defined by K. Pilgrim. We show that every hyperbolic cycle in the decomposition does not have a Thurston obstruction. It is thus Thurston…

Dynamical Systems · Mathematics 2012-05-03 Sylvain Bonnot , Michael Yampolsky

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

A Thurston map is a branched covering map from $\S^2$ to $\S^2$ with a finite postcritical set. We associate a natural Gromov hyperbolic graph $\G=\G(f,\mathcal C)$ with an expanding Thurston map $f$ and a Jordan curve $\mathcal C$ on…

Dynamical Systems · Mathematics 2014-02-14 Qian Yin

A Thurston map is a branched covering map $f\colon S^2\to S^2$ that is postcritically finite. Mating of polynomials, introduced by Douady and Hubbard, is a method to geometrically combine the Julia sets of two polynomials (and their…

Complex Variables · Mathematics 2012-10-23 Daniel Meyer

We prove the No Invariant Line Fields conjecture for a class of generalized postcritically-finite branched covers on higher-dimensional Riemannian manifolds. Moreover, we establish a quasisymmetric uniformization theorem for this class of…

Dynamical Systems · Mathematics 2025-12-16 Zhiqiang Li , Pekka Pankka , Hanyun Zheng

We study canonical decompositions of postcritically finite branched coverings of the 2-sphere, as defined by K.~Pilgrim. We show that every hyperbolic cycle in the decomposition does not have a Thurston obstruction. It is thus Thurston…

Dynamical Systems · Mathematics 2010-11-18 Sylvain Bonnot , Michael Yampolsky

The dynamical classification of rational maps is a central concern of holomorphic dynamics. Much progress has been made, especially on the classification of polynomials and some approachable one-parameter families of rational maps; the goal…

Dynamical Systems · Mathematics 2022-01-10 Russell Lodge , Yauhen Mikulich , Dierk Schleicher

We show that the Nielsen-Thurston classification of mapping classes of the sphere with four marked points is determined by the quantum SU(n)-representations, for any fixed integer $n \geq 2$. In the Pseudo-Anosov case we also show that the…

Geometric Topology · Mathematics 2007-05-23 Jorgen Ellegaard Andersen , Gregor Masbaum , Kenji Ueno

We study the possibility of a continuous extension of a class of mappings to an isolated point on the boundary of a domain. We show that if some characteristic of this mapping is integrable on almost all spheres in the neighborhood of at…

Complex Variables · Mathematics 2025-11-04 Victoria Desyatka , Evgeny Sevost'yanov

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

We demonstrate that the question whether or not a given postcritically finite topological ramified covering map of the 2-sphere is Thurston equivalent to a rational map is algorithmically decidable.

Dynamical Systems · Mathematics 2010-09-30 Sylvain Bonnot , Mark Braverman , Michael Yampolsky

We consider Thurston maps, i.e., branched covering maps $f\colon S^2\to S^2$ that are postcritically finite. In addition, we assume that $f$ is expanding in a suitable sense. It is shown that each sufficiently high iterate $F=f^n$ of $f$ is…

Complex Variables · Mathematics 2013-04-10 Daniel Meyer

Let $\phi$ be a post-critically finite branched covering of a two-sphere. By work of Koch, the Thurston pullback map induced by $\phi$ on Teichm\"{u}ller space descends to a multi-valued self-map --- a Hurwitz correspondence…

Algebraic Geometry · Mathematics 2020-06-10 Rohini Ramadas

In the second paper [LZ24b] of this series, we obtained an analog of the prime number theorem for a class of branched covering maps on the $2$-sphere $S^2$ called expanding Thurston maps, which are topological models of some non-uniformly…

Dynamical Systems · Mathematics 2024-12-31 Zhiqiang Li , Tianyi Zheng

In this paper, we use new results together with established facts about Thurston's compactification of Teichm\"uller space to address the geometric P=W conjecture for $\mathrm{SL}(2,\mathbb{C})$, which concerns projective compactifications…

Geometric Topology · Mathematics 2026-02-03 Ashwin Ayilliath-Kutteri , Mohammad Farajzadeh-Tehrani , Charles Frohman

This paper shows that there is a mapping class group-equivariant deformation retraction of the Teichm\"uller space of a closed, orientable surface onto a cell complex of dimension equal to the virtual cohomological dimension of the mapping…

Geometric Topology · Mathematics 2025-08-06 Ingrid Irmer