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Given a number field K, we consider families of critically separable rational maps of degree d over K possessing a certain fixed-point and multiplier structure. With suitable notions of isomorphism and good reduction between rational maps…

数论 · 数学 2019-02-20 Clayton Petsche

We consider a compact orientable hyperbolic 3-manifold with a compressible boundary. Suppose that we are given a sequence of geometrically finite hyperbolic metrics whose conformal boundary structures at infinity diverge to a projective…

几何拓扑 · 数学 2011-11-28 Inkang Kim , Cyril Lecuire , Ken'ichi Ohshika

Renormalizations can be considered as building blocks of complex dynamical systems. This phenomenon has been widely studied for iterations of polynomials of one complex variable. Concerning non-polynomial hyperbolic rational maps, a recent…

动力系统 · 数学 2015-08-10 Guizhen Cui , Wenjuan Peng , Lei Tan

In 1980s, Thurston established a topological characterization theorem for postcritically finite rational maps. In this paper, a decomposition theorem for a class of postcritically infinite branched covering termed `Herman map' is developed.…

动力系统 · 数学 2012-03-27 Xiaoguang Wang

We study a family of Bowen-Series-like maps associated to any finitely generated Fuchsian group of the first kind with at least one cusp. These maps act on the boundary of the hyperbolic plane in a piecewise manner by generators of the…

动力系统 · 数学 2025-08-19 Adam Abrams , Svetlana Katok , Ilie Ugarcovici

We prove a dynamical Shafarevich theorem on the finiteness of the set of isomorphism classes of rational maps with fixed degeneracies. More precisely, fix an integer d at least 2 and let K be either a number field or the function field of a…

代数几何 · 数学 2017-05-17 Lucien Szpiro , Lloyd West

In this paper we develop a bubble tree structure for a degenerating class of Riemannian metrics satisfying some global conformal bounds on compact manifolds of dimension 4. Applying the bubble tree structure, we establish a gap theorem, a…

微分几何 · 数学 2007-05-23 Alice Chang , Jie Qing , Paul Yang

Given a semistable degeneration with a simple normal crossings central fiber, Abramovich-Chen-Gross-Siebert [3] proved a degeneration formula that relates the moduli spaces of stable maps in smooth fibers to certain moduli spaces of…

辛几何 · 数学 2020-07-20 Mohammad Farajzadeh Tehrani

We study the group of self-equivalences of a partially postcritically finite branched cover and answer a question of Adam Epstein about contractibility of certain deformation spaces of rational maps.

动力系统 · 数学 2024-01-01 Tanya Firsova , Jeremy Kahn , Nikita Selinger

We prove the existence of Cannon-Thurston maps for Kleinian groups corresponding to pared manifolds whose boundary is incompressible away from cusps. We also describe the structure of these maps in terms of ending laminations.

几何拓扑 · 数学 2016-12-30 Shubhabrata Das , Mahan Mj

By adapting the near-degenerate regime designed by Kahn, Lyubich, and D. Dudko, we prove that the boundaries of Herman rings with bounded type rotation number and of the simplest configuration are quasicircles with dilatation depending only…

动力系统 · 数学 2026-02-09 Willie Rush Lim

For $N \geq 4$ we classify the $(N-3)$-degenerate smooth CR maps of the three-dimensional unit sphere into the $(2N-1)$-dimensional unit sphere. Each of these maps has image being contained in a five-dimensional complex-linear space and is…

复变函数 · 数学 2024-04-29 Giuseppe della Sala , Bernhard Lamel , Michael Reiter , Duong Ngoc Son

We study skew-product dynamics for a large class of finitely-generated semi--hyperbolic semigroups of rational maps acting on the Riemann sphere, which generalizes both the theory of iteration of a single rational map of a single complex…

动力系统 · 数学 2022-09-27 Jason Atnip , Hiroki Sumi , Mariusz Urbański

Consider a geometrically finite Kleinian group $G$ without parabolic or elliptic elements, with its Kleinian manifold $M=(\H^3\cup \Omega_G)/G$. Suppose that for each boundary component of $M$, either a maximal and connected measured…

几何拓扑 · 数学 2008-09-09 Ken'ichi Ohshika

In this paper, we classify completely hyperbolic 3-manifolds corresponding to geometric limits of Kleinian surface groups isomorphic to $\pi_1(S)$ for a finite-type hyperbolic surface $S$. In the first of the three main theorems, we…

几何拓扑 · 数学 2015-05-22 Ken'ichi Ohshika , Teruhiko Soma

Among Thurston maps (orientation-preserving, postcritically finite branched coverings of the 2-sphere to itself), those that arise as subdivision maps of a finite subdivision rule form a special family. For such maps, we investigate…

动力系统 · 数学 2015-08-04 William J. Floyd , Walter R. Parry , Kevin M. Pilgrim

We establish the convergence theory of multiplicative Diophantine approximation for all non-degenerate, smooth manifolds. We also settle said convergence theory for all affine subspaces satisfying a highly generic and essentially optimal…

数论 · 数学 2026-02-12 Sam Chow , Rajula Srivastava , Niclas Technau , Han Yu

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

Geometrization theorem, fibered case: Every three-manifold that fibers over the circle admits a geometric decomposition. Double limit theorem: for any sequence of quasi-Fuchsian groups whose controlling pair of conformal structures tends…

几何拓扑 · 数学 2007-05-23 William P. Thurston

We consider the dynamics of rational semigroups (semigroups of rational maps) on the Riemann sphere. We provide proof that a random backward iteration algorithm to draw the pictures of the Julia sets, previously proven to work in the…

动力系统 · 数学 2013-12-06 Rich Stankewitz , Hiroki Sumi