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In this paper, the main focus is on the Sierpinski carpet Julia sets of the rational maps with non-recurrent critical points. We study the uniform quasicircle property of the peripheral circles, the relatively separated property of the…

Dynamical Systems · Mathematics 2018-03-01 Weiyuan Qiu , Fei Yang , Jinsong Zeng

We construct a new type of locally homeomorphic quasiregular mappings in the 3-sphere and discuss their relation to the M.A.Lavrentiev problem, the Zorich map with an essential singularity at infinity, the Fatou's problem and a quasiregular…

Complex Variables · Mathematics 2018-10-17 Boris N. Apanasov

In this paper we give explicit examples of bounded domains that satisfy the quasihyperbolic boundary condition and calculate the values for the constants. These domains are also John domains and we calculate John constants as well. The…

Classical Analysis and ODEs · Mathematics 2016-05-30 Petteri Harjulehto , Riku Klén

We consider a strengthening of the usual quasiconvexity condition of Morrey in two dimensions, which allows us to prove lower semicontinuity for functionals which are unbounded as the determinant vanishes. This notion, that we call…

Analysis of PDEs · Mathematics 2025-09-16 Kari Astala , Daniel Faraco , André Guerra , Aleksis Koski , Jan Kristensen

For a class of polynomial maps of one variable with a parabolic fixed points and degrees bigger than $21$, the parabolic renormalization is introduced based on Fatou coordinates and horn maps, and a type of maps which are invariant under…

Dynamical Systems · Mathematics 2022-02-28 X. Zhang

We analyze the infinitesimal effect of holomorphic perturbations of the dynamics of a structurally stable rational map on a neighborhood of its Julia set. This implies some restrictions on the behavior of critical points.

Dynamical Systems · Mathematics 2009-11-07 Artur Avila

We give a lower bound of the hyperbolic and the Hausdorff dimension of the Julia set of meromorphic functions of finite order under very general conditions.

Dynamical Systems · Mathematics 2007-05-23 Volker Mayer

In 2001 E. Ghys, X. Gomez-Mont and J. Saludes defined the Fatou and Julia components of transversely holomorphic foliations on compact manifolds. It is a partition of the manifold in two saturated sets: the Fatou set which represents the…

Dynamical Systems · Mathematics 2015-08-26 Nicolas Hussenot

In this paper, we study a partially overdetermined mixed boundary value problem in a half ball. We prove that a domain in which this partially overdetermined problem admits a solution if and only if the domain is a spherical cap…

Analysis of PDEs · Mathematics 2019-08-08 Jinyu Guo , Chao Xia

A major open question in transcendental dynamics asks if it is possible for points in a wandering domain to have bounded orbits, and more strongly, for a wandering domain to iterate only in a bounded domain. In this paper we give a partial…

Dynamical Systems · Mathematics 2023-08-01 Leticia Pardo-Simón , David J. Sixsmith

Let $U$ be a point set in the $n$-dimensional affine space ${\rm AG}(n,q)$ over the finite field of $q$ elements and $0\leq k\leq n-2$. In this paper we extend the definition of directions determined by $U$: a $k$-dimensional subspace $S_k$…

Combinatorics · Mathematics 2014-07-22 Péter Sziklai , Marcella Takáts

Let $f:\widehat{\mathbb{C}}\rightarrow \widehat{\mathbb{C}}$ be a hyperbolic rational map of degree $d \geq 2$, and let $J \subset \mathbb{C}$ be its Julia set. We prove that $J$ always has positive Fourier dimension. The case where $J$ is…

Dynamical Systems · Mathematics 2022-09-21 Gaétan Leclerc

We present a number of rigidity results concerning holomorphic dynamical systems admitting rotation quasicircles. Firstly, we show the absence of line fields on the Julia set of any rational map that is geometrically finite away from a…

Dynamical Systems · Mathematics 2025-09-05 Willie Rush Lim

We study Hausdorff limits of the external rays of a given periodic angle along a convergent sequence of polynomials of degree $d \geq 2$ with connected Julia sets.

Dynamical Systems · Mathematics 2024-12-24 Carsten Lunde Petersen , Saeed Zakeri

We show that for any quasimeromorphic mapping with an essential singularity at infinity, there exist points whose iterates tend to infinity arbitrarily slowly. This extends a result by Nicks for quasiregular mappings, and Rippon and…

Dynamical Systems · Mathematics 2021-07-01 Luke Warren

We prove that a harmonic quasiconformal mapping defined on a finitely connected domain in the plane, all of whose boundary components are either points or quasicircles, admits a quasiconformal extension to the whole plane if its Schwarzian…

Complex Variables · Mathematics 2021-02-05 Iason Efraimidis

We will consider inclusion of metric balls defined by the quasihyperbolic, the $j$-metric and the chordal metric. The quasihyperbolic metric and the $j$-metric are considered in general subdomains of $\mathbb{R}^n$ and in some particular…

Metric Geometry · Mathematics 2013-01-14 Riku Klén , Matti Vuorinen

We prove that if $\xi$ is a quasisymmetric homeomorphism between Sierpi\'nski carpets that are the Julia sets of postcritically-finite rational maps, then $\xi$ is the restriction of a M\"obius transformation to the Julia set. This implies…

Dynamical Systems · Mathematics 2014-03-04 Mario Bonk , Misha Lyubich , Sergei Merenkov

In this paper, we develop the foundations of the theory of quasiregular mappings in general metric measure spaces. In particular, nine definitions of quasiregularity for a discrete open mapping with locally bounded multiplicity are proved…

Complex Variables · Mathematics 2016-11-09 Chang-Yu Guo , Marshall Williams

In this paper we characterize $\w$-limit sets of dendritic Julia sets for quadratic maps. We use Baldwin's symbolic representation of these spaces as a non-Hausdorff itinerary space and prove that quadratic maps with dendritic Julia sets…

Dynamical Systems · Mathematics 2012-05-02 Andrew Barwell , Brian Raines