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We investigate the dynamics of semigroups generated by a family of polynomial maps on the Riemann sphere such that the postcritical set in the complex plane is bounded. Moreover, we investigate the associated random dynamics of polynomials.…

Dynamical Systems · Mathematics 2007-11-26 Hiroki Sumi

We investigate the dynamics of polynomial semigroups (semigroups generated by a family of polynomial maps on the Riemann sphere) and the random dynamics of polynomials on the Riemann sphere. Combining the dynamics of semigroups and the…

Dynamical Systems · Mathematics 2011-01-20 Hiroki Sumi

We investigate the dynamics of semigroups generated by a family of polynomial maps on the Riemann sphere such that the postcritical set in the complex plane is bounded. The Julia set of such a semigroup may not be connected in general. We…

Dynamical Systems · Mathematics 2011-01-20 Hiroki Sumi

We discuss the dynamic and structural properties of polynomial semigroups, a natural extension of iteration theory to random (walk) dynamics, where the semigroup $G$ of complex polynomials (under the operation of composition of functions)…

Dynamical Systems · Mathematics 2011-05-11 Rich Stankewitz , Hiroki Sumi

We consider fiber-preserving complex dynamics on fiber bundles whose fibers are Riemann spheres and whose base spaces are compact metric spaces. In this context, without any assumption on (semi-)hyperbolicity, we show that the fiberwise…

Dynamical Systems · Mathematics 2007-05-23 Hiroki Sumi

We investigate the dynamics of $2$-generator semigroups of polynomials with bounded planar postcritical set and associated random dynamics on the Riemann sphere. Also, we investigate the space ${\cal B}$ of such semigroups. We show that for…

Dynamical Systems · Mathematics 2016-01-07 Hiroki Sumi

We investigate the random dynamics of polynomial maps on the Riemann sphere and the dynamics of semigroups of polynomial maps on the Riemann sphere. In particular, the dynamics of a semigroup $G$ of polynomials whose planar postcritical set…

Dynamical Systems · Mathematics 2015-03-16 Hiroki Sumi

We realize a dynamical decomposition for a post-critically finite rational map which admits a combinatorial decomposition. We split the Riemann sphere into two completely invariant subsets. One is a subset of the Julia set consisting of…

Dynamical Systems · Mathematics 2015-07-17 Guizhen Cui , Wenjuan Peng , Lei Tan

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…

Dynamical Systems · Mathematics 2022-09-27 Jason Atnip , Hiroki Sumi , Mariusz Urbański

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…

Dynamical Systems · Mathematics 2013-12-06 Rich Stankewitz , Hiroki Sumi

In this work, we study the non-autonomous dynamics generated by random iterations of the cubic family of the form $z^3 + cz$. The parameter sequence is chosen randomly from a bounded Borel subset of $\mathbb{C}$. We investigate topological…

We investigate the dynamics of semigroups of rational maps on the Riemann sphere. To establish a fractal theory of the Julia sets of infinitely generated semigroups of rational maps, we introduce a new class of semigroups which we call…

Dynamical Systems · Mathematics 2017-02-28 Johannes Jaerisch , Hiroki Sumi

For a hyperbolic polynomial automorphism of C^2 with a disconnected Julia set, and under a mild dissipativity condition, we give a topological description of the components of the Julia set. Namely, there are finitely many "quasi-solenoids"…

Dynamical Systems · Mathematics 2023-09-26 Romain Dujardin , Mikhail Lyubich

In recent years, there has been significant progress in the understanding of the dynamics of transcendental entire functions with bounded postsingular set. In particular, for certain classes of such functions, a complete description of…

Dynamical Systems · Mathematics 2022-06-14 Leticia Pardo-Simón

We give an example of two rational functions with non-equal Julia sets that generate a rational semigroup whose completely invariant Julia set is a closed line segment. We also give an example of polynomials with unequal Julia sets that…

Dynamical Systems · Mathematics 2007-08-28 Rich Stankewitz , Toshiyuki Sugawa , Hiroki Sumi

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

In this article, we investigate the boundary of the escaping set I(f) for quasiregular mappings on R^n, both in the uniformly quasiregular case and in the polynomial type case. The aim is to show that the boundary of I(f) is the Julia set…

Complex Variables · Mathematics 2009-09-02 Alastair Fletcher , Daniel A. Nicks

A small perturbation of a quadratic polynomial with a non-repelling fixed point gives a polynomial with an attracting fixed point and a Jordan curve Julia set, on which the perturbed polynomial acts like angle doubling. However, there are…

Dynamical Systems · Mathematics 2016-02-01 Alexander Blokh , Lex Oversteegen , Ross Ptacek , Vladlen Timorin

We consider the dynamics of semi-hyperbolic semigroups generated by finitely many rational maps on the Riemann sphere. Assuming that the nice open set condition holds it is proved that there exists a geometric measure on the Julia set with…

Dynamical Systems · Mathematics 2011-02-16 Hiroki Sumi , Mariusz Urbanski

It is known that the disconnected Julia set of any polynomial map does not contain buried Julia components. But such Julia components may arise for rational maps. The first example is due to Curtis T. McMullen who provided a family of…

Dynamical Systems · Mathematics 2015-08-05 Sébastien Godillon
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