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Kohei Ueno

Publications and source records attributed to Kohei Ueno.

8 recordsLinked to original sources
arXiv2024

Newton polygons and Böttcher coordinates near infinity for polynomial skew products

Let $f(z,w)=(p(z),q(z,w))$ be a polynomial skew product such that the degrees of $p$ and $q$ are grater than or equal to $2$. Under one or two conditions, we prove that $f$ is conjugate to a monomial map on an invariant region near infinity. The monomial map and the region are determined by the degree of $p$ and a Newton polygon of $q$. Moreover, the region is included in the attracting basin of a superattracting fixed or indeterminacy point at infinity, or in the closure of the attracting basins of two point at infinity.

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arXiv2023

Attraction rates for iterates of a superattracting skew product

Let $f(z,w)=(p(z),q(z,w))$ be a holomorphic skew product with a superattracting fixed point at the origin. In the previous paper we have succeeded to specify a dominant term of $q$ by the order of $p$ and the Newton polygon of $q$ and to construct a Böttcher coordinate on an invariant wedge. By using the same idea and terminologies, we give inequalities of attraction rates for the vertical dynamics of $f$ in this paper. The results hold not only for the superattracting case, but for all the other cases.

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arXiv2023

Dynamics of superattracting skew products on the attracting basins: Böttcher coordinates and plurisubharmonic functions

We study the dynamics of a superattracting skew product $f$ on the attracting basin. As the first strategy, we find out forward $f$-invariant wedge-shaped regions in the basin, on some of which $f$ is conjugate to monomial maps, and consider whether the unions of all the preimages of the regions coincide with the basin. As the second strategy, we show the existence and properties of several kinds of plurisubharmonic functions of $f$, the main functions of which are induced from the Böttcher coordinates, and investigate the asymptotic behavior of the functions toward the boundaries of the unions. Consequently, we obtain a plurisubharmonic function on the complement of specific fibers in the basin, which is continuous and pluriharmonic on open and dense subsets of the complement and describes an certain weighted vertical dynamics well.

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arXiv2018

A construction of Böttcher coordinates for holomorphic skew products

Let $f(z,w)=(p(z),q(z,w))$ be a holomorphic skew product with a superattracting fixed point at the origin. Under one or two assumptions, we prove that $f$ is conjugate to a monomial map on an invariant open set whose closure contains the origin. The monomial map and the open set are determined by the degree of $p$ and the Newton polygon of $q$.

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arXiv2015

Böttcher coordinates at superattracting fixed points of holomorphic skew products

Let $f : (\mathbb{C}^2, 0) \to (\mathbb{C}^2, 0)$ be a germ of holomorphic skew product with a superattracting fixed point at the origin. If it has a suitable weight, then we can construct a Böttcher coordinate which conjugates $f$ to the associated monomial map. This Böttcher coordinate is defined on an open set whose interior or boundary contains the origin.

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arXiv2012

Green functions and weights of polynomial skew products on C^2

We study the dynamics of polynomial skew products on C^2. By using suitable weights, we prove the existence of several types of Green functions. Largely, continuity and plurisubharmonicity follow. Moreover, it relates to the dynamics of the rational extensions to weighted projective spaces.

math.DS↗
arXiv2007

Dynamics of symmetric holomorphic maps on projective spaces

We consider complex dynamics of a critically finite holomorphic map from P^k to P^k, which has symmetries associated with the symmetric group S_{k+2} acting on P^k, for each k \ge 1. The Fatou set of each map of this family consists of attractive basins of superattracting points. Each map of this family satisfies Axiom A.

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