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We introduce three quantities related to orbits of non-elliptic continuous semigroups of holomorphic self-maps of the unit disc, the total speed, the orthogonal speed and the tangential speed and show how they are related and what can be…

Complex Variables · Mathematics 2019-07-17 Filippo Bracci

There are many classical results, related to the Denjoy--Wolff Theorem, concerning the relationship between orbits of interior points and orbits of boundary points under iterates of holomorphic self-maps of the unit disc. Here, for the…

Dynamical Systems · Mathematics 2023-06-28 Anna Miriam Benini , Vasiliki Evdoridou , Núria Fagella , Philip J. Rippon , Gwyneth M. Stallard

If $\varphi$ is an analytic function from the unit disk $\mathbb{D}$ to itself, and $\varphi$ is not a conformal automorphism, we denote by $\lambda_{\varphi}$ its Denjoy-Wolff point, that is, the limit of the iterates…

Dynamical Systems · Mathematics 2022-05-17 Serban Belinschi , Hari Bercovici , Ching Wei Ho

This paper investigates the dynamical behaviour of holomorphic self-maps of the upper half-plane. More precisely, we focus on the hyperbolic and parabolic self-maps whose orbits approach the Denjoy--Wolff point with the slowest possible…

Complex Variables · Mathematics 2025-10-15 Francisco J. Cruz-Zamorano , Konstantinos Zarvalis

We characterize the simply connected domains $\Omega\subsetneq\mathbb{C}$ that exhibit the Denjoy-Wolff Property, meaning that every holomorphic self-map of $\Omega$ without fixed points has a Denjoy-Wolff point. We demonstrate that this…

Complex Variables · Mathematics 2024-09-19 Anna Miriam Benini , Filippo Bracci

We provide a complete characterization of those non-elliptic semigroups of holomorphic self-maps of the unit disc for which the linear span of eigenvectors of the generator of the corresponding semigroup of composition operators is…

Complex Variables · Mathematics 2025-03-26 Filippo Bracci , Eva A. Gallardo-Gutiérrez , Dmitry Yakubovich

We prove that any coadjoint orbit with real eigenvalues of a complex semisimple Lie group, equipped with the real part of the canonical holomorphic symplectic form, is symplectomorphic to the cotangent bundle of a (partial) flag manifold.…

Symplectic Geometry · Mathematics 2008-10-22 Hassan Azad , Erik van den Ban , Indranil Biswas

It's known from from work of Hofer, Wysocki, and Zehnder [1996] and Bourgeois [2002] that in a contact manifold equipped with either a nondegenerate or Morse-Bott contact form, a finite-energy pseudoholomorphic curve will be asymptotic at…

Symplectic Geometry · Mathematics 2017-05-19 Richard Siefring

Let $F=(\phi, \psi):\mathbb{D}^2\to\mathbb{D}^2$ denote a holomorphic self-map of the bidisk without interior fixed points. It is well-known that, unlike the case with self-maps of the disk, the sequence of iterates $$\{F^n:=F\circ F\circ…

Functional Analysis · Mathematics 2023-04-27 Michael T. Jury , Georgios Tsikalas

The aim of this work is to establish the celebrated Denjoy-Wolff Theorem in the context of generalized Loewner chains. In contrast with the classical situation where essentially convergence to a certain point in the closed unit disk is the…

Dynamical Systems · Mathematics 2009-10-16 Tiziano Casavecchia , Santiago Diaz-Madrigal

We give a necessary and sufficient condition so that a pair of disjoint Jordan regions in the sphere can be quasiconformally mapped to a pair of disks. As a consequence, we obtain a simple characterization that involves Lipschitz functions…

Complex Variables · Mathematics 2026-02-20 Dimitrios Ntalampekos

Let $(\phi_t)$ be a semigroup of holomorphic self-maps of~$\mathbb D$. In this note, we use an abstract approach to define the K\"onigs function of $(\phi_t)$ and "holomorphic models" and show how to deduce the existence and properties of…

Complex Variables · Mathematics 2018-04-30 Filippo Bracci , Manuel D. Contreras , Santiago Díaz-Madrigal

In rigorous study of stochastic models for the wave turbulence theory and R. Peierls's kinetic theory for the thermal conductivity in solids, analysis of integrals of the form $\int_{\mathcal{M}} \frac{F\omega_\mathcal{M}}{\Omega^2 +…

Mathematical Physics · Physics 2025-09-29 Alexey Elokhin

Let $\varphi$ be a univalent non-elliptic self-map of the unit disc $\mathbb D$ and let $(\psi_{t})$ be a continuous one-parameter semigroup of holomorphic functions in $\mathbb D$ such that $\psi_{1}\neq\mathrm{id}_{\mathbb D}$ commutes…

Complex Variables · Mathematics 2025-12-11 Manuel D. Contreras , Santiago Díaz-Madrigal , Pavel Gumenyuk

Let $\Omega$ be a planar Jordan domain and $\alpha>0$. We consider double-dome-like surfaces $\Sigma(\Omega,t^{\alpha})$ over $\overline{\Omega}$ where the height of the surface over any point $x\in\overline{\Omega}$ equals…

Metric Geometry · Mathematics 2017-07-03 Vyron Vellis

Let $\Omega$ be a domain in $\mathbb C^n$. Suppose that $\partial\Omega$ is smooth pseudoconvex of D'Angelo finite type near a boundary point $\xi_0\in \partial\Omega$ and the Levi form has corank at most $1$ at $\xi_0$. Our goal is to show…

Complex Variables · Mathematics 2019-07-11 Van Thu Ninh , Anh Duc Mai , Thi Lan Huong Nguyen , Hyeseon Kim

We study boundary singularities which can appear for infinitesimal generators of one-parameter semigroups of holomorphic self-maps in the unit disc. We introduce "regular" fractional singularities and characterize them in terms of the…

Complex Variables · Mathematics 2013-10-08 Filippo Bracci , Pavel Gumenyuk

Let $X$ be a compact metric space. By $2^X$ we denote the hyperspace of all closed and non-empty subsets of $X$ endowed with the Hausdorff metric. Let $f:X\to X$ be a continuous function. In this paper we study some topological properties…

General Topology · Mathematics 2025-02-06 Jorge M. Martínez-Montejano , Héctor Méndez , Yajaida N. Velázquez-Inzunza

Inspired by Benoist, we study objects linked to integrable tangent vectors on the character variety of a semi-group $\Gamma$ with values in a semi-simple real-algebraic group $\mathsf G$. We prove the \emph{cone of Jordan variations} has…

Group Theory · Mathematics 2025-12-08 Andrés Sambarino

Let $\mathbb D$ be the unit disc in $\mathbb C$ and let $f:\mathbb D \to \mathbb C$ be a Riemann map, $\Delta=f(\mathbb D)$. We give a necessary and sufficient condition in terms of hyperbolic distance and horocycles which assures that a…

Complex Variables · Mathematics 2018-06-19 Filippo Bracci , Manuel D. Contreras , Santiago Díaz-Madrigal , Hervé Gaussier