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For a Kobayashi hyperbolic domain, Abate introduced the notion of small and big horospheres of a given radius at a boundary point with a pole. In this article, we investigate which domains have the property that closed big horospheres and…

Complex Variables · Mathematics 2025-12-12 Vikramjeet Singh Chandel , Nishith Mandal

Let $D_F = \{(z_0, z) \in {\C}^{n} | |z_0|^2 < b, \|z\|^2 < F(|z_0|^2) \}$ be a strongly pseudoconvex Hartogs domain endowed with the \K metric $g_F$ associated to the \K form $\omega_F = -\frac{i}{2} \partial \bar{\partial} \log…

Differential Geometry · Mathematics 2008-03-26 Antonio J. Di Scala , Andrea Loi , Fabio Zuddas

For a Riemannian manifold $M^{n+1}$ and a compact domain $\Omega \subset M^{n+1}$ bounded by a hypersurface $\partial \Omega$ with normal curvature bounded below, estimates are obtained in terms of the distance from $O$ to $\partial \Omega$…

Differential Geometry · Mathematics 2015-06-12 Alexander Borisenko , Kostiantyn Drach

An $n$-dimensional Hartogs domain $D_F$ with strongly pseudoconvex boundary can be equipped with a natural Kaehler metric $g_F$. This paper contains two results. In the first one we prove that if $g_F$ is an extremal Kaehler metric then…

Differential Geometry · Mathematics 2008-05-12 Andrea Loi , Fabio Zuddas

The goal of this paper is to exhibit and analyze an algorithm that takes a given closed orientable hyperbolic surface and outputs an explicit Dirichlet domain. The input is a fundamental polygon with side pairings. While grounded in…

Computational Geometry · Computer Science 2022-12-06 Vincent Despré , Benedikt Kolbe , Hugo Parlier , Monique Teillaud

We characterize the class of Gromov hyperbolic spaces, whose boundary at infinity allow canonical M\"obius structures.

Metric Geometry · Mathematics 2012-10-19 Renlong Miao , Viktor Schroeder

We look at periodic Jacobi matrices on trees. We provide upper and lower bounds on the gap of such operators analogous to the well known gap in the spectrum of the Laplacian on the upper half-plane with hyperbolic metric. We make some…

Spectral Theory · Mathematics 2021-04-28 Jacob S. Christiansen , Barry Simon , Maxim Zinchenko

We define the concept of an ultrametric M\"obius space and use this to characterize nonelementary geodesically complete trees.

Metric Geometry · Mathematics 2015-08-14 Jonas Beyrer , Viktor Schroeder

The spectral geometry of negatively curved manifolds has received more attention than its positive curvature counterpart. In this paper we will survey a variety of spectral geometry results that are known to hold in the context of…

Differential Geometry · Mathematics 2024-11-12 Emilio A. Lauret , Benjamin Linowitz

The Cartan-Hartogs domains are defined as a class of Hartogs type domains over irreducible bounded symmetric domains. For a Cartan-Hartogs domain $\Omega^{B}(\mu)$ endowed with the natural K\"{a}hler metric $g(\mu),$ Zedda conjectured that…

Complex Variables · Mathematics 2017-06-30 Enchao Bi , Zhenhan Tu

In this article we study a controllability problem for a parabolic and a hyperbolic partial differential equations in which the control is the shape of the domain where the equation holds. The quantity to be controlled is the trace of the…

Analysis of PDEs · Mathematics 2012-11-07 Jonathan Touboul

We consider certain inequalities among the Apollonian metric, the Apollonian inner metric, the $j$ metric and the quasihyperbolic metric. We verify that whether these inequalities can occur in simply connected planar domains and in proper…

Classical Analysis and ODEs · Mathematics 2010-05-25 Swadesh Kumar Sahoo

We present an inverse problem which uses the renormalized area functional on minimal submanifolds to recover the expansion of asymptotically hyperbolic, conformally compact metrics which are partially even to high order. We use a rigidity…

Differential Geometry · Mathematics 2024-01-17 Jared Marx-Kuo

This paper contains a new concept to measure the width and thickness of a convex body in the hyperbolic plane. We compare the known concepts with the new one and prove some results on bodies of constant width, constant diameter and given…

Metric Geometry · Mathematics 2020-12-01 Ákos G. Horváth

We use properties of the hyperbolic metric and properties of the modular function to show that the Bohr's radius for covering maps onto hyperbolic domains is greater or equal to exponential minus pi. This includes almost all known classes…

Metric Geometry · Mathematics 2024-03-19 Yusuf Abu Muhanna , Issam Louhichi

In this paper, we obtain a more precise estimate of Catlin-type distance for smoothly bounded pseudoconvex domain of finite type in $\mathbb{C}^2$. As an application, we get an alternative proof of the Gromov hyperbolicity of this domain…

Complex Variables · Mathematics 2023-09-26 Haichou Li , Xingsi Pu , Lang Wang

We introduce the notion of locally visible and locally Gromov hyperbolic domains in $\mathbb C^d$. We prove that a bounded domain in $\mathbb C^d$ is locally visible and locally Gromov hyperbolic if and only if it is (globally) visible and…

Complex Variables · Mathematics 2023-11-28 Filippo Bracci , Hervé Gaussier , Nikolai Nikolov , Pascal J. Thomas

In this paper, we investigate Gromov hyperbolizations of unbounded locally complete and incomplete metric spaces associated with three hyperbolic type metrics: the hyperbolization metric introduced by Ibragimov, the distance ratio metric,…

Complex Variables · Mathematics 2024-04-09 Qingshan Zhou

We study the bottom of the spectrum in Hilbert geometries, we show that it is zero if and only if the geometry is amenable, in other words if and only if it admits a F\"olner sequence. We also show that the bottom of the spectrum admits an…

Differential Geometry · Mathematics 2010-05-11 Constantin Vernicos

This paper consists of two results dealing with balanced metrics (in S. Donaldson terminology) on nonconpact complex manifolds. In the first one we describe all balanced metrics on Cartan domains. In the second one we show that the only…

Differential Geometry · Mathematics 2012-04-16 Andrea Loi , Michela Zedda