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In this talk we shall show a perfect fluid cosmological model and its properties. The model possesses an orthogonally transitive abelian two-dimensional group of isometries that corresponds to cylindrical symmetry. The matter content is a…

General Relativity and Quantum Cosmology · Physics 2009-06-01 L. Fernández Jambrina

Let $\bar\gamma$ be a link in a Seifert fibered space $M$ over a hyperbolic $2$-orbifolds $\mathcal O$ that projects injectively to a filling multicurve of closed geodesics $\gamma$ in $\mathcal O.$ We prove that the complement…

Geometric Topology · Mathematics 2021-01-06 Tommaso Cremaschi , José Andrés Rodríguez Migueles

We construct a smooth nontrivial mixed partially hyperbolic system and explicitly identify its skeleton. This example shares characteristics with the classical examples. Moreover, the support of each physical measure contains three fixed…

Dynamical Systems · Mathematics 2026-01-01 Zhang Hangyue

We prove a Khintchine type theorem for approximation of elements in the Cantor set, as a subset of the formal Laurent series over $\mathbb{F}_3$, by rational functions of a specific type. Furthermore we construct elements in the Cantor set…

Number Theory · Mathematics 2014-09-02 Steffen Højris Pedersen

We demonstrate how to construct three-dimensional compact hyperbolic polyhedra using Newton's Method. Under the restriction that the dihedral angles are non-obtuse, Andreev's Theorem provides as necessary and sufficient conditions five…

Geometric Topology · Mathematics 2007-05-23 Roland K. W. Roeder

The combinatorial hierarchical hyperbolicity criterion is a very useful way of constructing new hierarchically hyperbolic spaces (HHSs). We show that, conversely, HHSs satisfying natural assumptions (satisfied, for example, by mapping class…

Group Theory · Mathematics 2026-03-25 Mark Hagen , Giorgio Mangioni , Alessandro Sisto

For Cantor circle Julia sets of hyperbolic rational maps, we prove that they are quasisymmetrically equivalent to standard Cantor circles (i.e., connected components are round circles). This gives a quasisymmetric uniformization of all…

Dynamical Systems · Mathematics 2021-01-26 Weiyuan Qiu , Fei Yang

We compute the l^2-Betti numbers of the complement of a finite collection of affine hyperplanes in complex space. At most one of the l^2-Betti numbers is non-zero.

Algebraic Topology · Mathematics 2007-05-23 M. W. Davis , T. Januszkiewicz , I. J. Leary

Sponges were recently proposed as a generalization of lattices, focussing on joins/meets of sets, while letting go of associativity/transitivity. In this work we provide tools for characterizing and constructing sponges on metric spaces and…

Metric Geometry · Mathematics 2018-04-20 Jasper J. van de Gronde , Wim H. Hesselink

We study combinatorial modulus on boundaries of hyperbolic Coxeter groups. We give new examples of hyperbolic groups whose boundary satisfies a combinatorial version of the Loewner property, and prove Cannon's conjecture for Coxeter groups.…

Group Theory · Mathematics 2011-05-04 Marc Bourdon , Bruce Kleiner

We build quasi--isometry invariants of relatively hyperbolic groups which detect the hyperbolic parts of the group; these are variations of the stable dimension constructions previously introduced by the authors. We prove that, given any…

Group Theory · Mathematics 2016-09-19 Matthew Cordes , David Hume

We construct a one-to-one continuous map from the Morse boundary of a hierarchically hyperbolic group to its Martin boundary. This construction is based on deviation inequalities generalizing Ancona's work on hyperbolic groups. This…

Group Theory · Mathematics 2022-09-07 Matthew Cordes , Matthieu Dussaule , Ilya Gekhtman

In arXiv math.MG/0207296 we introduced a product construction for locally compact, complete, geodesic hyperbolic metric spaces. In the present paper we define the hyperbolic product for general Gromov-hyperbolic spaces. In the case of…

Metric Geometry · Mathematics 2007-05-23 Thomas Foertsch , Viktor Schroeder

We give necessary and sufficient conditions for a hyperbolic set to be non-chaotic (or, conversely, chaotic) in a certain sense.

Dynamical Systems · Mathematics 2026-03-11 Noriaki Kawaguchi

This article simply presents several coordinate systems for 2 and 3-dimensional hyperbolic spaces, describing the general solutions of Helmholtz equation in each one of these systems.

Mathematical Physics · Physics 2007-05-23 S. S. e Costa

Consider a finitely generated group $G$ that is relatively hyperbolic with respect to a family of subgroups $H_1, ..., H_n$. We present an axiomatic approach to the problem of extending metric properties from the subgroups $H_i$ to the full…

Group Theory · Mathematics 2019-07-17 Daniel A. Ramras , Bobby W. Ramsey

We introduce a class of self-similar sets which we call {\em twofold Cantor sets} $K_{pq}$ in $\mathbb R$ which are totally disconnected, do not have weak separation property and at the same time have isomorphic self-similar structures.

Metric Geometry · Mathematics 2018-02-13 Kirill Kamalutdinov , Andrei Tetenov

In this article, we use the second intrinsic volume to define a metric on the space of homothetic classes of Gaussian bounded convex bodies in a separable real Hilbert space. Using kernels of hyperbolic type, we can deduce that this space…

Metric Geometry · Mathematics 2024-09-27 Yusen Long

For a compact set $K\subset \mathbb{R}^1$ and a family $\{C_\lambda\}_{\lambda\in J}$ of dynamically defined Cantor sets sufficiently close to affine with $\text{dim}_H\, K+\text{dim}_H\, C_\lambda>1$ for all $\lambda\in J$, under natural…

Dynamical Systems · Mathematics 2015-10-26 Anton Gorodetski , Scott Northrup

For metric spaces, the doubling property, the uniform disconnectedness, and the uniform perfectness are known as quasi-symmetric invariant properties. The David-Semmes uniformization theorem states that if a compact metric space satisfies…

Metric Geometry · Mathematics 2019-02-11 Yoshito Ishiki