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We study complex hyperbolic disc bundles over closed orientable surfaces that arise from discrete and faithful representations H_n->PU(2,1), where H_n is the fundamental group of the orbifold S^2(2,...,2) and thus contains a surface group…

Geometric Topology · Mathematics 2011-11-01 Sasha Anan'in , Carlos H. Grossi , Nikolay Gusevskii

Let $e$ denote the Euler class on the space $Hom(\Gamma_g, PSL(2,\mathbb R))$ of representations of the fundamental group $\Gamma_g$ of the closed surface $\Sigma_g$ of genus $g$. Goldman showed that the connected components of…

Geometric Topology · Mathematics 2016-07-06 Louis Funar , Maxime Wolff

This article explores surface-group representations into the complex hyperbolic group $\mathrm{PU}(2,1)$ and presents domination results for a special class of representations called $T$-bent representations. Let $S_{g,k}$ be a punctured…

Geometric Topology · Mathematics 2025-10-20 Pabitra Barman , Krishnendu Gongopadhyay

We provide the first examples of strongly dense representations of a hyperbolic 3-manifold group into $SL(4,\mathbb{R})$ and $SU(3,1)$ i.e. representations where every pair of non-commuting elements has Zariski dense image. Our examples are…

Geometric Topology · Mathematics 2024-01-17 Ricky Lee

A hyperbolic conjugacy class in the modular group PSL(2,Z) corresponds to a closed geodesic in the modular orbifold. Some of these geodesics virtually bound immersed surfaces, and some do not; the distinction is related to the polyhedral…

Geometric Topology · Mathematics 2020-06-04 Danny Calegari , Joel Louwsma

We develop methods to show that infinite-dimensional modules over the Iwasawa algebra $KG$ of a uniform pro-p group are faithful and apply them to show that the metaplectic representation for the symplectic group is faithful.

Representation Theory · Mathematics 2025-05-09 Christopher Chang , Simeon Hellsten , Mario Marcos Losada , Sergiu Novac

In this article we characterize the complex hyperbolic groups that leave invariant a copy of the Veronese curve in $\Bbb{P}^2_{\Bbb{C}}$. As a corollary we get that every discrete compact surface group in $\PO^+(2,1)$ admits a deformation…

Dynamical Systems · Mathematics 2017-06-12 Angel Cano , Luis Loeza

We prove that convex-cocompact representations of finitely generated groups in the group of isometries of the infinite-dimensional hyperbolic space form an open set in the space of representations, allowing us to deform these…

Geometric Topology · Mathematics 2026-03-10 David Xu

In this notes, we characterize discrete subgroups of PU(2,1), holomorphic isometric group of complex hyperbolic space, which have an invariant totally geodesic submanifold.

Complex Variables · Mathematics 2012-02-23 Baohua Xie

In this paper we study the moduli space of representations of a surface group (i.e., the fundamental group of a closed oriented surface) in the real symplectic group Sp(2n,R). The moduli space is partitioned by an integer invariant, called…

Algebraic Geometry · Mathematics 2014-10-17 Oscar Garcia-Prada , Peter B. Gothen , Ignasi Mundet i Riera

We prove that any nonabelian, non-Fuchsian representation of a surface group into PSL(2,R) is the holonomy of a folded hyperbolic structure on the surface. Using similar ideas, we establish that any non-Fuchsian representation rho of a…

Geometric Topology · Mathematics 2016-01-20 François Guéritaud , Fanny Kassel , Maxime Wolff

We obtained some sufficient and necessary conditions of existence of faithful irreducible representations of a soluble group $G$ of finite rank over a field $k$. It was shown that the existence of such representations strongly depends on…

Group Theory · Mathematics 2012-08-14 A. V. Tushev

We prove that there exists no irreducible representation of the identity component of the isometry group ${\rm PO}(1,n)$ of the real hyperbolic space of dimension $n$ into the group ${\rm O}(2,\infty)$, if $n\geq 3$. This is motivated by…

Group Theory · Mathematics 2020-01-15 Pierre Py , Arturo Sánchez

Let $\Gamma$ be the fundamental group of a closed orientable surface of genus at least two. Consider the composition of a uniformly random element of $\mathrm{Hom}(\Gamma,S_n)$ with the $(n-1)$-dimensional irreducible representation of…

Geometric Topology · Mathematics 2025-04-30 Michael Magee , Doron Puder , Ramon van Handel

Given a number field $K$, we show that certain $K$-integral representations of closed surface groups can be deformed to being Zariski dense while preserving many useful properties of the original representation. This generalizes a method…

Geometric Topology · Mathematics 2022-11-17 Michael Zshornack

Let K be a finite extension of Qp. We fix a continuous absolutely irreducible representation of the absolute Galois group of K over a finite dimensional vector space with coefficient in a finite field of characteristic p and consider its…

Number Theory · Mathematics 2019-02-20 Eugen Hellmann , Benjamin Schraen

We construct discrete and faithful representations into the isometry group of a hyperbolic space of the fundamental groups of acute negatively curved even-sided polygons of finite groups.

Group Theory · Mathematics 2014-11-11 Michael Kapovich

We show that for a representation of the fundamental group of a triangulated closed 3-manifold (not necessarily hyperbolic) into $\PSL$ so that any edge loop has non-trivial image under the representation, there exist uncountably many…

Geometric Topology · Mathematics 2010-04-23 Tian Yang

We count the connected components in the moduli space of PU(p,q)-representations of the fundamental group for a closed oriented surface. The components are labelled by pairs of integers which arise as topological invariants of the flat…

Algebraic Geometry · Mathematics 2015-06-26 Steven B. Bradlow , Oscar Garcia-Prada , Peter B. Gothen

We construct first examples of discrete geometrically finite subgroups of PU(2,1) which contain parabolic elements, and are isomorphic to surface groups.

Differential Geometry · Mathematics 2007-05-23 Igor Belegradek
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