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Related papers: Quotients of Buildings by Non-uniform Lattices

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In \cite{FGLNP}, Fox, Gromov, Lafforgue, Naor and Pach, in a respond to a question of Gromov \cite{G}, constructed bounded degree geometric expanders, namely, simplical complexes having the affine overlapping property. Their explicit…

Combinatorics · Mathematics 2016-05-03 Shai Evra

Let $d \ge 1$. We study a subspace of the space of automorphic forms of $\mathrm{GL}_d$ over a global field of positive characteristic (or, a function field of a curve over a finite field). We fix a place $\infty$ of $F$, and we consider…

Number Theory · Mathematics 2021-01-08 Satoshi Kondo , Seidai Yasuda

Let $X$ be a locally finite irreducible affine building of dimension $\geq 2$ and $\Gamma \leq \mathrm{Aut}(X)$ be a discrete group acting cocompactly. The goal of this paper is to address the following question: When is $\Gamma$ linear?…

Group Theory · Mathematics 2018-11-22 Uri Bader , Pierre-Emmanuel Caprace , Jean Lécureux

We compute the Euler-Poincar\'e characteristic of quotients of the Bruhat-Tits building of PGL(n) under the action of arithmetic groups arising from central division algebras over rational function fields of positive characteristic. We use…

Number Theory · Mathematics 2010-06-17 Mihran Papikian

Hyperbolic buildings are central objects in both hyperbolic geometry and geometric group theory, exhibiting a wide range of intriguing characteristics, especially with respect to group actions. In this paper, we develop the theory of…

Geometric Topology · Mathematics 2024-12-06 Donghae Lee

Let \Gamma be a non-cocompact lattice on a locally finite regular right-angled building X. We prove that if \Gamma has a strict fundamental domain then \Gamma is not finitely generated. We use the separation properties of subcomplexes of X…

Group Theory · Mathematics 2014-10-01 Anne Thomas , Kevin Wortman

The wall-and-chamber structure of the dependence of the reductive GIT quotient on the choice of linearisation is well known. In this article, we first give a brief survey of recent results in non-reductive GIT, which apply when the…

Algebraic Geometry · Mathematics 2018-01-23 Gergely Bérczi , Joshua Jackson , Frances Kirwan

In this note we compute the fundamental domain of the action on the corresponding Bruhat-Tits tree of the arithmetic subgroup of PGL2 with respect to an arbitrary place of the rational function field.

Group Theory · Mathematics 2014-01-22 Ralf Köhl , Bernhard Mühlherr , Koen Struyve

In the case where $G=$SL$_{2}(F)$ for a non-archimedean local field $F$ and $\Gamma$ is a discrete torsion-free cocompact subgroup of $G$, there is a known relationship between the Ihara zeta function for the quotient of the Bruhat-Tits…

Group Theory · Mathematics 2016-06-24 Ming-Hsuan Kang , Rupert McCallum

In this paper, we study relations between Langlands L-functions and zeta functions of geodesic walks and galleries for finite quotients of the apartments of G=PGL3 and PGSp4 over a nonarchimedean local field with q elements in its residue…

Number Theory · Mathematics 2017-05-05 Ming-Hsuan Kang , Wen-Ching Winnie Li , Chian-Jen Wang

We consider finite 2-dimensional polyhedral complexes, equipped with piecewise non-positively curved, locally CAT(0) metrics. We give conditions on the complex X that ensure that its fundamental group contains a surface subgroup. Concrete…

Group Theory · Mathematics 2014-09-04 David Constantine , Jean-Francois Lafont , Izhar Oppenheim

We construct a compactification of the Bruhat-Tits building associated to the group PGL(V) which can be identified with the space of homothety classes of seminorms on V endowed with the topology of pointwise convergence. Then we define a…

Algebraic Geometry · Mathematics 2007-05-23 Annette Werner

We study joint eigenfunctions of the spherical Hecke algebra acting on $L^2(\Gamma_n \backslash G / K)$ where $G = \text{PGL}(3, F)$ with $F$ a non-archimedean local field of arbitrary characteristic, $K = \text{PGL}(3, O)$ with $O$ the…

Representation Theory · Mathematics 2024-01-01 Carsten Peterson

Let $G/\Gamma$ be the quotient of a semisimple Lie group by an arithmetic lattice. We show that for reductive subgroups $H$ of $G$ that is large enough, the orbits of $H$ on $G/\Gamma$ intersect nontrivially with a fixed compact set. As a…

Dynamical Systems · Mathematics 2021-11-04 Han Zhang , Runlin Zhang

Let $\Gamma$ be a graph product of finite groups, with finite underlying graph, and let $\Delta$ be the associated right-angled building. We prove that a uniform lattice $\Lambda$ in the cubical automorphism group Aut$(\Delta)$ is weakly…

Group Theory · Mathematics 2024-02-06 Sam Shepherd

Let $\C(\Gamma)$ be the set of isomorphism classes of the finite groups that are homomorphic images of $\Gamma$. We investigate the extent to which $\C(\Gamma)$ determines $\Gamma$ when $\Gamma$ is a group of geometric interest. If…

Group Theory · Mathematics 2015-01-08 Martin R. Bridson , Marston D. E. Conder , Alan W. Reid

Let C be a smooth, projective and geometrically integral curve defined over a finite field F. For each closed point P of C, let R be the ring of functions that are regular outside P, and let K be the completion at P of the function field of…

Group Theory · Mathematics 2022-05-17 Claudio Bravo

If $\Gamma$ is any nonuniform lattice in the group ${\rm PU}(2,1)$, let $\overline{\Gamma}$ be the quotient of $\Gamma$ obtained by filling the cusps of $\Gamma$ (i.e. killing the center of parabolic subgroups). Assuming that such a lattice…

Geometric Topology · Mathematics 2017-03-29 Pierre Py

We show that if a flat group scheme acts properly, with finite stabilizers, on an algebraic space, then a quotient exists as a separated algebraic space. More generally we show any flat groupid for which the family of stabilizers is finite…

alg-geom · Mathematics 2008-02-03 Sean Keel , Shigefumi Mori

Let $K$ be the function field of a curve $C$ over a field $\mathbb{F}$ of either odd or zero characteristic. Following the work by Serre and Mason on $\mathrm{SL}_2$, we study the action of arithmetic subgroups of $\mathrm{SU}(3)$ on its…

Group Theory · Mathematics 2022-06-13 Luis Arenas-Carmona , Claudio Bravo , Benoit Loisel , Giancarlo Lucchini Arteche
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