Zariski dense discontinuous surface groups for reductive symmetric spaces

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Hauptverfasser: Kannaka, Kazuki, Okuda, Takayuki, Tojo, Koichi
Format: Preprint
Veröffentlicht: 2023
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author Kannaka, Kazuki
Okuda, Takayuki
Tojo, Koichi
author_facet Kannaka, Kazuki
Okuda, Takayuki
Tojo, Koichi
contents Let $G/H$ be a homogeneous space of reductive type with non-compact $H$. The study of deformations of discontinuous groups for $G/H$ was initiated by T.~Kobayashi. In this paper, we show that a standard discontinuous group $Γ$ admits a non-standard small deformation as a discontinuous group for $G/H$ if $Γ$ is isomorphic to a surface group of high genus and its Zariski closure is locally isomorphic to $SL(2,\mathbb{R})$. Furthermore, we also prove that if $G/H$ is a symmetric space and admits some non virtually abelian discontinuous groups, then $G$ contains a Zariski-dense discrete surface subgroup of high genus acting properly discontinuously on $G/H$. As a key part of our proofs, we show that for a discrete surface subgroup $Γ$ of high genus contained in a reductive group $G$, if the Zariski closure of $Γ$ is locally isomorphic to $SL(2,\mathbb{R})$, then $Γ$ admits a small deformation in $G$ whose Zariski closure is a reductive subgroup of the same real rank as $G$.
format Preprint
id arxiv_https___arxiv_org_abs_2309_08331
institution arXiv
publishDate 2023
record_format arxiv
spellingShingle Zariski dense discontinuous surface groups for reductive symmetric spaces
Kannaka, Kazuki
Okuda, Takayuki
Tojo, Koichi
Differential Geometry
Representation Theory
Primary 57S30, Secondary 22E40, 22F30, 30F35, 30F60
Let $G/H$ be a homogeneous space of reductive type with non-compact $H$. The study of deformations of discontinuous groups for $G/H$ was initiated by T.~Kobayashi. In this paper, we show that a standard discontinuous group $Γ$ admits a non-standard small deformation as a discontinuous group for $G/H$ if $Γ$ is isomorphic to a surface group of high genus and its Zariski closure is locally isomorphic to $SL(2,\mathbb{R})$. Furthermore, we also prove that if $G/H$ is a symmetric space and admits some non virtually abelian discontinuous groups, then $G$ contains a Zariski-dense discrete surface subgroup of high genus acting properly discontinuously on $G/H$. As a key part of our proofs, we show that for a discrete surface subgroup $Γ$ of high genus contained in a reductive group $G$, if the Zariski closure of $Γ$ is locally isomorphic to $SL(2,\mathbb{R})$, then $Γ$ admits a small deformation in $G$ whose Zariski closure is a reductive subgroup of the same real rank as $G$.
title Zariski dense discontinuous surface groups for reductive symmetric spaces
topic Differential Geometry
Representation Theory
Primary 57S30, Secondary 22E40, 22F30, 30F35, 30F60
url https://arxiv.org/abs/2309.08331