scholarly journals Maximal Levi subgroups acting on the Euclidean building of GLn(F)

2011 ◽  
Vol 12 (1) ◽  
pp. 7-19
Author(s):  
Jonathan Needleman
Keyword(s):  
Euclidean Building

scholarly journals Wonderful compactifications of Bruhat-Tits buildings

2017 ◽  
Vol Volume 1 ◽  
Author(s):  
Bertrand Remy ◽  
Amaury Thuillier ◽  
Annette Werner
Keyword(s):  
Local Field ◽  
Semisimple Group ◽  
The Other ◽  
Analytic Space ◽  
Ground Field ◽  
Berkovich Analytic Space ◽  
Euclidean Building ◽  
The Relationship

Given a split semisimple group over a local field, we consider the maximal Satake-Berkovich compactification of the corresponding Euclidean building. We prove that it can be equivariantly identified with the compactification which we get by embedding the building in the Berkovich analytic space associated to the wonderful compactification of the group. The construction of this embedding map is achieved over a general non-archimedean complete ground field. The relationship between the structures at infinity, one coming from strata of the wonderful compactification and the other from Bruhat-Tits buildings, is also investigated.

scholarly journals A rank rigidity result for CAT(0) spaces with one-dimensional Tits boundaries

2019 ◽  
Vol 31 (5) ◽  
pp. 1317-1330
Author(s):  
Russell Ricks
Keyword(s):  
Symmetric Space ◽  
Group Action ◽  
Spherical Building ◽  
Rigidity Result ◽  
One Dimensional ◽  
Higher Rank ◽  
Geodesically Complete ◽  
Euclidean Building ◽  
Alternate Condition

AbstractWe prove the following rank rigidity result for proper {\operatorname{CAT}(0)} spaces with one-dimensional Tits boundaries: Let Γ be a group acting properly discontinuously, cocompactly, and by isometries on such a space X. If the Tits diameter of {\partial X} equals π and Γ does not act minimally on {\partial X}, then {\partial X} is a spherical building or a spherical join. If X is also geodesically complete, then X is a Euclidean building, higher rank symmetric space, or a nontrivial product. Much of the proof, which involves finding a Tits-closed convex building-like subset of {\partial X}, does not require the Tits diameter to be π, and we give an alternate condition that guarantees rigidity when this hypothesis is removed, which is that a certain invariant of the group action be even.

scholarly journals A free subgroup in the image of the 4-strand Burau representation

2015 ◽  
Vol 24 (12) ◽  
pp. 1550065
Author(s):  
Stefan Witzel ◽  
Matthew C. B. Zaremsky
Keyword(s):  
Free Group ◽  
Braid Group ◽  
Free Subgroup ◽  
The Other ◽  
Metric Geometry ◽  
Burau Representation ◽  
Euclidean Building

It is known that the Burau representation of the 4-strand braid group is faithful if and only if certain matrices f and k generate a (non-abelian) free group. Regarding f and k as isometries of a Euclidean building, we show that f3 and k3 generate a free group. We give two proofs, one utilizing the metric geometry of the building, and the other using simplicial retractions.

scholarly journals Gelfand pairs and strong transitivity for Euclidean buildings

2014 ◽  
Vol 35 (4) ◽  
pp. 1056-1078 ◽  
Author(s):  
PIERRE-EMMANUEL CAPRACE ◽  
CORINA CIOBOTARU
Keyword(s):  
Locally Compact Group ◽  
Gelfand Pair ◽  
Gelfand Pairs ◽  
Spherical Building ◽  
Locally Compact ◽  
Locally Finite ◽  
Simple Algebraic Group ◽  
Strongly Regular ◽  
Euclidean Building ◽  
Euclidean Buildings

AbstractLet $G$ be a locally compact group acting properly, by type-preserving automorphisms on a locally finite thick Euclidean building $\Delta $, and $K$ be the stabilizer of a special vertex in $\Delta $. It is known that $(G, K)$ is a Gelfand pair as soon as $G$ acts strongly transitively on $\Delta $; in particular, this is the case when $G$ is a semi-simple algebraic group over a local field. We show a converse to this statement, namely that if $(G, K)$ is a Gelfand pair and $G$ acts cocompactly on $\Delta $, then the action is strongly transitive. The proof uses the existence of strongly regular hyperbolic elements in $G$ and their peculiar dynamics on the spherical building at infinity. Other equivalent formulations are also obtained, including the fact that $G$ is strongly transitive on $\Delta $ if and only if it is strongly transitive on the spherical building at infinity.

Centralizers in à 2 groups

2011 ◽  
Vol 14 (6) ◽  
Author(s):  
Guyan Robertson
Keyword(s):  
Discrete Group ◽  
Finite Graph ◽  
Two Dimensional ◽  
Cyclic Groups ◽  
Bieberbach Group ◽  
Euclidean Building ◽  
Torsion Free

AbstractLet Γ be a torsion-free discrete group acting cocompactly on a two dimensional euclidean building Δ. The centralizer of an element of Γ is either a Bieberbach group or is described by a finite graph of finite cyclic groups. Explicit examples are computed, with Δ of type

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