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BEGIN:VEVENT
SUMMARY:Olga Varghese (University of Münster)
DTSTART:20200526T120000Z
DTEND:20200526T130000Z
DTSTAMP:20260422T225725Z
UID:TeaSeminarGeometry/1
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/TeaSeminarGe
 ometry/1/">Coxeter groups and Kazhdan's property (T)</a>\nby Olga Varghese
  (University of Münster) as part of Tea-Seminar: Geometry\, Topology and 
 Group Theory\n\nAbstract: TBA\n
LOCATION:https://researchseminars.org/talk/TeaSeminarGeometry/1/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Jonas Flechsig (University of Bielefeld)
DTSTART:20200609T120000Z
DTEND:20200609T130000Z
DTSTAMP:20260422T225725Z
UID:TeaSeminarGeometry/2
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/TeaSeminarGe
 ometry/2/">Braids and Artin groups</a>\nby Jonas Flechsig (University of B
 ielefeld) as part of Tea-Seminar: Geometry\, Topology and Group Theory\n\n
 Abstract: TBA\n
LOCATION:https://researchseminars.org/talk/TeaSeminarGeometry/2/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Pieter Senden (KU Leuven)
DTSTART:20200616T120000Z
DTEND:20200616T130000Z
DTSTAMP:20260422T225725Z
UID:TeaSeminarGeometry/3
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/TeaSeminarGe
 ometry/3/">The R_infinity property for RAAGs and graph products</a>\nby Pi
 eter Senden (KU Leuven) as part of Tea-Seminar: Geometry\, Topology and Gr
 oup Theory\n\nAbstract: TBA\n
LOCATION:https://researchseminars.org/talk/TeaSeminarGeometry/3/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Jens Bossaert (Ghent University)
DTSTART:20200630T120000Z
DTEND:20200630T130000Z
DTSTAMP:20260422T225725Z
UID:TeaSeminarGeometry/4
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/TeaSeminarGe
 ometry/4/">Expanding the universe of universal groups</a>\nby Jens Bossaer
 t (Ghent University) as part of Tea-Seminar: Geometry\, Topology and Group
  Theory\n\n\nAbstract\nIn 2000\, Burger and Mozes defined the concept of a
  universal group acting on a tree with prescribed local actions\, providin
 g interesting examples of totally disconnected locally compact groups. In 
 recent developments their foundational construction has been generalised i
 n various ways: Simon Smith studied the topological properties in a more r
 elaxed setting (where the local actions are not assumed to be transitive o
 r of finite degree)\, Adrien Le Boudec introduced "almost-universal" group
 s (where one allows for a controlled number of singularities)\, and Tom De
  Medts\, Ana Silva and Koen Struyve generalised the original notion of uni
 versal groups to the realm of right-angled buildings. We will discuss why 
 right-angled buildings are a natural setting\, try to unify these approach
 es\, and study how the permutational properties of the local groups and th
 e combinatorics of the diagram affect the topological properties of the re
 sulting groups.\n
LOCATION:https://researchseminars.org/talk/TeaSeminarGeometry/4/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Corina Ciobotaru
DTSTART:20200707T120000Z
DTEND:20200707T130000Z
DTSTAMP:20260422T225725Z
UID:TeaSeminarGeometry/5
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/TeaSeminarGe
 ometry/5/">Classical homogeneous dynamics in a non-linear setting</a>\nby 
 Corina Ciobotaru as part of Tea-Seminar: Geometry\, Topology and Group The
 ory\n\n\nAbstract\nThe automorphisms group of a bi-regular tree contains a
  rich class of non-linear subgroups G that still share the good properties
  of the linear ones. Given that\, classical questions from homogeneous dyn
 amics can be examined and proved. For example\, if H is a discrete subgrou
 p of G\, recent results show there is a classification of ergodic probabil
 ity measures on G / H that are invariant under horospherical subgroups. Wh
 en H is moreover a cocompact lattice\, the horospherical action is uniquel
 y ergodic. Or when H is a geometrically finite lattice quantitative recurr
 ence and equidistribution related to the above probability measures on G /
  H hold true. This is a joint project with Vladimir Finkelshtein and Cagri
  Sert.\n
LOCATION:https://researchseminars.org/talk/TeaSeminarGeometry/5/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Alexander Engel (University of Münster)
DTSTART:20201103T130000Z
DTEND:20201103T140000Z
DTSTAMP:20260422T225725Z
UID:TeaSeminarGeometry/6
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/TeaSeminarGe
 ometry/6/">Compactifications and Combings</a>\nby Alexander Engel (Univers
 ity of Münster) as part of Tea-Seminar: Geometry\, Topology and Group The
 ory\n\n\nAbstract\nAssume that a group G acts freely and cocompactly on a 
 contractible space X. If X admits a nice compactification to which the gro
 up action extends continuously\, then many properties of the boundary-at-i
 nfinity of X are related to properties of the group G. In this talk I will
  firstly give an overview of this setup and corresponding results\, and se
 condly discuss how to construct such nice compactifications starting from 
 a combing on X.\n
LOCATION:https://researchseminars.org/talk/TeaSeminarGeometry/6/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Philip Möller (University of Münster)
DTSTART:20201110T130000Z
DTEND:20201110T140000Z
DTSTAMP:20260422T225725Z
UID:TeaSeminarGeometry/7
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/TeaSeminarGe
 ometry/7/">Abstract group actions of locally compact groups on CAT(0) spac
 es</a>\nby Philip Möller (University of Münster) as part of Tea-Seminar:
  Geometry\, Topology and Group Theory\n\n\nAbstract\nWe study abstract gro
 up actions of locally compact Hausdorff groups on CAT(0) spaces. Under mil
 d assumptions on the action we show that it is continuous or has a global 
 fixed point. This mirrows results by Dudley and Morris-Nickolas for action
 s on trees. As a consequence we obtain a geometric proof for the fact that
  any abstract group homomorphism from a locally compact Hausorff group int
 o a torsion free CAT(0) group is continuous.\n
LOCATION:https://researchseminars.org/talk/TeaSeminarGeometry/7/
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