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SUMMARY:Automorphisms of virtually special groups [Geometric Group Theory 
 Oberseminar]
DTSTART:20251022T090000Z
DTEND:20251022T100000Z
DTSTAMP:20260308T045300Z
UID:indico-event-671@math-events.uni-bonn.de
DESCRIPTION:Speakers: Elia Fioravanti (KIT)\n\nFor which families of finit
 ely generated groups G are automorphisms "tame"? For instance\, one can wo
 nder whether Out(G) is finitely generated\, or whether the stretch factors
  of the automorphisms of G are algebraic integers. Following breakthroughs
  of Rips and Sela in the 90s\, automorphisms of hyperbolic groups are know
 n to satisfy both of these forms of tameness\, but much less is known on a
 utomorphisms of more general non-positively curved groups. We show that au
 tomorphisms of compact special groups (in the sense of Haglund and Wise) a
 lso satisfy the same two forms of tameness. Proofs rely on non-small R-tre
 es and a new JSJ decomposition over centralisers.\n \n\nhttps://math-even
 ts.uni-bonn.de/event/671/
LOCATION:Endenicher Allee 60/0-008 (Mathezentrum)
URL:https://math-events.uni-bonn.de/event/671/
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