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SUMMARY:Invariant random subgroups\, elementwise conservative actions and 
 boomerang subgroups [Geometric Group Theory Oberseminar]
DTSTART:20251119T100000Z
DTEND:20251119T110000Z
DTSTAMP:20260308T033800Z
UID:indico-event-675@math-events.uni-bonn.de
DESCRIPTION:Speakers: Waltraud Lederle (Uni Bielefeld)\n\n Invariant rand
 om subgroups\, which are probability measures on sets of subgroups\, have 
 been an important subject of research in the last 15 years and can be thou
 ght of as point stabilizers of probability measure preserving (p.m.p.) act
 ions. We are introducing elementwise conservative (EC) actions as generali
 zations of p.m.p. actions\, and boomerang subgroups as "generic instances"
  of EC actions. I will talk about what these objects are\, what they have 
 in common and what tells them apart. Topics that we will adress in this ta
 lks are Margulis' normal subgroup theorem and the Stuck-Zimmer rigidity th
 orem\, Poincaré recurrence\, non-singular dynamics\, Schreier graphs and 
 critical exponents or growth rates.\n\nhttps://math-events.uni-bonn.de/eve
 nt/675/
LOCATION:Endenicher Allee 60/0-008 (Mathezentrum)
URL:https://math-events.uni-bonn.de/event/675/
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