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SUMMARY:Shirly Geffen (WWU Münster)
DTSTART:20221102T190000Z
DTEND:20221102T200000Z
DTSTAMP:20260420T053230Z
UID:NYC-NCG/108
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/NYC-NCG/108/
 ">Dynamical comparison of amenable actions by non-amenable groups.</a>\nby
  Shirly Geffen (WWU Münster) as part of Noncommutative geometry in NYC\n\
 n\nAbstract\nWe pull back boundary-type actions to paradoxical decompositi
 ons of the acting group itself. \nIn particular\, we obtain strong paradox
 ical structure in non-elementary hyperbolic groups\, in many lattices in L
 ie groups\, and in non-elementary Baumslag-Solitar groups.\nThis allows us
  to show that whenever such groups admit a minimal amenable topologically 
 free action on a compact Hausdorff space\, the system has dynamical compar
 ison and the attached crossed product is a purely infinite classifiable C*
 -algebra.\n\nThis is joint work with Eusebio Gardella\, Julian Kranz\, and
  Petr Naryshkin.\n
LOCATION:https://researchseminars.org/talk/NYC-NCG/108/
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