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SUMMARY:Towards geometric finiteness in mapping class groups [Geometric Gr
 oup Theory Oberseminar]
DTSTART:20251217T100000Z
DTEND:20251217T110000Z
DTSTAMP:20260308T035400Z
UID:indico-event-677@math-events.uni-bonn.de
DESCRIPTION:Speakers: Alessandro Sisto (Heriot-Watt University)\n\niven a 
 subgroup of a mapping class group\, there is a corresponding extension gro
 up\, and fundamental groups of surface bundles (with injective monodromy) 
 are exactly these extension groups.Farb and Mosher introduced the notion o
 f convex-cocompact subgroup of a mapping class group\, and a subgroup is c
 onvex-cocompact if and only if the corresponding extension group is hyperb
 olic. Moving beyond this\, one may wonder what happens for subgroups that 
 are "close" to convex-cocompact. I will discuss some cases where the corre
 sponding extension groups are hierarchically hyperbolic\; I will explain w
 hat this means\, what consequences this has\, and speculate about notions 
 of geometric finiteness in mapping class groups.Based on joint works with 
 Spencer Dowdall\, Matt Durham\, and Chris Leininger\, and Jacob Russell.\n
 \nhttps://math-events.uni-bonn.de/event/677/
LOCATION:Endenicher Allee 60/0-008 (Mathezentrum)
URL:https://math-events.uni-bonn.de/event/677/
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