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SUMMARY:Sam Kim (KIAS)
DTSTART:20211118T150500Z
DTEND:20211118T155500Z
DTSTAMP:20260423T003232Z
UID:GaTO/44
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/GaTO/44/">Op
 timal regularity of mapping class group actions on the circle</a>\nby Sam 
 Kim (KIAS) as part of Geometry and topology online\n\n\nAbstract\nWe prove
  that for each finite index subgroup $H$ of the mapping class group of a c
 losed hyperbolic surface\, and for each real number $r>1$ there does not e
 xist a faithful $C^r$-action (in Hölder's sense) of $H$ on a circle. For 
 this\, we partially determine the optimal regularity of faithful actions b
 y right-angled Artin groups on a circle. (Joint with Thomas Koberda and Cr
 istobal Rivas)\n
LOCATION:https://researchseminars.org/talk/GaTO/44/
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