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SUMMARY:About a big mapping class group.
DTSTART:20151202T163000
DTEND:20151202T173000
DTSTAMP:20260407T130052Z
UID:b5f9bd2d9e3c75595adaa5e2e2f460f7f0fd3b62892d4eca30487bf5
CATEGORIES:Conferences - Seminars
DESCRIPTION:Juliette Bavard (Paris)\nThe mapping class group of the comple
 ment of a Cantor set in the plane arises naturally in dynamics. To get inf
 ormations about this "big mapping class group"\, we can look at its action
  on a Gromov hyperbolic space: the ray graph. In this talk\, I will explai
 n why this ray graph has infinite diameter and is Gromov-hyperbolic. I wil
 l then exhibit an element of the big MCG which has a loxodromic action on 
 the ray graph\, and explain why this element is useful to construct non tr
 ivial quasimorphisms on the group.
LOCATION:CM010
STATUS:CONFIRMED
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