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SUMMARY:Curve Graphs and Surface Diffeomorphism Groups - Sebastian Hensel 
 (University of Munich)
DTSTART:20210205T134500Z
DTEND:20210205T144500Z
UID:TALK155893@talks.cam.ac.uk
CONTACT:76015
DESCRIPTION:We will discuss a new type of curve graph and apply it to the 
 study of surface diffeomorphism and homeomorphism groups. On the one hand\
 , we will present a construction (joint with Jonathan Bowden and Richard W
 ebb) of nontrivial quasimorphisms on the group of diffeomorphisms of a sur
 face of genus at least 1 which are isotopic to the identity. As a conseque
 nce\, this solves a question by Burago-Ivanov-Polterovich on the unbounded
 ness of the fragmentation norm. \nI will also talk about work in progress 
 (joint additionally with Katie Mann and Emmanuel Militon) which begins to 
 develop a dictionary between the dynamics of torus homeomorphisms and thei
 r action on the new curve graph.\n
LOCATION:Zoom https://maths-cam-ac-uk.zoom.us/j/95208706709
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