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SUMMARY:Yusuke Kawamoto (Ecole Normale Superieure)
DTSTART:20200701T111000Z
DTEND:20200701T123000Z
DTSTAMP:20260423T022712Z
UID:GDS/11
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/GDS/11/">Hom
 ogeneous quasimorphism\, C^0-topology and Lagrangian intersection</a>\nby 
 Yusuke Kawamoto (Ecole Normale Superieure) as part of Geometry and Dynamic
 s seminar\n\n\nAbstract\nThe goal of the talk is to construct a non-trivia
 l homogeneous \nquasimorphism on the group of Hamiltonian diffeomorphisms 
 of the \n2- and 4-dimensional quadric which is continuous with respect to 
 both \nC^0-topology and the Hofer metric. This answers a variant of a ques
 tion \nof Entov-Polterovich-Py. A comparison of spectral invariants for \n
 quantum cohomology rings with different coefficient fields plays a \ncruci
 al role in the proof which might be of independent interest. \nIf time per
 mits\, we will see how this comparison can be used to answer \na question 
 of Polterovich-Wu.\n
LOCATION:https://researchseminars.org/talk/GDS/11/
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