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SUMMARY:Jun Li (University of Michigan-Ann Arbor)
DTSTART:20220329T150000Z
DTEND:20220329T160000Z
DTSTAMP:20260423T022625Z
UID:Geolis/82
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/Geolis/82/">
 Stability and isotopy of symplectomorphism groups of ruled surfaces</a>\nb
 y Jun Li (University of Michigan-Ann Arbor) as part of Geometria em Lisboa
  (IST)\n\n\nAbstract\nThe symplectomorphism groups $Symp(M\, \\omega)$ of 
 ruled surfaces have been started by Gromov\, McDuff\, and Abreu\, etc\, us
 ing J-holomorphic techniques. For rational ruled surfaces\, the topologica
 l structure of $Symp(M\, \\omega)$ is better understood\, while for irrati
 onal cases our only knowledge is for minimal ruled surfaces. In this talk\
 , we apply the J-inflation techniques of Anjos-Li-Li-Pinsonnault to irrati
 onal non-minimal ruled surfaces and prove a stability result for $Symp(M\,
  \\omega)$. As an application\, we find symplectic mapping classes that ar
 e smoothly but not symplectically isotopic to identity. The talk is based 
 on joint works with Olguta Buse.\n
LOCATION:https://researchseminars.org/talk/Geolis/82/
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