Event
Mohammed Abouzaid (Columbia)
Friday, November 26, 2021 09:15to10:45
Title:ÌýComplex cobordism and Hamiltonian fibrations.
´¡²ú²õ³Ù°ù²¹³¦³Ù:ÌýI will discuss joint work with McLean and Smith, lifting the results of Seidel, Lalonde, McDuff, and Polterovich concerning the topology of Hamiltonian fibrations over the 2-sphere from rational cohomology to complex cobordism. In addition to the use of Morava K-theory (as in the recent work with Blumberg on the Arnold Conjecture), the essential new ingredient is the construction of global Kuranishi charts for genus 0 pseudo-holomorphic curves; i.e. their realisation as quotients of zero loci of sections of equivariant vector bundles on manifolds.