Topology & Geometric Group Theory Seminar

Fall 2009

1:30 – 2:30, Malott 203

Thursday, October 15

Ana Rita Pires, MIT

Symplectic origami

An origami manifold is a manifold equipped with a closed 2-form which is symplectic everywhere except on a hypersurface, where it is a folded form whose kernel defines a circle fibration. In this talk, I will explain how an origami manifold can be unfolded into a collection of symplectic pieces and conversely, how a collection of symplectic pieces can be folded (modulo compatibility conditions), into an origami manifold. Using equivariant versions of these operations, we will see how classic symplectic results of convexity and classification of toric manifolds translate to the origami world. There will be pictures resembling paper origami, but no instructions on how to fold a paper crane. I will attempt to make this talk symplectically-self contained. This is joint work with Victor Guillemin and Ana Cannas da Silva.

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