A light bulb theorem for disks
A light bulb theorem for disks
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Danica Kosanović, Université Sorbonne Paris Nord
*Please note the time change*
Online Event
Zoom link:https://princeton.zoom.us/j/453512481?pwd=OHZ5TUJvK2trVVlUVmJLZkhIRHFDUT09
I will present joint work with Peter Teichner in which we classify isotopy classes of embedded disks in a 4-manifold, for a particular kind of boundary conditions. The proof uses a trick of Cerf and involves a surprising application of homotopy groups of spaces of embeddings in codimension 3. Moreover, we recover light bulb theorems of Gabai and Schneiderman-Teichner by completely new techniques, which are even "at the level of spaces”, so can give rise to some unexpected group structures.