Signature defects, handles, and ribbon discs
Marco Golla
Uppsala University
https://www.math.sciences.univ-nantes.fr/~golla/
Date(s) : 24/10/2016 iCal
14h00 - 15h00
The homology groups of a manifold give a lower bound on the number of handles in a handle decomposition (or even on the cells of a CW decomposition). We use Casson-Gordon signatures to improve on this bound for rational homology 4-balls bounding a given rational homology 3-sphere. In turn, this gives information about slice and ribbon discs for knots in the 3-sphere.
This is joint work (in progress) with Paolo Aceto and Ana Lecuona.
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