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Geometry and Topology Seminar

Friday, October 2, 2020
3:00pm to 4:00pm
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Concordance invariants from the E(-1) spectral sequence
William Ballinger, Department of Mathematics, Princeton University,

Many recent concordance invariants of knots come from perturbing the differential on a knot homology theory to get a complex with trivial homology but an interesting filtration. I describe the invariant coming from Rasmussen's E(-1) spectral sequence from Khovanov homology in this way, and show that it gives a bound on the nonorientable slice genus.

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