On surgery curves for genus one slice knots

Details On surgery curves for genus one slice knots On surgery curves for genus one slice knots

2011-09-07

arxiv.org/abs/1109.1518v2

Mathematics

Geometric Topology

16 pages, 1 figure, expositional changes

Scientific paper

If a knot K bounds a genus one Seifert surface F in the 3-sphere and F contains an essential simple closed curve alpha that has induced framing 0 and is smoothly slice, then K is smoothly slice. Conjecturally, the converse holds. It is known that if K is slice, then there are strong constraints on the algebraic concordance class of such alpha, and it was thought that these constraints might imply that alpha is at least algebraically slice. We present a counterexample; in the process we answer negatively a question of Cooper and relate the result to a problem of Kauffman. Results of this paper depend on the interplay between the Casson-Gordon invariants of K and algebraic invariants of alpha.

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