Holomorphic disks and genus bounds

Abstract

We prove that, like the Seiberg-Witten monopole homology, the Heegaard Floer homology for a three-manifold determines its Thurston norm. As a consequence, we show that knot Floer homology detects the genus of a knot. This leads to new proofs of certain results previously obtained using Seiberg-Witten monopole Floer homology (in collaboration with Kronheimer and Mrowka). It also leads to a purely Morse-theoretic interpretation of the genus of a knot. The method of proof shows that the canonical element of Heegaard Floer homology associated to a weakly symplectically fillable contact structure is non-trivial. In particular, for certain three-manifolds, Heegaard Floer homology gives obstructions to the existence of taut foliations.

Published by Geometry and Topology at http://www.maths.warwick.ac.uk/gt/GTVol8/paper8.abs.html

References in corpus (4)

• Heegaard Floer homology and alternating knots
• On the Ozsvath-Szabo invariant of negative definite plumbed 3-manifolds
• On symplectic fillings
• Seifert fibered contact three-manifolds via surgery

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