math/0603445Mar 18, 2006The paper used to be known as "Knot Floer homology detects fibred links", however there was a mistake in the proof of Theorem 1.9 concerning links. The result about knots (Theorem 1.4) and the application to surgeries giving the Poincare' homology sphere (Corollary 1.7), as well as the applications by Ozsvath and Szabo (math.GT/0604079) and Yi Ni (math.GT/0607156) are uneffected by the mistake. This version is essentially the previous one, without Theorem 1.9 and Subsection 4.3. A more revised version is going to appear on Amer. J. Math. and is available on my personal webpage at http://www.labmath.uqam.ca/~ghiggini/papers.html
Knot Floer homology detects genus-one fibred knots
Paolo Ghiggini
Abstract
Ozsvath and Szabo conjectured that knot Floer homology detects fibred knots. We propose a strategy to approach this conjecture based on Gabai's theory of sutured manifold decomposition and contact topology. We implement this strategy for genus-one knots, obtaining as a corollary that, if rational surgery on a knot K gives the Poincare homology sphere Σ(2,3,5), then K is the left-handed trefoil knot.