Knot Floer homology and rational surgeries

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141 Scopus citations


Let K be a rationally null-homologous knot in a three-manifold Y. We construct a version of knot Floer homology in this context, including a description of the Floer homology of a three-manifold obtained as Morse surgery on the knot K. As an application, we express the Heegaard Floer homology of rational surgeries on Y along a null-homologous knot K in terms of the filtered homotopy type of the knot invariant for K. This has applications to Dehn surgery problems for knots in S3. In a different direction, we use the techniques developed here to calculate the Heegaard Floer homology of an arbitrary Seifert fibered three-manifold with even first Betti number.

Original languageEnglish (US)
Pages (from-to)1-68
Number of pages68
JournalAlgebraic and Geometric Topology
Issue number1
StatePublished - 2011

All Science Journal Classification (ASJC) codes

  • Geometry and Topology


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