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Bimodules in bordered Heegaard Floer homology

Robert Lipshitz, Peter S Ozsváth and Dylan P Thurston

Geometry & Topology 19 (2015) 525–724

Bordered Heegaard Floer homology is a three-manifold invariant which associates to a surface F an algebra A(F) and to a three-manifold Y with boundary identified with F a module over A(F). In this paper, we establish naturality properties of this invariant. Changing the diffeomorphism between F and the boundary of Y tensors the bordered invariant with a suitable bimodule over A(F). These bimodules give an action of a suitably based mapping class group on the category of modules over A(F). The Hochschild homology of such a bimodule is identified with the knot Floer homology of the associated open book decomposition. In the course of establishing these results, we also calculate the homology of A(F). We also prove a duality theorem relating the two versions of the 3–manifold invariant. Finally, in the case of a genus-one surface, we calculate the mapping class group action explicitly. This completes the description of bordered Heegaard Floer homology for knot complements in terms of the knot Floer homology.

Floer homology, $3$–manifolds, Heegaard diagrams, mapping class group, Hochschild homology
Mathematical Subject Classification 2010
Primary: 57R57
Secondary: 53D40
Received: 1 July 2011
Revised: 23 April 2014
Accepted: 5 June 2014
Published: 10 April 2015
Proposed: Yasha Eliashberg
Seconded: Ciprian Manolescu, Tomasz Mrowka
Correction: 13 March 2024
Robert Lipshitz
Department of Mathematics
Columbia University
MC 4425
2990 Broadway
New York, NY 10027
Peter S Ozsváth
Department of Mathematics
Princeton University
Fine Hall, Washington Road
Princeton, NY 08540
Dylan P Thurston
Department of Mathematics
Indiana University
831 E Third St
Bloomington, NY 47405