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Instanton Floer homology with Lagrangian boundary conditions

Dietmar Salamon and Katrin Wehrheim

Geometry and Topology 12 (2008) 747–918

DOI: 10.2140/gt.2008.12.747


In this paper we define instanton Floer homology groups for a pair consisting of a compact oriented 3–manifold with boundary and a Lagrangian submanifold of the moduli space of flat SU(2)–connections over the boundary. We carry out the construction for a general class of irreducible, monotone boundary conditions. The main examples of such Lagrangian submanifolds are induced from a disjoint union of handle bodies such that the union of the 3–manifold and the handle bodies is an integral homology 3–sphere. The motivation for introducing these invariants arises from our program for a proof of the Atiyah–Floer conjecture for Heegaard splittings. We expect that our Floer homology groups are isomorphic to the usual Floer homology groups of the closed 3–manifold in our main example and thus can be used as a starting point for an adiabatic limit argument.


3-manifold with boundary, Atiyah-Floer conjecture

Mathematical Subject Classification

Primary: 57R58

Secondary: 58J32


Received: 19 July 2006
Accepted: 10 December 2007
Published: 12 May 2008
Proposed: Tom Mrowka
Seconded: Simon Donaldson, Eleny Ionel

Dietmar Salamon
Department of Mathematics
8092 Zürich
Katrin Wehrheim
Massachusetts Institute of Technology
Department of Mathematics
77 Massachusetts Avenue
Cambridge, MA 02139-4307