Abstract
Starting from a Heegaard splitting of a three-manifold, we use Lagrangian Floer homology to construct a three-manifold invariant in the form of a relatively \(\mathbb{Z}/8\mathbb{Z}\)-graded abelian group. Our motivation is to have a well-defined symplectic side of the Atiyah–Floer conjecture for arbitrary three-manifolds. The symplectic manifold used in the construction is the extended moduli space of flat SU (2)-connections on the Heegaard surface. An open subset of this moduli space carries a symplectic form, and each of the two handlebodies in the decomposition gives rise to a Lagrangian inside the open set. In order to define their Floer homology, we compactify the open subset by symplectic cutting; the resulting manifold is only semipositive, but we show that one can still develop a version of Floer homology in this setting.
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A subset of a topological space is comeager if it is the intersection of countably many open dense subsets. Many authors use the term “Baire second category,” which, however, denotes more generally subsets that are not meager, i.e., not the complement of a comeager subset. See, for example, [48, Chap. 7.8].
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Acknowledgments
We would like to thank Yasha Eliashberg, Peter Kronheimer, Peter Ozsváth, Tim Perutz, and Michael Thaddeus for some very helpful discussions during the preparation of this paper. Especially, we would like to thank Ryszard Rubinsztein for pointing out an important mistake in an earlier version of this paper (in which topological invariance was stated as a conjecture).
The first author was partially supported by NSF grant DMS-0852439 and a Clay Research Fellowship. The second author was partially supported by the NSF grants DMS-060509 and DMS-0904358.
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Manolescu, C., Woodward, C. (2012). Floer Homology on the Extended Moduli Space. In: Itenberg, I., Jöricke, B., Passare, M. (eds) Perspectives in Analysis, Geometry, and Topology. Progress in Mathematics, vol 296. Birkhäuser, Boston, MA. https://doi.org/10.1007/978-0-8176-8277-4_13
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