Mathematics – Geometric Topology
Scientific paper
2006-11-16
Mathematics
Geometric Topology
Edited to reflect referee's suggestions; expanded section 4 including exposition of universal coefficients spectral sequence.
Scientific paper
Motivated by conjectures in Heegaard Floer homology, we introduce an invariant HC(Y) of the cohomology ring of a closed 3-manifold Y whose behavior mimics that of the Heegaard Floer homology HF^\infty(Y,s) for s a torsion spin-c structure. We derive from this a numerical invariant h(Y), and obtain upper and lower bounds on h(Y). We describe the behavior of h(Y) under connected sum, and deduce some topological consequences. Examples show that the structure of HC(Y) can be surprisingly complicated, even for 3-manifolds with comparatively simple cohomology rings.
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