Naturality of the contact invariant in monopole Floer homology under strong symplectic cobordisms

Echeverria, Mariano¹

¹Department of Mathematics, University of Virginia, Charlottesville, VA, United States, Department of Mathematics, Rutgers University, Piscataway, NJ, United States

Algebraic and Geometric Topology, Tome 20 (2020) no. 4, pp. 1795-1875

Résumé

The contact invariant is an element in the monopole Floer homology groups of an oriented closed three-manifold canonically associated to a given contact structure. A nonvanishing contact invariant implies that the original contact structure is tight, so understanding its behavior under symplectic cobordisms is of interest if one wants to further exploit this property.

By extending the gluing argument of Mrowka and Rollin to the case of a manifold with a cylindrical end, we will show that the contact invariant behaves naturally under a strong symplectic cobordism.

As quick applications of the naturality property, we give alternative proofs for the vanishing of the contact invariant in the case of an overtwisted contact structure, its nonvanishing in the case of strongly fillable contact structures and its vanishing in the reduced part of the monopole Floer homology group in the case of a planar contact structure. We also prove that a strong filling of a contact manifold which is an L–space must be negative definite.

Détail

DOI : 10.2140/agt.2020.20.1795

Classification : 57R17, 57R58
Keywords: contact invariant, monopole Floer homology

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