Given a contact structure on a closed, oriented three-manifold Y, we describe an invariant that takes values in the three-manifold's Floer homology HF. This invariant vanishes for overtwisted contact structures and is nonzero for Stein-fillable ones. The construction uses Giroux's interpretation of contact structures in terms of open-book decompositions.
机构:
Moscow MV Lomonosov State Univ, Moscow, Russia
Natl Res Univ, Higher Sch Econ, Int Lab Representat Theory & Math Phys, Moscow, Russia
Univ Calif Davis, Davis, CA 95616 USAMoscow MV Lomonosov State Univ, Moscow, Russia