Sur la torsion des structures de contact tendues
Sur la torsion des structures de contact tendues
Thanks to torsion, an invariant introduced by E. Giroux, we give a sufficient topological condition for a 3-manifold to carry infinitely many non-isomorphic tight contact structures.It is for example the case of every orientable Seifert fibered space over a surface of genus g 1.We also prove a rigidity result for …