RT Journal Article T1 Simply connected K-contact and Sasakian manifolds of dimension 7 A1 Muñoz, Vicente A1 Tralle, Aleksy AB We construct a compact simply-connected 7-dimensional manifold admitting a K-contact structure but not a Sasakian structure. We also study rational homotopy properties of such manifolds, proving in particular that a simply-connected 7-dimensional Sasakian manifold has vanishing cup-product on the second cohomology and that it is formal if and only if all its triple Massey products vanish. PB Springer SN 0025-5874 YR 2015 FD 2015 LK https://hdl.handle.net/20.500.14352/34868 UL https://hdl.handle.net/20.500.14352/34868 LA eng DS Docta Complutense RD 30 abr 2024