Sasakian metrics with an additional contact structure
arXiv:1212.6581
Abstract
The question of whether a Sasakian metric can admit an additional compatible (K-)contact structure is addressed. In the complete case if the second structure is also assumed Sasakian, works of Tachibana-Yu and Tanno show that the manifold must be 3-Sasakian or an odd dimensional sphere with constant curvature. Some extensions of this result are obtained, mainly in dimensions 3 and 5.
To appear in a special volume honoring Prof. Augustin Banyaga in the African Diaspora Journal of Mathematics