Anti-quasi-Sasakian manifolds

We introduce and study a special class of almost contact metric manifolds, which we call anti-quasi-Sasakian (aqS). Among the class of transversely Kähler almost contact metric manifolds $(M,\phi ,\xi ,\eta ,g)$, quasi-Sasakian and anti-quasi-Sasakian manifolds are characterized, respectively, by the $\phi$-invariance and the $\phi$-anti-invariance of the $2$-form $d\eta$. A Boothby-Wang type theorem allows to obtain aqS structures on principal circle bundles over Kähler manifolds endowed with a closed $(2,0)$-form. We characterize aqS manifolds with constant $\xi$-sectional curvature equal to $1$: they admit an $Sp(n)\times 1$-reduction of the frame bundle such that the manifold is transversely hyperkähler, carrying a second aqS structure and a null Sasakian $\eta$-Einstein structure. We show that aqS manifolds with constant sectional curvature are necessarily flat and cokähler. Finally, by using a metric connection with torsion, we provide a sufficient condition for an aqS manifold to be locally decomposable as the Riemannian product of a Kähler manifold and an aqS manifold with structure of maximal rank. Under the same hypothesis, $(M,g)$ cannot be locally symmetric.