  In this paper, we study semi-slant submanifolds and their warped products in
Kenmotsu manifolds. The existence of such warped products in Kenmotsu manifolds
is shown by an example and a characterization. A sharp relation is obtained as
a lower bound of the squared norm of second fundamental form in terms of the
warping function and the slant angle. The equality case is also considered in
this paper. Finally, we provide some applications of our derived results.

Differential Geometry