Abstract
In this paper, we study hypersurfaces with constant rth mean curvature S r . We investigate the stability of such hypersurfaces in the case when they are leaves of a codimension one foliation. We also generalize recent results by Barros and Sousa, concerning conformal fields, to an arbitrary manifold. Using this we show that normal component of a Killing field is an rth Jacobi field of a hypersurface with S r + 1 constant. Finally, we study relations between rth Jacobi fields and vector fields preserving a foliation.
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