Bulletin of the
Korean Mathematical Society BKMS

In this paper, we prove that minimal hypersurfaces when $n\geq 3$ and nonzero constant mean curvature hypersurfaces when $n\geq2$ foliated by spheres in parallel horizontal hyperplanes in ${\mathbb{H}}^n \times \mathbb{R}$ must be rotationally symmetric.

Keywords: foliation, constant mean curvature, rotationally symmetric hypersurface, product space

MSC numbers: 53A10, 53C42