Sphere-foliated minimal and constant mean curvature hypersurfaces in product spaces

Abstract

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.Comment: This article is to appear in Bull. Korean Math. Soc. in 201