Four dimensional hypersurfaces with proper mean curvature vector field in pseudo-Riemannian space forms

Chao Yang, Jiancheng Liu, Li Du

In this paper, we study four dimensional hypersurface M^4_r with proper mean curvature vector field (i.e. Δ\vec{H} is proportional to \vec{H}) in pseudo-Riemannian space form N^5_s…