Height estimates for surfaces with some constant curvature in $\mathbb{r} \times_{f} \mathbb{r}^{2}$

Abstract

In this paper, we obtain the necessary equations in a conformal parameter induced by the first or second fundamental forms for a surface that is isometrically immersed in the warped product $\mathbb{R} \times_{f} \mathbb{M}^{2}(\kappa)$ where $\mathbb{M}^{2}(\kappa)$ denotes the complete, connected, simply connected, two-dimensional space form of constant curvature. The surface we will consider has either positive extrinsic curvature or positive mean curvature. In each case, we carry out some geometric applications to the theory of constant curvature surfaces immersed in $\mathbb{R} \times_{f} \mathbb{R}^{2}$ under certain conditions on the warping function $f$. Specifically, we derive height estimates for graph-type surfaces with either positive constant extrinsic curvature or positive constant mean curvature. In particular, we classify compact minimal graphs in such warped products. This article extends previous work on the study of constant curvature surfaces immersed in product spaces using conformal parameters, as well as the height estimates for constant curvature surfaces in the warped product $\mathbb{R} \times_{f} \mathbb{R}^{2}$.