In this paper, we focus on a conformally flat Riemannian manifold $(M^n,g)$ of dimension $n$ isometrically immersed into the $(n+1)$-dimensional light-cone $\Lambda^{ n+1}$ as a hypersurface. We compute the first and the second variational formulas on the volume of such hypersurfaces. Such a hypersurface $M^n$ is not only immersed in $\Lambda^{ n+1}$ but also isometrically realized as a hypersurface of a certain null hypersurface $N^{ n+1}$ in the Minkowski spacetime, which is different from $\Lambda^{ n+1}$. Moreover, $M^n$ has a volume-maximizing property in $N^{ n+1}$.
Categories: math.DG