Rigidity of volume-minimizing free boundary hypersurfaces in high dimensional Riemannian manifolds

In this paper, we establish a volume estimate and an associated rigidity result for volume-minimizing free boundary hypersurfaces in an $(n+1)$-dimensional Riemannian manifold $M$. First, we derive a volume estimate for stable minimal free boundary hypersurfaces in terms of the scalar curvature of $M$ and the second fundamental form of the boundary $\mathrm{\partial }M$. We then prove rigidity results of $M$ in the corresponding equality cases.