On Negatively Curved Finsler Manifolds of Scalar Curvature

In this paper, we prove a global rigidity theorem for negatively curved Finsler metrics on a compact manifold of dimensionn≥ 3. We show that for such a Finsler manifold, if the flag curvature is a scalar function on the tangent bundle, then the Finsler metric is of Randers type. We also study the case when the Finsler metric is locally projectively flat.