Pinching theorems for totally real minimal submanifolds in cpn

Abstract

Let M be an n-dimensional totally real minimal submanifold in CPn. We prove that if M is semi-parallel and the scalar curvature tau, -(n-1)(n-2)(n+1)/2 <= tau <= 0, then M is an open part of the Clifford torus T-n subset of CPn. If M is semi-parallel and the scalar curvature tau, n(n - 1) <= tau <= n(3)-3n+2/2, then M is an open part of the real projective space RPn.