Project supported by the National Natural Science Foundation of China(Nos.10971055,11171096);the Research Fund for the Doctoral Program of Higher Education of China(No.20104208110002);the Funds for Disciplines Leaders of Wuhan(No.Z201051730002)
In this paper, the relationship between the existence of closed geodesics and the volume growth of complete noncompact Riemannian manifolds is studied. First the authors prove a diffeomorphic result of such an n-m2nif...