Splitting theorems on complete manifolds with Bakry-\'Emery curvature
  In this paper we study some splitting properties on complete noncompact manifolds with smooth measures when $\infty$-dimensional Bakry-\'Emery Ricci curvature is bounded from below by some negative constant and spectrum of the weighted Laplacian has a positive lower bound. These results extend the cases of Ricci curvature and $m$-dimensional Bakry-\'Emery Ricci curvature. 
Jia-Yong Wu
math.DG