Complete Shrinking Ricci Solitons have Finite Fundamental Group

Details Complete Shrinking Ricci Solitons have Finite Fundamental Group Complete Shrinking Ricci Solitons have Finite Fundamental Group

2007-04-03

arxiv.org/abs/0704.0317v1

Mathematics

Differential Geometry

4 pages, To appear in Proceedings of AMS

Scientific paper

We show that if a complete Riemannian manifold supports a vector field such that the Ricci tensor plus the Lie derivative of the metric with respect to the vector field has a positive lower bound, then the fundamental group is finite. In particular, it follows that complete shrinking Ricci solitons and complete smooth metric measure spaces with a positive lower bound on the Bakry-Emery tensor have finite fundamental group. The method of proof is to generalize arguments of Garcia-Rio and Fernandez-Lopez in the compact case.

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