Generic Properties of Homogeneous Ricci Solitons

Details Generic Properties of Homogeneous Ricci Solitons Generic Properties of Homogeneous Ricci Solitons

2007-11-03

arxiv.org/abs/0711.0465v2

Mathematics

Differential Geometry

An incorrect sentence deleted. Several typos and a reference corrected. Added acknowledgments

Scientific paper

We discuss the geometry of homogeneous Ricci solitons. After showing the nonexistence of compact homogeneous and noncompact steady homogeneous solitons, we concentrate on the study of left invariant Ricci solitons. We show that, in the unimodular case, the Ricci soliton equation does not admit solutions in the set of left invariant vector fields. We prove that a left invariant soliton of gradient type must be a Riemannian product with a nontrivial Euclidean de Rham factor. As an application of our results we prove that any generalized metric Heisenberg Lie group is a nongradient left invariant Ricci soliton of expanding type.

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