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arXiv 0711.0465math.DG
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齐次Ricci孤子的通有性质

Generic Properties of Homogeneous Ricci Solitons

Luca Fabrizio Di Cerbo

摘要:

讨论了齐次Ricci孤子的几何性质。在证明了紧致均匀孤子和非紧致稳态均匀孤子的不存在性之后,我们集中研究了左不变Ricci孤子。证明了在幺模情形下,Ricci孤子方程在左不变向量场的集合中不存在解。证明了梯度型左不变孤子必是具有非平凡Euclidean de Rham因子的黎曼积。作为结果的应用,我们证明了任何广义度量Heisenberg李群都是非梯度的膨胀型左不变Ricci孤子.

英文摘要:

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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