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arXiv 0902.1698math.DG
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Einstein和非Einstein零根的模

Moduli of Einstein and non-Einstein nilradicals

Michael Jablonski

摘要:

本文研究了幂零李群中的Einstein和非Einstein零根的分布。一个幂零的李群被称为爱因斯坦群。非Einstein,零根,如果它是一个幂零李群,分别是不承认左不变的Ricci孤子度量。利用几何不变理论中的技巧,我们构造了许多新的(连续的)两类幂零李群族。此外,它是通过例子表明,存在家庭的非爱因斯坦nilradicals任意大的尺寸,这些家庭的李群的尺寸只取决于基本的李群的尺寸。在这项工作中,我们的注意力集中在类的两步幂零李群。

英文摘要:

In this note we are concerned with the distribution of Einstein and non-Einstein nilradicals among all nilpotent Lie groups. A nilpotent Lie group is called an Einstein, resp. non-Einstein, nilradical if it is a nilpotent Lie group which does, resp. does not, admit a left-invariant Ricci soliton metric. Using techniques from Geometric Invariant Theory, we construct many new (continuous) families of both kinds of nilpotent Lie groups. Moreover, it is shown by example that there exist families of non-Einstein nilradicals of arbitrarily large dimension; the dimension of these families of Lie groups depends only on the dimension of the underlying Lie groups. In this work our attention is focused on the class of two-step nilpotent Lie groups.

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