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arXiv 0802.2137math.DG
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Einstein解流形与Pre-Einstein导子

Einstein solvmanifolds and the pre-Einstein derivation

Y. Nikolayevsky

摘要:

爱因斯坦零根是幂零李代数,它可以是度量爱因斯坦可解李代数的零根。黎曼爱因斯坦解流形的分类(可能是所有非紧齐次爱因斯坦空间的分类)可以归结为确定哪些幂零李代数是爱因斯坦零根,并找到每个爱因斯坦零根的爱因斯坦度量可解扩张。对于每一个幂零李代数,我们构造一个(本质上唯一的)导子,前爱因斯坦导子,可解的扩展,其中可以携带爱因斯坦内积。利用pre-Einstein推导,我们给出了Einstein诣零根的变分刻画。作为应用,我们证明了一个易于检验的凸几何条件,证明了具有良好基的幂零李代数是Einstein零根,并证明了一个典型的两步幂零李代数是Einstein零根.

英文摘要:

An Einstein nilradical is a nilpotent Lie algebra, which can be the nilradical of a metric Einstein solvable Lie algebra. The classification of Riemannian Einstein solvmanifolds (possibly, of all noncompact homogeneous Einstein spaces) can be reduced to determining, which nilpotent Lie algebras are Einstein nilradicals and to finding, for every Einstein nilradical, its Einstein metric solvable extension. For every nilpotent Lie algebra, we construct an (essentially unique) derivation, the pre-Einstein derivation, the solvable extension by which may carry an Einstein inner product. Using the pre-Einstein derivation, we then give a variational characterization of Einstein nilradicals. As an application, we prove an easy-to-check convex geometry condition for a nilpotent Lie algebra with a nice basis to be an Einstein nilradical and also show that a typical two-step nilpotent Lie algebra is an Einstein nilradical.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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