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arXiv 1709.08620math.QA
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hom-Lie色代数的扩张

Extensions of hom-Lie color algebras

A. R. Armakan, S. Silvestrov, M. R. Farhangdoost

摘要:

本文研究了给定的hom-Lie色代数的(非Abel)扩张,并给出了扩张的几何解释。特别地,我们刻画了一个hom-李代数$\mathfrak{g}$被另一个hom-李代数$\mathfrak{h}$扩张的特征,并讨论了$\mathfrak{h}$没有中心的情形.我们还讨论了协变外导数,Chevalley导数,曲率和Bianchi恒等式在微分几何中的可能扩张的设置。此外,我们发现了一个上同调的障碍,即hom-Lie色代数的扩张的存在性。e.我们证明了要有一个可扩的hom-Lie色代数,就必须存在一个平凡的第三上同调成员。

英文摘要:

In this paper we study (non-Abelian) extensions of a given hom-Lie color algebra and provide a geometrical interpretation of extensions. In particular, we characterize an extension of a hom-Lie algebra $\mathfrak{g}$ by another hom-Lie algebra $\mathfrak{h}$ and we discuss the case where $\mathfrak{h}$ has no center. We also deal with the setting of covariant exterior derivatives, Chevalley derivative, curvature and the Bianchi identity for the possible extensions in differential geometry. Moreover, we find a cohomological obstruction to the existence of extensions of hom-Lie color algebras, i. e. we show that in order to have an extendible hom-Lie color algebra, there should exist a trivial member of the third cohomology.

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