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arXiv 1110.1998math.DGgr-qchep-th
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如何找到洛伦兹流形的完整代数

How to find the holonomy algebra of a Lorentzian manifold

Anton S. Galaev

摘要:

具有例外完整性的流形在弦论、超引力和M-理论中起着重要的作用。它解释了如何可以找到一个任意的黎曼流形或洛伦兹流形的holonomy代数。利用de~Rham分解和Wu分解,将该问题归结为局部不可分解流形的情形.在局部不可分解的黎曼流形的情况下,通过对流形上特殊几何结构的分析,可以得到完整代数。如果维数为$n$的局部不可分解洛伦兹流形$(M,g)$的完整代数$\mathfrak{g}\subset\mathfrak{so}(1,n-1)$不同于$\mathfrak{so}(1,n-1)$,则它包含在相似代数$\mathfrak{sim}(n-2)$中.有4种类型的这样的holonomy代数。给出了寻找$\mathfrak{g}$类型的判据,并描述了每种类型对应的特殊几何结构。每个$\mathfrak{g}$都有一个正则相关的子代数$\mathfrak{h}\subset\mathfrak{so}(n-2)$。给出了一种求$\mathfrak{h}$的算法。

英文摘要:

Manifolds with exceptional holonomy play an important role in string theory, supergravity and M-theory. It is explained how one can find the holonomy algebra of an arbitrary Riemannian or Lorentzian manifold. Using the de~Rham and Wu decompositions, this problem is reduced to the case of locally indecomposable manifolds. In the case of locally indecomposable Riemannian manifolds, it is known that the holonomy algebra can be found from the analysis of special geometric structures on the manifold. If the holonomy algebra $\mathfrak{g}\subset\mathfrak{so}(1,n-1)$ of a locally indecomposable Lorentzian manifold $(M,g)$ of dimension $n$ is different from $\mathfrak{so}(1,n-1)$, then it is contained in the similitude algebra $\mathfrak{sim}(n-2)$. There are 4 types of such holonomy algebras. Criterion how to find the type of $\mathfrak{g}$ are given, and special geometric structures corresponding to each type are described. To each $\mathfrak{g}$ there is a canonically associated subalgebra $\mathfrak{h}\subset\mathfrak{so}(n-2)$. An algorithm how to find $\mathfrak{h}$ is provided.

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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