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arXiv 1707.06385math.DG
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仿射齐性空间的模空间

Moduli Spaces of Affine Homogeneous Spaces

Gregor Weingart

摘要:

除了全局拓扑问题外,仿射齐性空间还可以用它的曲率、挠率和一个在给定基点上的称为联络的稍微不那么有形的对象来局部描述。使用这种描述的局部几何的仿射齐性空间,我们构建了一个代数品种$\mathfrak{M}(\mathfrak{gl}\,V)$,它作为一个粗糙的模空间的局部等距类的仿射齐性空间的维度dimV。此外,我们将一个$\mathrm{Sym}V^*$ -comomosium的一个点在$\mathfrak{M}(\mathfrak{gl}\,V\,)$和使用其斯宾塞上同调,以描述无穷小变形的这一点在真正的模空间$\mathfrak{M}_\infty(\mathfrak{gl}\,V\,)$。

英文摘要:

Apart from global topological problems an affine homogeneous space is locally described by its curvature, its torsion and a slightly less tangible object called its connection in a given base point. Using this description of the local geometry of an affine homogeneous space we construct an algebraic variety $\mathfrak{M}(\mathfrak{gl}\,V)$, which serves as a coarse moduli space for the local isometry classes of affine homogeneous spaces of dimension dim V. Moreover we associate a $\mathrm{Sym}V^*$-comodule to a point in $\mathfrak{M}(\mathfrak{gl}\,V\,)$ and use its Spencer cohomology in order to describes the infinitesimal deformations of this point in the true moduli space $\mathfrak{M}_\infty(\mathfrak{gl}\,V\,)$.

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