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北美退伍军人节(Veterans Day),12 日无更新
arXiv 1012.2048math.DGhep-th
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多矩映射

Multi-moment maps

Thomas Bruun Madsen, Andrew Swann

摘要:

我们引入了一个概念的矩映射适应行动的李群,保持一个封闭的三形式。我们在许多情况下,我们的多矩映射的存在性,包括温和的拓扑假设的基础流形。这样的映射也存在于第二和第三李代数贝蒂数为零的所有群。我们表明,这些形式的一类特殊的可解李群,并提供了一个结构特征。我们给出了许多不同几何的多矩映射的例子,并用它们来描述四维流形的三辛几何中的包含在G_2中的具有两环面对称性的完整性的流形。

英文摘要:

We introduce a notion of moment map adapted to actions of Lie groups that preserve a closed three-form. We show existence of our multi-moment maps in many circumstances, including mild topological assumptions on the underlying manifold. Such maps are also shown to exist for all groups whose second and third Lie algebra Betti numbers are zero. We show that these form a special class of solvable Lie groups and provide a structural characterisation. We provide many examples of multi-moment maps for different geometries and use them to describe manifolds with holonomy contained in G_2 preserved by a two-torus symmetry in terms of tri-symplectic geometry of four-manifolds.

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