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arXiv 0802.1822math.AGmath.DG
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二秩s-Kähler流形上的自然李代数丛、曲线的阿贝尔簇和模

Natural Lie Algebra bundles on rank two s-Kähler manifolds, abelian varieties and moduli of curves

Giovanni Gaiffi, Michele Grassi

摘要:

本文证明了在秩为2的s-Kähler流形上可以得到纤维同构于so(s+1,s+1),su(s+1,s +1)和sl(2s + 2,\R)的李代数的自然丛.在最严格的情况下(包括复环面和阿贝尔簇),这些丛有自然的平坦联络,其平坦的整体瓣自然地作用于上同调。我们还提出了几个自然的例子流形,可以配备一个s-Kähler结构与不同程度的刚性:复杂的环面和阿贝尔簇,余切束的光滑流形和模量的点椭圆曲线。

英文摘要:

We prove that one can obtain natural bundles of Lie algebras on rank two s-Kähler manifolds, whose fibres are isomorphic to so(s+1,s+1), su(s+1,s+1) and sl(2s + 2,\R). In the most rigid case (which includes complex tori and abelian varieties) these bundles have natural flat connections, whose flat global sections act naturally on cohomology. We also present several natural examples of manifolds which can be equipped with an s-Kähler structure with various levels of rigidity: complex tori and abelian varieties, cotangent bundles of smooth manifolds and moduli of pointed elliptic curves.

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