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arXiv math/0001086math.DGmath.GR
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紧Kahler流形的三角de Rham上同调

Triangular de Rham Cohomology of Compact Kahler Manifolds

A. Brudnyi, A. Onishchik

摘要:

研究了取值于李群G的光滑流形M的de Rham 1-上同调H^1_{DR}(M,G).根据定义,这是平凡主丛$M\times G$中的平坦联络集与所谓的规范等价的商。我们考虑的情况下,当M是一个紧凑的Kähler流形和G是一个可解的复线性代数群的一个特殊的类,其中包含的博雷尔子群的所有复杂的典型群,特别是,组$T_n(\Bbb C)$的所有三角形矩阵。在这种情况下,我们得到了集合H^1_{DR}(M,G)的一个描述,即M的1-上同调与某些具有纤维$\frak g$的平坦李代数丛(G的李代数)的平坦截面的(交换)层中的值,或者等价地,用M上表示这个上同调的调和形式。

英文摘要:

We study the de Rham 1-cohomology H^1_{DR}(M,G) of a smooth manifold M with values in a Lie group G. By definition, this is the quotient of the set of flat connections in the trivial principle bundle $M\times G$ by the so-called gauge equivalence. We consider the case when M is a compact Kähler manifold and G is a solvable complex linear algebraic group of a special class which contains the Borel subgroups of all complex classical groups and, in particular, the group $T_n(\Bbb C)$ of all triangular matrices. In this case, we get a description of the set H^1_{DR}(M,G) in terms of the 1-cohomology of M with values in the (abelian) sheaves of flat sections of certain flat Lie algebra bundles with fibre $\frak g$ (the Lie algebra of G) or, equivalently, in terms of the harmonic forms on M representing this cohomology.

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