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arXiv 2107.10482math.AGmath.CV
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局部系统全纯族的特征形式

Characteristic forms for holomorphic families of local systems

Indranil Biswas, Eduard Looijenga

AI总结:

本文通过加细 Chern–Weil 同态,为带平坦主丛联络的紧复流形全纯族构造特征形式,并在曲面纤维情形恢复 Goldman 的闭全纯二形式。

摘要:

设 $f:\mathcal{X}\to S$ 为复流形之间的真全纯淹没,$G$ 为复约化线性代数群,其 Lie 代数为 $\mathfrak{g}$。还假设在 $\mathcal{X}$ 上给定一个全纯主 $G$-丛 $\mathcal{P}$,并赋予其相对于 $f$ 的平坦全纯联络 $\nabla$(这可视为一族紧复流形的全纯族,每个流形带有一个配备平坦联络的全纯主 $G$-丛)。我们证明,Chern–Weil 同态的一种加细给出分次代数同态 $\mathbb{C}[\mathfrak{g}]^G\to \bigoplus_{n\ge 0} H^0(S,\\,Ω^n_{S,cl}\otimes R^nf_*\mathbb{C})$,其中 $Ω^n_{S,cl}$ 表示 $S$ 上闭全纯 $n$-形式的层。若 $f$ 的纤维是紧 Riemann 曲面,并取 Killing 型作为不变量,则我们恢复 Goldman 在基 $S$ 上的闭全纯 $2$-形式。

英文摘要:

Let $f:\mathcal{X}\to S$ be a proper holomorphic submersion of complex manifolds and $G$ a complex reductive linear algebraic group with Lie algebra $\mathfrak{g}$. Assume also given a holomorphic principal $G$-bundle $\mathcal{P}$ over $\mathcal{X}$ which is endowed with a holomorphic connection $\nabla$ relative to $f$ that is flat (this to be thought of as a holomorphic family of compact complex manifolds endowed with a holomorphic principal $G$-bundle with flat connection). We show that a refinement of the Chern-Weil homomorphism yields a graded algebra homomorphism $\mathbb{C}[\mathfrak{g}]^G\to \bigoplus_{n\ge 0} H^0(S,\,Ω^n_{S,cl}\otimes R^nf_*\mathbb{C})$, where $Ω^n_{S,cl}$ stands for the sheaf of closed holomorphic $n$-forms on $S$. If the fibers of $f$ are compact Riemann surfaces and we take as our invariant the Killing form, then we recover Goldman's closed holomorphic $2$-form on the base $S$.

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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