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arXiv 2302.01871math.AG
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超越GIT的模空间理论指南

A guide to moduli theory beyond GIT

Tomás L. Gómez, Andres Fernández Herrero, Alfonso Zamora

AI总结:

本文综述了利用栈论技术和Θ-分层构造模空间的最新进展,并应用于高维射影簇上主丛的模问题,构造了具有好模空间的不稳定性分层及新的Gieseker型Harder-Narasimhan滤过。

摘要:

在这篇综述中,我们概述了利用栈论技术构造模空间的一些最新进展。我们还将解释一般栈的Harder-Narasimhan分层的类似物,即所谓的Θ-分层。作为这里所阐述思想的一个应用,我们处理了高维射影簇上主丛的模问题,以及其通过所谓的主ρ-层的不同紧化。我们构造了一个按不稳定性类型划分的分层,其低层具有“Gieseker半稳定”对象的适当好模空间,并为这些对象构造了一个新的Gieseker型Harder-Narasimhan滤过。后述结果的详细证明将在其他地方给出。

英文摘要:

In this survey we provide an overview of some recent developments in the construction of moduli spaces using stack-theoretic techniques. We will also explain the analogue of Harder-Narasimhan stratifications for general stacks, known as $Θ$-stratifications. As an application of the ideas exposed here, we address the moduli problem of principal bundles over higher dimensional projective varieties, as well as its different compactifications by the so-called principal $ρ$-sheaves. We construct a stratification by instability types whose lower strata admits a proper good moduli space of ``Gieseker semistable" objects and a new Gieseker-type Harder-Narasimhan filtration for these objects. Detailed proofs of the latter results will appear elsewhere.

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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