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arXiv 0811.1949math.AGmath.AC
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射影Deligne-Mumford栈上半稳定层的模空间

Moduli Spaces of Semistable Sheaves on Projective Deligne-Mumford Stacks

Fabio Nironi

摘要:

在Olsson和Starr \cite{MR2007396}的意义下,引入了Deligne-Mumford栈上相干层的Gieseker稳定性的概念.我们证明了这个稳定性条件是开的,并且纯维半稳定层形成一个有界族。我们明确地构造了半稳定层的模栈作为有限型整体商,并研究了稳定层的模方案及其自然紧化,其精神与Simpson \cite{MR1307297}的开创性论文相同.有了这个一般机制,我们能够检索,作为特殊情况下,Lieblich \cite{MR2309155}和Yoshioka \cite{MR2306170}的扭曲层的模量和抛物稳定性介绍了丸山横河在\cite{MR1162674}。

英文摘要:

We introduce a notion of Gieseker stability for coherent sheaves on tame Deligne-Mumford stacks with projective moduli scheme and some chosen generating sheaf on the stack in the sense of Olsson and Starr \cite{MR2007396}. We prove that this stability condition is open, and pure dimensional semistable sheaves form a bounded family. We explicitly construct the moduli stack of semistable sheaves as a finite type global quotient, and study the moduli scheme of stable sheaves and its natural compactification in the same spirit as the seminal paper of Simpson \cite{MR1307297}. With this general machinery we are able to retrieve, as special cases, results of Lieblich \cite{MR2309155} and Yoshioka \cite{MR2306170} about moduli of twisted sheaves and parabolic stability introduced by Maruyama-Yokogawa in \cite{MR1162674}.

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