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arXiv 1508.00539math.AG
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几乎阶乘整环与Mori dream空间的谱商

Quotients of spectra of almost factorial domains and Mori dream spaces

Marcel Maslovarić

摘要:

证明了仿射簇$X=Spec(A)$与约化群$G$(其中$A$是几乎阶乘整环)的GIT chamber商是Mori梦空间,如果它是投射的,则不考虑不稳定轨迹的余维.这包括一个明确的描述皮卡德数,pseudoeffective锥,和森商会在GIT方面。我们将结果应用于λ模,表明它们是Mori梦空间,如果λ模不包含定向圈,如果稳定性和半稳定性一致。我们给出了Picard数的一个公式。作为第二个应用,我们证明了Mori梦空间的几何等价物也是Mori梦空间,这又包括了Picard数和Mori chamber的描述。最后给出了一些例子来说明结果。

英文摘要:

We prove that a GIT chamber quotient of an affine variety $X=Spec(A)$ by a reductive group $G$, where $A$ is an almost factorial domain, is a Mori dream space if it is projective, regardless of the codimension of the unstable locus. This includes an explicit description of the Picard number, the pseudoeffective cone, and the Mori chambers in terms of GIT. We apply the results to quiver moduli, to show that they are Mori dream spaces if the quiver contains no oriented cycles, and if stability and semistability coincide. We give a formula for the Picard number in quiver terms. As a second application we prove that geometric quotients of Mori dream spaces are Mori dream spaces as well, which again includes a description of the Picard number and the Mori chambers. Some examples are given to illustrate the results.

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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