Non‐Commutative Coordinate Rings and Stacks

Non‐Commutative Coordinate Rings and Stacks
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非交换坐标环和堆栈

DOI:
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发表时间:
2004
期刊:
影响因子:
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通讯作者:
C. Ingalls
C. Ingalls
中科院分区:
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文献类型:
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作者:
D. Chan;C. Ingalls

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设Y <$X是一个有限平坦广群概型,X是一个拟投射簇,S是它的粗模概型。我们将S上的代数OX/Y的凝聚层与广群概型联系起来,我们称之为广群概型的非交换坐标环。我们证明了当X是光滑曲线且群胚作用是一般自由的时,在Morita等价条件下,可能出现的非交换坐标环是光滑曲线上的遗传阶。这给出了有限型的光滑一维Deligne-Mumford栈和光滑曲线上遗传阶的Morita等价类之间的双射对应。2000年数学学科分类14 A22、16 S38、14 A20。
Let Y ⇉ X be a finite flat groupoid scheme with X a quasi‐projective variety and let S be its coarse moduli scheme. We associate to the groupoid scheme a coherent sheaf of algebras OX/Y on S which we call the non‐commutative coordinate ring of the groupoid scheme. We show that when X is a smooth curve and the groupoid action is generically free, the non‐commutative coordinate rings which can occur are, up to Morita equivalence, the hereditary orders on smooth curves. This gives a bijective correspondence between smooth one‐dimensional Deligne–Mumford stacks of finite type and Morita equivalence classes of hereditary orders on smooth curves. 2000 Mathematics Subject Classification 14A22, 16S38, 14A20.