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arXiv 0811.1955math.AGmath.AC
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Deligne-Mumford Stacks的Grothendieck对偶

Grothendieck Duality for Deligne-Mumford Stacks

Fabio Nironi

摘要:

我们证明了存在的对偶函子的分离态射的代数堆栈与仿射对角线,然后我们明确开发的对偶紧凑Deligne-Mumford堆栈集中在特别是从堆栈的态射,其粗模空间和可表示的态射。我们显式计算的对偶复杂的代数闭域上的光滑堆栈,并证明了Serre对偶持有光滑紧凑Deligne-Mumford堆栈在其通常的形式。我们还证明了一个适当的Cohen-Macaulay堆栈有一个对偶层,它是一个可逆层时,它是Gorenstein。作为这一一般机制的应用,我们计算驯服节曲线的对偶层。

英文摘要:

We prove the existence of the dualizing functor for a separated morphism of algebraic stacks with affine diagonal; then we explicitly develop duality for compact Deligne-Mumford stacks focusing in particular on the morphism from a stack to its coarse moduli space and on representable morphisms. We explicitly compute the dualizing complex for a smooth stack over an algebraically closed field and prove that Serre duality holds for smooth compact Deligne-Mumford stacks in its usual form. We prove also that a proper Cohen-Macaulay stack has a dualizing sheaf and it is an invertible sheaf when it is Gorenstein. As an application of this general machinery we compute the dualizing sheaf of a tame nodal curve.

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