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arXiv 0904.2797math.AG
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稳定的品种与扭曲

Stable varieties with a twist

Dan Abramovich, Brendan Hassett

摘要:

我们描述了一种新的方法来定义的模函子的稳定品种。虽然有广泛的协议,以什么类的品种应该出现,一个家庭的稳定表面的概念是相当微妙的,因为关键的数值不变量可能无法在平坦的家庭是常数。我们的方法是将自然堆栈结构添加到稳定变量中。例如,给定一个正则模型,我们将其实现所产生的全局商栈结构作为正则环的Proj。堆栈结构的变形保留了稳定变量的关键数值不变量,包括典范除子的顶部自相交。这种方法产生一个透明的建设的模栈稳定品种作为一个全球性的商合适的希尔伯特计划加权投影堆栈。

英文摘要:

We describe a new approach to the definition of the moduli functor of stable varieties. While there is wide agreement as to what classes of varieties should appear, the notion of a family of stable surfaces is quite subtle, as key numerical invariants may fail to be constant in flat families. Our approach is to add natural stack structure to stable varieties. For example, given a canonical model we take the global-quotient stack structure arising from its realization as Proj of the canonical ring. Deformations of the stack structure preserve key numerical invariants of the stable variety, including the top self-intersection of the canonical divisor. This approach yields a transparent construction of the moduli stack of stable varieties as a global quotient of a suitable Hilbert scheme of weighted projective stacks.

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