The intrinsic normal cone

The intrinsic normal cone
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DOI:
10.1007/s002220050136
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发表时间:
1996-01
影响因子:
3.1
通讯作者:
K. Behrend;B. Fantechi
K. Behrend;B. Fantechi
中科院分区:
数学1区
文献类型:
--
作者:
K. Behrend;B. Fantechi

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让我们在delign - mumford意义上建立一个代数堆栈。我们在(在Artin的意义上)内禀法向锥上构造了一个纯维代数堆栈。引入了(完全)阻塞理论的概念,并给出了对的Chow群中的一个纯维虚基本类的完全阻塞理论,给出了如何构造。然后我们在绝对和相对上下文中证明了这些类的一些性质。通过对阻碍理论的变形理论解释,证明了几种模空间携带一个自然的阻碍理论,有时是一个完美的阻碍理论。
Letbe an algebraic stack in the sense of Deligne-Mumford. We construct a purely-dimensional algebraic stack over(in the sense of Artin), the intrinsic normal cone. The notion of (perfect) obstruction theory foris introduced, and it is shown how to construct, given a perfect obstruction theory for, a pure-dimensionalvirtual fundamental classin the Chow group of. We then prove some properties of such classes, both in the absolute and in the relative context. Via a deformation theory interpretation of obstruction theories we prove that several kinds of moduli spaces carry a natural obstruction theory, and sometimes a perfect one.