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
中科院分区:
文献类型:
--
作者:
K. Behrend;B. Fantechi
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.