Derived Kodaira Spencer map, Cosection lemma, and semiregularity
Algebraic Geometry
2009-03-30 v2 Commutative Algebra
Abstract
The cosection lemma proved by J. Li and Y.H. Kiem said the intrinsic normal cone lies inside the kernel of any cosection of the obstruction sheaf when the moduli has a perfect obstruction theory. With a definition of higher tangent vectors of a scheme at a point, and a construction of the derived Kodaira Spencer map by K. Behrend and B. Fantechi, we prove a derived version of cosection lemma without perfect obstruction theory condition. As an application we give a short proof of the Kodaira's Principle \textit{ambient cohomology annihilates obstruction} (semiregularity), assuming the existence of locall universal family.
Keywords
Cite
@article{arxiv.0808.0988,
title = {Derived Kodaira Spencer map, Cosection lemma, and semiregularity},
author = {Huai-Liang Chang},
journal= {arXiv preprint arXiv:0808.0988},
year = {2009}
}
Comments
10 pages