arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1004.1844math.AGmath.AT
收藏

奇异复形algebraic varieties的等变特征类

Equivariant characteristic classes of singular complex algebraic varieties

Sylvain E. Cappell, Laurentiu Maxim, Joerg Schuermann, Julius L. Shaneson

摘要:

奇异簇的同调Hirzebruch特征类最近已经由Schuelet-Schuermann-Yokura定义,作为统一先前已知的奇异空间的示性类理论的尝试(例如,MacPherson-Chern类、Baum-Fulton-MacPherson Todd类和Goresky-MacPherson L类)。在本文中,我们定义了这些类的等变类似物,用于由代数自同构的有限群作用的奇异拟射影簇,并展示了如何使用这些类来计算全局商簇的同调Hirzebruch类。我们还在单值问题的上下文中计算新的类,例如,对于在连通代数流形上等变地(在复拓扑中)纤维的簇。作为另一个应用,我们讨论了整体orbifolds的扭Hirzebruch类的Atiyah-Meyer型公式.

英文摘要:

Homology Hirzebruch characteristic classes for singular varieties have been recently defined by Brasselet-Schuermann-Yokura as an attempt to unify previously known characteristic class theories for singular spaces (e.g., MacPherson-Chern classes, Baum-Fulton-MacPherson Todd classes, and Goresky-MacPherson L-classes, respectively). In this note we define equivariant analogues of these classes for singular quasi-projective varieties acted upon by a finite group of algebraic automorphisms, and show how these can be used to calculate the homology Hirzebruch classes of global quotient varieties. We also compute the new classes in the context of monodromy problems, e.g., for varieties that fiber equivariantly (in the complex topology) over a connected algebraic manifold. As another application, we discuss Atiyah-Meyer type formulae for twisted Hirzebruch classes of global orbifolds.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑