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arXiv math/9910083math.ATmath.AG
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环面作用流形的Hirzebruch类

Hirzebruch genera of manifolds with torus action

Taras E. Panov

摘要:

拟流形是一个光滑的2n-流形M^{2n},它具有紧致环面T^n的作用,使得该作用与T^n在C^n上的标准作用局部同构,并且轨道空间作为带角流形与简单多胞形P^n同构。这个名字指的是拟复曲面流形的拓扑和组合性质类似于非奇异代数复曲面簇(或复曲面流形)。与环面簇不同,拟流形可能不是复的;然而,它们总是允许一个稳定(或弱几乎)的复结构,它们的配边类生成复配边环。正如Buchstaber和Ray最近所证明的,拟素流形上的稳定复结构是用纯组合术语定义的,即由多面体的定向和从多面体的余维1面集到整数格的本原向量的函数定义的。利用相应的组合数据计算了具有稳定复结构的拟流形的χ_y-亏格。特别是,这给出了明确的公式为经典托德属和签名。我们还与我们的结果与著名的事实在理论的复曲面品种。

英文摘要:

A quasitoric manifold is a smooth 2n-manifold M^{2n} with an action of the compact torus T^n such that the action is locally isomorphic to the standard action of T^n on C^n and the orbit space is diffeomorphic, as manifold with corners, to a simple polytope P^n. The name refers to the fact that topological and combinatorial properties of quasitoric manifolds are similar to that of non-singular algebraic toric varieties (or toric manifolds). Unlike toric varieties, quasitoric manifolds may fail to be complex; however, they always admit a stably (or weakly almost) complex structure, and their cobordism classes generate the complex cobordism ring. As it have been recently shown by Buchstaber and Ray, a stably complex structure on a quasitoric manifold is defined in purely combinatorial terms, namely, by an orientation of the polytope and a function from the set of codimension-one faces of the polytope to primitive vectors of an integer lattice. We calculate the χ_y-genus of a quasitoric manifold with fixed stably complex structure in terms of the corresponding combinatorial data. In particular, this gives explicit formulae for the classical Todd genus and signature. We also relate our results with well-known facts in the theory of toric varieties.

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