Hirzebruch class and Bialynicki-Birula decomposition

Abstract

Suppose an algebraic torus acts on a complex algebraic variety $X$. Then a great part of information about global invariants of $X$ are encoded in some data localized around the fixed points. The goal of this note is to present a connection between two approaches to localization for $C^{\ast }$-action. The homological results are related to $S^1$-action, while from $R_{>0}^{\ast }$-action we obtain a geometric decomposition. We study the resulting decompositions of Hirzebruch ${\chi }_y$-genus and their relative versions. We show that via a limit process the second decomposition is obtained from the first one. The results are also valid for singular varieties.

16 pages

References in corpus (1)

• Applications of Equivariant Cohomology

Cited by in corpus (1)

• Equivariant Hirzebruch class for singular varieties