Journal of Differential Geometry

Moduli of Sheaves on Surfaces and Action of the Oscillator Algebra

Abstract

This paper gives a generalization of some results on Hilbert schemes of points on surfaces. Let MG(r,n) (resp. MU(r,n)) be the Gieseker (resp. Uhlenbeck) compactification of the moduli spaces of stable bundles on a smooth projective surface. We show that, for surfaces satisfying some technical condition:

(a) The natural map MG(r,n) → MU(r,n) generalizing the Hilbert-Chow morphism from the Hilbert scheme of n points on S to the n-th symmetric power, is strictly semi-small in the sense of Goresky-MacPherson with respect to some stratification.

(b) Let Pt(X) be the Intersection Homology Poincare polynomial of X. Generalizing the computation due to Gottsche and Sorgel we prove that the ratio ∑n qnPt(MG(r,n))/∑n qnPt(MU(r,n)) is a character of a certain Heisenberg-type algebra.

(c) Generalizing results of Nakajima we show how to obtain the action of the Heisenberg algebra on the cohomology using correspondences.

Article information

Source
J. Differential Geom., Volume 55, Number 2 (2000), 193-227.

Dates
First available in Project Euclid: 20 July 2004

Permanent link to this document
https://projecteuclid.org/euclid.jdg/1090340878

Digital Object Identifier
doi:10.4310/jdg/1090340878

Mathematical Reviews number (MathSciNet)
MR1847311

Zentralblatt MATH identifier
1033.14028

Citation

Baranovsky, Vladimir. Moduli of Sheaves on Surfaces and Action of the Oscillator Algebra. J. Differential Geom. 55 (2000), no. 2, 193--227. doi:10.4310/jdg/1090340878. https://projecteuclid.org/euclid.jdg/1090340878