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On the homology of the Hilbert scheme of points in the plane. (English) Zbl 0625.14002
The authors calculate the Betti numbers of the Hilbert scheme of points in the plane. Observe that the maximal torus of SL(3) acts on $$Hilb^ d({\mathbb{P}}^ 2)$$ with isolated fixed points. It follows from a result of Birula-Białynicki that $$Hilb^ d({\mathbb{P}}^ 2)$$ has a cellular decomposition. Then the calculation of the Betti numbers reduces to a careful study of the representation of the torus at the tangent spaces of the fixed points. As a by-product to their method, the authors also obtain similar results about the punctual Hilbert scheme and the Hilbert scheme of points in the affine plane.
Reviewer: L.Ein

MSC:
 14C05 Parametrization (Chow and Hilbert schemes) 14N05 Projective techniques in algebraic geometry
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References:
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