Tautological module and intersection theory on Hilbert schemes of nodal curves

Details Tautological module and intersection theory on Hilbert schemes of nodal curves Tautological module and intersection theory on Hilbert schemes of nodal curves

2009-05-14

arxiv.org/abs/0905.2229v5

Mathematics

Algebraic Geometry

Scientific paper

We study intersection theory on the relative Hilbert scheme of a family of nodal-or-smooth curves, over a base of arbitrary dimension. We introduce an additive group called 'discriminant module', generated by diagonal loci, node scrolls, and twists thereof, and determine the action of the discriminant or big diagonal divisor on this group by intersection. We show that this suffices to determine arbitrary polynomials in Chern classes, in particular Chern numbers, for the tautological vector bundles on the Hilbert schemes, which are closely related to enumerative geometry. The latest version includes some new explicit computations and reference to a computer program due to G. Liu implementing our intersection calculus.

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