Stable maps and Quot schemes

Details Stable maps and Quot schemes Stable maps and Quot schemes

2000-12-21

arxiv.org/abs/math/0012221v2

Invent. Math. 152 (2003), no.3, 625-663

Mathematics

Algebraic Geometry

39 pages, 1 figure; final version with a few expository changes suggested by the referee

Scientific paper

In this paper we study the relationship between two different compactifications of the space of vector bundle quotients of an arbitrary vector bundle on a curve. One is Grothendieck's Quot scheme, while the other is a moduli space of stable maps to the relative Grassmannian. We establish an essentially optimal upper bound on the dimension of the two compactifications. Based on that, we prove that for an arbitrary vector bundle, the Quot schemes of quotients of large degree are irreducible and generically smooth. We precisely describe all the vector bundles for which the same thing holds in the case of the moduli spaces of stable maps. We show that there are in general no natural morphisms between the two compactifications. Finally, as an application, we obtain new cases of a conjecture on effective base point freeness for pluritheta linear series on moduli spaces of vector bundles.

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