Abel maps and limit linear series

Details Abel maps and limit linear series Abel maps and limit linear series

2011-02-15

arxiv.org/abs/1102.3191v1

Mathematics

Algebraic Geometry

15 pages

Scientific paper

We explore the relationship between limit linear series and fibers of Abel maps in the case of curves with two smooth components glued at a single node. To an r-dimensional limit linear series satisfying a certain exactness property (weaker than the refinedness property of Eisenbud and Harris) we associate a closed subscheme of the appropriate fiber of the Abel map. We then describe this closed subscheme explicitly, computing its Hilbert polynomial and showing that it is Cohen-Macaulay of pure dimension r. We show that this construction is also compatible with one-parameter smoothings.

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