Components of the Hilbert scheme of space curves on low-degree smooth surfaces

Details Components of the Hilbert scheme of space curves on low-degree smooth surfaces Components of the Hilbert scheme of space curves on low-degree smooth surfaces

2012-04-21

arxiv.org/abs/1204.4819v1

Mathematics

Algebraic Geometry

18 pages

Scientific paper

We study maximal families W of the Hilbert scheme, H(d,g)_{sc}, of smooth connected space curves whose general curve C lies on a smooth surface S of degree s. For every integer s we give conditions on C under which W is a generically smooth component of H(d,g)_{sc} and we determine dim W. If s=4 and W is an irreducible component of H(d,g)_{sc}, then the Picard number of S is at most 2 and we explicitly describe non-reduced and generically smooth components in the case Pic(S) is generated by the classes of a line and a smooth plane cubic curve. For curves on smooth cubic surfaces we find new classes of non-reduced components of H(d,g)_{sc}, thus making progress in proving a conjecture for such families.

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