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Hilbert schemes and stable pairs: GIT and derived category wall crossings

Jacopo Stoppa, Richard P. Thomas (2011)

Bulletin de la Société Mathématique de France

We show that the Hilbert scheme of curves and Le Potier’s moduli space of stable pairs with one dimensional support have a common GIT construction. The two spaces correspond to chambers on either side of a wall in the space of GIT linearisations. We explain why this is not enough to prove the “DT/PT wall crossing conjecture” relating the invariants derived from these moduli spaces when the underlying variety is a 3-fold. We then give a gentle introduction to a small part of Joyce’s theory for such...

Hodge numbers of a double octic with non-isolated singularities

Sławomir Cynk (2000)

Annales Polonici Mathematici

If B is a surface in ℙ³ of degree 8 which is the union of two smooth surfaces intersecting transversally then the double covering of ℙ³ branched along B has a non-singular model which is a Calabi-Yau manifold. The aim of this note is to compute the Hodge numbers of this manifold.

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