Desingularized moduli spaces of sheaves on a K3, II

Details Desingularized moduli spaces of sheaves on a K3, II Desingularized moduli spaces of sheaves on a K3, II

1998-05-22

arxiv.org/abs/math/9805099v1

Mathematics

Algebraic Geometry

plain tex, 19 pages

Scientific paper

In preprint alg-geom/9708009 we have constructed a (ten-dimensional) symplectic desingularization of the moduli space of rank-two torsion-free semistable sheaves on a $K3$, with trivial determinant and second Chern class equal to 4. In the present paper we prove that (every deformation of) this desingularization is a new irreducible symplectic variety. More precisely we show that the desingularization is irreducible symplectic, and that its second Betti number is at least 24.

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