Mathematics – Algebraic Geometry
Scientific paper
2004-05-29
Mathematics
Algebraic Geometry
28 pages, LaTeX2e. Final version, to appear in MMJ
Scientific paper
We study the local structure of the singularity in the moduli space of sheaves on a K3 surface which has been resolved by K O'Grady in his construction of new examples of hyperkaehler manifolds. In particular, we identify the singularity with the closure of a certain nilpotent orbit in the coadjoint representation of the group $Sp(4)$. We also prove that the moduli spaces for some other sets of numerical parameters do not admit a smooth symplectic resolution of singularities.
Kaledin Dmitry
Lehn Manfred
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