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On the existence of a symplectic desingularization of some moduli spaces of sheaves on a K3 surface

Published online by Cambridge University Press:  21 June 2005

Young-Hoon Kiem
Affiliation:
Department of Mathematics, Seoul National University, Seoul 151-747, Koreakiem@math.snu.ac.kr
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Abstract

Let Mc be the moduli space of semistable torsion-free sheaves of rank 2 with Chern classes c1 = 0 and c2 = c over a K3 surface with generic polarization. When $c=2n\ge 4$ is even, Mc is a singular projective variety which admits a symplectic form, called the Mukai form, on the smooth part. A natural question raised by O'Grady asks if there exists a desingularization on which the Mukai form extends everywhere nondegenerately. In this paper we show that such a desingularization does not exist for many even integers c by computing the stringy Euler numbers.

Type
Research Article
Copyright
Foundation Compositio Mathematica 2005

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