A new six dimensional irreducible symplectic variety

Details A new six dimensional irreducible symplectic variety A new six dimensional irreducible symplectic variety

2000-10-19

arxiv.org/abs/math/0010187v1

Mathematics

Algebraic Geometry

68 pages

Scientific paper

By results of the author there exists a projective (holomorphic) symplectic desingularization of the moduli space of rank-two torsion-free sheaves on a genus-two Jacobian with $c_1=0$ and $c_2=2$. This desingularization has a natural map to the self-product of the Jacobian. We show that the fiber over $(0,0)$ is a 6-dimensional projective irreducible symplectic variety (and hence a 12-dimensional compact Hyperkahler manifold) with second Betti number equal to 8. Thus it is not deformation equivalent to any of the (few) known examples of irreducible symplectic varieties, even up to birational equivalence.

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