Abstract
Let X be a compact Kähler holomorphic-symplectic manifold, which is deformation equivalent to the Hilbert scheme of length n subschemes of a K3 surface. Let \(\mathcal{L}\) be a nef line-bundle on X, such that the top power \(c_{1}(\mathcal{L})^{2n}\) vanishes and \(c_{1}(\mathcal{L})\) is primitive. Assume that the two dimensional subspace H 2, 0(X) ⊕ H 0, 2(X) of \(H^{2}(X, \mathbb{C})\) intersects \(H^{2}(X, \mathbb{Z})\) trivially. We prove that the linear system of \(\mathcal{L}\) is base point free and it induces a Lagrangian fibration on X. In particular, the line-bundle \(\mathcal{L}\) is effective. A determination of the semi-group of effective divisor classes on X follows, when X is projective. For a generic such pair \((X,\mathcal{L})\), not necessarily projective, we show that X is bimeromorphic to a Tate-Shafarevich twist of a moduli space of stable torsion sheaves, each with pure one dimensional support, on a projective K3 surface.
Partially supported by Simons Foundation Collaboration Grant 245840 and by NSA grant H98230-13-1-0239.
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Notes
- 1.
Prop. 5.6 and Lemma 6.22 in the last reference [23]. The same convention will be used throughout the paper for all citations with multiple references.
- 2.
The saturation of a sublattice L ′ of Λ is the maximal sublattice L of Λ, of the same rank as L ′, which contains L ′.
- 3.
I thank K. Oguiso and S. Rollenske for pointing out to me that in the non-algebraic case the result should follow from the above via the results of Ref. [8].
- 4.
I thank C. Lehn for Ref. [18, Prop. 2.4], used in an earlier argument, and T. Peternell and Y. Kawamata for suggesting the current more direct argument.
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Acknowledgements
I would like thank Yujiro Kawamata, Christian Lehn, Daisuke Matsushita, Keiji Oguiso, Osamu Fujino, Thomas Peternell, Sönke Rollenske, Justin Sawon, and Kota Yoshioka for helpful communications. I would like to thank the two referees for their careful reading and insightful comments and suggestions.
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Dedicated to Klaus Hulek on the occasion of his sixtieth birthday.
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Markman, E. (2014). Lagrangian Fibrations of Holomorphic-Symplectic Varieties of K3[n]-Type. In: Frühbis-Krüger, A., Kloosterman, R., Schütt, M. (eds) Algebraic and Complex Geometry. Springer Proceedings in Mathematics & Statistics, vol 71. Springer, Cham. https://doi.org/10.1007/978-3-319-05404-9_10
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