On the discriminant locus of a Lagrangian fibration
On the discriminant locus of a Lagrangian fibration
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关于拉格朗日纤维的判别轨迹
DOI:
10.1007/s00208-007-0189-9
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发表时间:
2006
影响因子:
1.4
通讯作者:
Justin Sawon
中科院分区:
文献类型:
--
作者:
Justin Sawon
Let $$X \rightarrow {\mathbb{P}}^n$$ be an irreducible holomorphic symplectic manifold of dimension 2n fibred over $${\mathbb{P}}^n$$ . Matsushita proved that the generic fibre is a holomorphic Lagrangian abelian variety. In this article we study the discriminant locus $$\Delta\subset{\mathbb{P}}^n$$ parametrizing singular fibres. Our main result is a formula for the degree of Δ, leading to bounds on the degree when X is a fourfold.