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Topology of Lagrangian fibrations and Hodge theory of hyper-K\"ahler manifolds

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arxiv 1812.10673 v5 pith:U4LXRMHZ submitted 2018-12-27 math.AG math.DG

classification math.AGmath.DG
keywords lagrangianfibrationhodgetopologyahlerassociatedfibrationshyper-k
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We establish a compact analog of the P = W conjecture. For a holomorphic symplectic variety with a Lagrangian fibration, we show that the perverse numbers associated with the fibration match perfectly with the Hodge numbers of the total space. This builds a new connection between the topology of Lagrangian fibrations and the Hodge theory of hyper-K\"ahler manifolds. We present two applications of our result, one on the topology of the base and fibers of a Lagrangian fibration, the other on the refined Gopakumar-Vafa invariants of a K3 surface. Furthermore, we show that the perverse filtration associated with a Lagrangian fibration is multiplicative under cup product.

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Cited by 2 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. P=W for Lagrangian fibrations and degenerations of hyper-K\"ahler manifolds

    math.AG 2019-08 accept novelty 7.0 of 10

    For every Lagrangian fibration of a projective hyper-Kähler manifold, the perverse filtration equals the monodromy weight filtration of an associated type III degeneration.

  2. Torus fibers and the weight filtration

    math.AG 2019-08 conditional novelty 7.0 of 10

    A single real torus inside a log Calabi-Yau complement (or a Calabi-Yau degeneration) computes the odd weight filtration, yielding P=W type results for rational surfaces and K3 surfaces.

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