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Perversity equals weight for Painlev\'e spaces

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arxiv 1802.03798 v5 pith:5BAAECBQ submitted 2018-02-11 math.AG

classification math.AG
keywords conjecturepainlevcasesspacescohomologyfiltrationgeometricweight
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abstract

We provide further evidence to the $P=W$ conjecture of de Cataldo, Hausel and Migliorini, by checking it in the Painlev\'e cases. Namely, we compare the perverse Leray filtration induced by the Hitchin map on the cohomology spaces of the Dolbeault moduli space and the weight filtration on the cohomology spaces of the irregular character variety corresponding to each of the Painlev\'e $I-VI$ systems. We find that the two filtrations agree. Along the way, we prove the Geometric $P=W$ conjecture of Katzarkov, Noll, Pandit and Simpson in the Painlev\'e cases, and show that in these cases the Geometric $P=W$ conjecture implies the $P=W$ conjecture.

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  1. 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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