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Irregular Hodge filtration of some confluent hypergeometric systems

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arxiv 1707.03259 v5 pith:YTGWHED7 submitted 2017-07-11 math.AG

Irregular Hodge filtration of some confluent hypergeometric systems

classification math.AG
keywords irregularsystemshodgehypergeometricfiltrationcomparisonconfluentdetermine
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abstract

We determine the irregular Hodge filtration, as introduced by Sabbah, for the purely irregular hypergeometric $\mathcal{D}$-modules. We obtain in particular a formula for the irregular Hodge numbers of these systems. We use the reduction of hypergeometric systems from GKZ-systems as well as comparison results to Gauss-Manin systems of Laurent polynomials via Fourier-Laplace and Radon transformations.

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