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Extending holomorphic forms from the regular locus of a complex space to a resolution of singularities

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(2018)cite arxiv:1811.03644Comment: Any comments or questions are welcome!.

Abstract

We investigate under what conditions holomorphic forms defined on the regular locus of a complex space will extend to a resolution of singularities. Our main result, proved using Hodge modules and the Decomposition Theorem, is that on any reduced complex space of constant dimension $n$, the extension problem for all holomorphic forms is controlled by what happens for holomorphic $n$-forms. This implies the existence of a functorial pull-back for reflexive differentials on spaces with rational singularities. We also prove a variant of the main result for forms with logarithmic poles, and use our methods to settle the "local vanishing conjecture" proposed by Mustata, Olano, and Popa.

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