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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