Vanishing and injectivity for R-Hodge modules and R-divisors

TL;DR

This paper extends classical vanishing and injectivity theorems to R-Hodge modules and R-divisors on projective varieties, broadening their applicability and deriving a Fujita-type freeness result.

Contribution

It generalizes key theorems for rational Hodge modules and integral divisors to the R-setting, including injectivity, vanishing, and freeness results.

Findings

Generalized injectivity theorem for R-Hodge modules.

Extended vanishing theorem for R-divisors.

Established a Fujita-type freeness result for R-Hodge modules.

Abstract

We prove the injectivity and vanishing theorem for R-Hodge modules and R-divisors over projective varieties, extending the results for rational Hodge modules and integral divisors in \cite{Wu15}. In particular, the injectivity generalizes the fundamental injectivity of Esnault-Viehweg for normal crossing Q-divisors, while the vanishing generalizes Kawamata-Viehweg vanishing for Q-divisors. As a main application, we also deduce a Fujita-type freeness result for R-Hodge modules in the normal crossing case.