On the $L^2$-$\overline{\partial}$-cohomology of certain complete K\"ahler metrics

TL;DR

This paper establishes an isomorphism between $L^2$-$\overline{\partial}$-cohomology on the regular part of certain complete K"ahler spaces and the classical $\overline{\partial}$-cohomology on their resolutions, with applications to specific metric types.

Contribution

It proves a new isomorphism between $L^2$-$\overline{\partial}$-cohomology and classical cohomology for certain complete K"ahler spaces, extending previous results to Saper-type and negatively curved metrics.

Findings

Isomorphism holds under suitable metric assumptions.

Applicable to Saper-type K"ahler metrics.

Valid for complete K"ahler metrics with finite volume and pinched negative curvature.

Abstract

Let $V$ be a compact and irreducible complex space of complex dimension $v$ whose regular part is endowed with a complete Hermitian metric $h$. Let $\pi:M\rightarrow V$ be a resolution of $V$. Under suitable assumptions on $h$ we prove that $$H^{v,q}_{2,\overline{\partial}}(\operatorname{reg}(V),g)\cong H^{v,q}_{\overline{\partial}}(M),\ q=0,...,v.$$ Then we show that the previous isomorphism applies to the case of Saper-type K\"ahler metrics and to the case of complete K\"ahler metrics with finite volume and pinched negative sectional curvatures.