Residue functions and Extension problems

TL;DR

This paper explores the use of residue functions to obtain $L^2$ estimates in holomorphic extension problems, connecting singularity measures with extension theorems and confirming a measure equivalence in a key case.

Contribution

It introduces the application of residue functions to derive $L^2$ estimates in extension theorems and establishes their equivalence with the Ohsawa measure in specific cases.

Findings

Residue functions can be used to retrieve $L^2$ estimates for holomorphic extensions.

The 1-lc-measure defined via residue functions equals the Ohsawa measure in the Ohsawa--Takegoshi theorem.

Abstract

The "qualitative" extension theorem of Demailly guarantees existence of holomorphic extensions of holomorphic sections on some subvariety under certain positive-curvature assumption, but that comes without any estimate of the extensions, especially when the singular locus of the subvariety is non-empty and the holomorphic section to be extended does not vanish identically there. Residue functions are analytic functions which connect the $L^2$ norms on the subvarieties (or their singular loci) to $L^2$ norms with specific weights on the ambient space. Motivated by the conjectural "dlt extension", this note discusses the possibility of retrieving the $L^2$ estimates for the extensions in the general situation via the use of the residue functions. It is also shown in this note that the $1$-lc-measure defined via the residue function of index $1$ is indeed equal to the Ohsawa measure in the Ohsawa--Takegoshi $L^2$ extension theorem.