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$L^2$ extension of holomorphic functions for log canonical pairs

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arxiv 2108.11934 v3 pith:6PKUHBZ5 submitted 2021-08-26 math.CV math.AG

classification math.CVmath.AG
keywords measurecanonicalohsawaanalyticcriteriondemaillyextensionholomorphic
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abstract

In a general $L^2$ extension theorem of Demailly for log canonical pairs, the $L^2$ criterion with respect to a measure called the Ohsawa measure determines when a given holomorphic function can be extended. Despite the analytic nature of the Ohsawa measure, we establish a geometric characterization of this analytic criterion using the theory of log canonical centers from algebraic geometry. Along the way, we characterize when the Ohsawa measure fails to have generically smooth positive density, which answers an essential question arising from Demailly's work.

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  1. An extension theorem in terms of adjoint ideal sheaves

    math.CV 2026-07 conditional novelty 5.0 of 10

    On compact Kähler manifolds, holomorphic top forms on σ-lc centres of the same codimension extend to the ambient space, without L² estimates, under the curvature positivity condition (eq5.1).

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