English

Segre forms of singular metrics on vector bundles and Lelong numbers

Complex Variables 2026-03-02 v2 Differential Geometry

Abstract

Let EXE\to X be a holomorphic vector bundle. We consider a class of a singular Hermitian metrics on EE with analytic singularities that contains all Griffiths negative such metrics. One can define, given a smooth reference metric h0h_0, a current s(E,h,h0)s(E,h,h_0) called the associated Segre form, which defines the expected Bott-Chern class and coincides with the usual Segre form of hh where it is smooth. We prove that s(E,h,h0)s(E,h,h_0) is the limit of the Segre forms of a sequence of smooth metrics if the metric is smooth outside the degeneracy locus, and in general as a limit of Segre forms of metrics with empty degeneracy locus. One can also define an associated Chern form c(E,h,h0)c(E,h,h_0). We prove that the Lelong numbers of s(E,h,h0)s(E,h,h_0) and c(E,h,h0)c(E,h,h_0) are integers if the singularities are integral, and non-negative for s(E,h,h0)s(E,h,h_0).

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Cite

@article{arxiv.2506.15473,
  title  = {Segre forms of singular metrics on vector bundles and Lelong numbers},
  author = {Mats Andersson and Richard Lärkäng},
  journal= {arXiv preprint arXiv:2506.15473},
  year   = {2026}
}

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29 pages