English

Baum-Bott residue currents

Complex Variables 2024-03-12 v2 Algebraic Geometry Differential Geometry

Abstract

Let F\mathscr{F} be a holomorphic foliation of rank κ\kappa on a complex manifold MM of dimension nn, let ZZ be a compact connected component of the singular set of F\mathscr{F}, and let ΦC[z1,,zn]\Phi \in \mathbb C[z_1,\ldots,z_n] be a homogeneous symmetric polynomial of degree \ell with nκ<nn-\kappa < \ell \leq n. Given a locally free resolution of the normal sheaf of F\mathscr{F}, equipped with Hermitian metrics and certain smooth connections, we construct an explicit current RZΦR^\Phi_Z with support on ZZ that represents the Baum-Bott residue resΦ(F;Z)H2n2(Z,C)\text{res}^\Phi(\mathscr{F}; Z)\in H_{2n-2\ell}(Z, \mathbb C) and is obtained as the limit of certain smooth representatives of resΦ(F;Z)\text{res}^\Phi(\mathscr{F}; Z). If the connections are (1,0)(1,0)-connections and codimZ\text{codim} Z\geq \ell, then RZΦR^\Phi_Z is independent of the choice of metrics and connections. When F\mathscr{F} has rank one we give a more precise description of RZΦR^\Phi_Z in terms of so-called residue currents of Bochner-Martinelli type. In particular, when the singularities are isolated, we recover the classical expression of Baum-Bott residues in terms of Grothendieck residues.

Cite

@article{arxiv.2302.08887,
  title  = {Baum-Bott residue currents},
  author = {Lucas Kaufmann and Richard Lärkäng and Elizabeth Wulcan},
  journal= {arXiv preprint arXiv:2302.08887},
  year   = {2024}
}
R2 v1 2026-06-28T08:42:46.472Z