Year: 2025
Type: preprint
Abstract: We prove a functoriality formula for Baum--Bott residues under holomorphic pull-back. Let $f:V\to X$ be a holomorphic map generically transverse to a singular holomorphic foliation $\mathscr F$ on $X$. Under a compatibility condition on the tangent and normal sheaves, the localized Baum--Bott class of $f^*\mathscr F$ is the pull-back of that of $\mathscr F$, and the corresponding residue is obtained by localized intersection. We also discuss the universal relative class of Baum and Bott and its relation with the rationality conjecture. If the characteristic polynomial has rational coefficients, rational residues remain rational under the pull-backs considered here. For proper surjective generically finite maps of equal dimension, we obtain in addition a push-forward formula; hence rationality is equivalent before and after pull-back, in particular for bimeromorphic modifications satisfying the hypotheses of the theorem.
Source: arXiv (Cornell University)
Authors: Corrêa, Maurício, Suwa, Tatsuo
Language: English
Subfield: Geometry and Topology
Field: Mathematics
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W4406880116