Chow cohomology and Lefschetz (1,1)-theorem
Algebraic Geometry
2025-06-17 v1
Abstract
Any smooth, projective variety satisfies the Hodge conjecture in codimension one, known as the Lefschetz (1,1) theorem. Totaro formulated a version for singular varieties. He asked whether the natural Bloch-Gillet-Soul\'{e} cycle class map from the operational Chow group to the (1,1)-classes in the weight graded piece of the cohomology group is surjective? In this short article, we give a sufficient criterion for this to hold. In particular, we show that several singular varieties with at worst isolated singularities (log canonical, divisorial log terminal, ADE-singularities) satisfy the singular Hodge conjecture in codimension 1.
Keywords
Cite
@article{arxiv.2506.13220,
title = {Chow cohomology and Lefschetz (1,1)-theorem},
author = {Ananyo Dan and Inder Kaur},
journal= {arXiv preprint arXiv:2506.13220},
year = {2025}
}
Comments
11 pages