English

Universal Weil cohomology

Algebraic Geometry 2025-02-04 v3 Category Theory K-Theory and Homology Number Theory

Abstract

We construct a new Weil cohomology for smooth projective varieties over a field, universal among Weil cohomologies with values in rigid additive tensor categories. A similar universal problem for Weil cohomologies with values in rigid abelian tensor categories also has a solution. We give a variant for Weil cohomologies satisfying more axioms, like Weak and Hard Lefschetz. As a consequence, we get a different construction of Andr\'e's category of motives for motivated correspondences and show that it has a universal property. This theory extends over suitable bases.

Keywords

Cite

@article{arxiv.2401.14127,
  title  = {Universal Weil cohomology},
  author = {L. Barbieri-Viale and B. Kahn},
  journal= {arXiv preprint arXiv:2401.14127},
  year   = {2025}
}

Comments

Exposition improved

R2 v1 2026-06-28T14:27:00.785Z