English

Representability of Chow groups of codimension three cycles

Algebraic Geometry 2021-03-11 v3 K-Theory and Homology

Abstract

In this note we are going to prove that if we have a fibration of smooth projective varieties XSX\to S over a surface SS such that XX is of dimension four and that the geometric generic fiber has finite dimensional motive and the first \'etale cohomology of the geometric generic fiber with respect to Ql\mathbb {Q}_l coefficients is zero and the second \'etale cohomology is spanned by divisors, then A3(X)A^3(X) (codimension three algebraically trivial cycles modulo rational equivalence) is dominated by finitely many copies of A0(S)A_0(S). Meaning that there exists finitely many correspondences Γi\Gamma_i on S×XS\times X, such that iΓi\sum_i \Gamma_i is surjective from A2(S)\oplus A^2(S) to A3(X)A^3(X).

Keywords

Cite

@article{arxiv.1906.08232,
  title  = {Representability of Chow groups of codimension three cycles},
  author = {Kalyan Banerjee},
  journal= {arXiv preprint arXiv:1906.08232},
  year   = {2021}
}

Comments

14 pages, comments are welcome, accepted for publication in Advances in Geometry