English

Vector bundles over certain Koras-Russell threefolds of the third kind

Algebraic Geometry 2026-03-12 v1 K-Theory and Homology

Abstract

Let kk be an algebraically closed base field of characteristic 00 and let α1,α2,α3,d2\alpha_{1}, \alpha_{2}, \alpha_{3}, d \geq 2 be integers such that α1,α2,α3\alpha_{1}, \alpha_{2}, \alpha_{3} are pairwise coprime and gcd(α1,d1)=1gcd (\alpha_{1},d-1) = 1. Then consider the Koras-Russell threefold Y:={x+xdyα1+zα2+tα3=0}Ak4Y := \{ x + x^d y^{\alpha_{1}} + z^{\alpha_{2}} + t^{\alpha_{3}} = 0\} \subset \mathbb{A}^{4}_{k}. We prove that the Chow groups CHi(Y)CH^{i}(Y) are trivial for i=1,2,3i=1,2,3 and therefore all algebraic vector bundles over YY are trivial. If α1\alpha_{1} is odd, we also prove that the Chow-Witt groups CH~i(Y,L)\widetilde{CH}^{i}(Y, \mathcal{L}) are trivial for i=1,2,3i=1,2,3 and any line bundle L\mathcal{L} over YY.

Keywords

Cite

@article{arxiv.2603.10181,
  title  = {Vector bundles over certain Koras-Russell threefolds of the third kind},
  author = {Tariq Syed},
  journal= {arXiv preprint arXiv:2603.10181},
  year   = {2026}
}

Comments

10 pages; comments welcome!