English

An algorithm for the classification of twisted forms of toric varieties

Algebraic Geometry 2018-04-27 v2 Rings and Algebras

Abstract

Let K/kK/k be a finite Galois extension, G=Gal(K/k)G=\text{Gal}(K/k), Σ\Sigma be a fan in a lattice NN and XΣX_{\Sigma} be an associated toric variety over kk. It is well known that the set of K/kK/k-forms of XΣX_{\Sigma} is in bijection with H1(G,AutΣT)H^1(G,\text{Aut}_{\Sigma}^T), where AutΣT\text{Aut}_{\Sigma}^T is an algebraic group of toric automorphisms of XΣX_{\Sigma}. In this paper, we suggest an algorithm to compute H1(G,AutΣT)H^1(G,\text{Aut}_{\Sigma}^T) and find that followings can be classified via this algorithm : K/kK/k-forms of all toric surfaces, K/kK/k-forms of all 3-dimensional affine toric varieties with no torus factor, K/kK/k-forms of all 3-dimensional quasi-projective toric varieties when K/kK/k is cyclic.

Keywords

Cite

@article{arxiv.1804.06052,
  title  = {An algorithm for the classification of twisted forms of toric varieties},
  author = {Seungkyun Park},
  journal= {arXiv preprint arXiv:1804.06052},
  year   = {2018}
}

Comments

28 pages

R2 v1 2026-06-23T01:25:54.520Z