English

Logarithmic good reduction of abelian varieties

Algebraic Geometry 2016-10-25 v2 Number Theory

Abstract

Let KK be a field which is complete for a discrete valuation. We prove a logarithmic version of the N\'eron-Ogg-Shafarevich criterion: if AA is an abelian variety over KK which is cohomologically tame, then AA has good reduction in the logarithmic setting, i.e. there exists a projective, log smooth model of AA over OK\mathcal{O}_K. This implies in particular the existence of a projective, regular model of AA, generalizing a result of K\"unnemann. The proof combines a deep theorem of Gabber with the theory of degenerations of abelian varieties developed by Mumford, Faltings-Chai et al.

Keywords

Cite

@article{arxiv.1512.02464,
  title  = {Logarithmic good reduction of abelian varieties},
  author = {Alberto Bellardini and Arne Smeets},
  journal= {arXiv preprint arXiv:1512.02464},
  year   = {2016}
}

Comments

final version, to appear in Mathematische Annalen

R2 v1 2026-06-22T12:04:12.922Z