English

Breuil-Kisin Modules via crystalline cohomology

Number Theory 2019-03-26 v3 Algebraic Geometry

Abstract

For a perfect field kk of characteristic p>0p>0 and a smooth and proper formal scheme X\mathscr{X} over the ring of integers of a finite and totally ramified extension KK of W(k)[1/p]W(k)[1/p], we propose a cohomological construction of the Breuil-Kisin modules attached to the pp-adic \'etale cohomology Heˊti(XK,Zp)H^i_{\mathrm{\'et}}(\mathscr{X}_{\overline{K}},\mathbf{Z}_p). We then prove that our proposal works when p>2p>2, i<p1i < p-1, and the crystalline cohomology of the special fiber of X\mathscr{X} is torsion-free in degrees ii and i+1i+1.

Keywords

Cite

@article{arxiv.1610.09706,
  title  = {Breuil-Kisin Modules via crystalline cohomology},
  author = {Bryden Cais and Tong Liu},
  journal= {arXiv preprint arXiv:1610.09706},
  year   = {2019}
}