English

A prismatic-etale comparison theorem in the semistable case

Algebraic Geometry 2025-07-14 v1 Number Theory

Abstract

Let KQpK|\mathbb{Q}_p be a complete discrete valuation field with perfect residue field, OKO_K be its ring of integers. Consider a semistable pp-adic formal scheme XX over Spf(OK)\mathrm{Spf}(O_K) with smooth generic fiber XηX_{\eta}. Du--Liu--Moon--Shimizu showed recently that the category of analytic prismatic FF-crystals on the absolute log prismatic site of XX is equivalent to the category of semistable \'etale Zp\mathbb{Z}_p-local systems on the adic generic fiber XηX_{\eta}. In this article, we prove a comparison between the Breuil--Kisin cohomology of an analytic log prismatic FF-crystal on XX and the \'etale cohomology of its corresponding \'etale Zp\mathbb{Z}_p-local system. This generalizes Guo--Reneicke's prismatic--\'etale comparison for crystalline Zp\mathbb{Z}_p-local systems to the semi-stable case

Keywords

Cite

@article{arxiv.2507.08451,
  title  = {A prismatic-etale comparison theorem in the semistable case},
  author = {Yichao Tian},
  journal= {arXiv preprint arXiv:2507.08451},
  year   = {2025}
}

Comments

61 pages

R2 v1 2026-07-01T03:56:17.449Z