English

A Hodge-Tate decomposition with rigid analytic coefficients

Algebraic Geometry 2026-01-13 v2

Abstract

Let XX be a smooth proper rigid analytic space over a complete algebraically closed field extension KK of Qp\mathbb{Q}_p. We establish a Hodge--Tate decomposition for XX with GG-coefficients, where GG is any commutative locally pp-divisible rigid group. This generalizes the Hodge--Tate decomposition of Faltings and Scholze, which is the case G=GaG=\mathbb{G}_a. For this, we introduce geometric analogs of the Hodge--Tate spectral sequence with general locally pp-divisible coefficients. We prove that these spectral sequences degenerate at E2E_2. Our results apply more generally to a class of smooth families of commutative adic groups over XX and in the relative setting of smooth proper morphisms XSX\rightarrow S of smooth rigid spaces. We deduce applications to analytic Brauer groups and the geometric pp-adic Simpson correspondence.

Keywords

Cite

@article{arxiv.2411.07366,
  title  = {A Hodge-Tate decomposition with rigid analytic coefficients},
  author = {Lucas Gerth},
  journal= {arXiv preprint arXiv:2411.07366},
  year   = {2026}
}

Comments

v2: accepted version, added a subsection on rigid approximation (3.2) and improved the main result (Thm. 1.6), 40 pages, the numbering changed throughout

R2 v1 2026-06-28T19:56:07.565Z