English

Relative crystalline representations and $p$-divisible groups in the small ramification case

Number Theory 2020-11-25 v4

Abstract

Let kk be a perfect field of characteristic p>2p > 2, and let KK be a finite totally ramified extension over W(k)[1p]W(k)[\frac{1}{p}] of ramification degree ee. Let R0R_0 be a relative base ring over W(k)t1±1,,tm±1W(k)\langle t_1^{\pm 1}, \ldots, t_m^{\pm 1}\rangle satisfying some mild conditions, and let R=R0W(k)OKR = R_0\otimes_{W(k)}\mathcal{O}_K. We show that if e<p1e < p-1, then every crystalline representation of π1eˊt(SpecR[1p])\pi_1^{\text{\'et}}(\mathrm{Spec}R[\frac{1}{p}]) with Hodge-Tate weights in [0,1][0, 1] arises from a pp-divisible group over RR.

Keywords

Cite

@article{arxiv.1902.06546,
  title  = {Relative crystalline representations and $p$-divisible groups in the small ramification case},
  author = {Tong Liu and Yong Suk Moon},
  journal= {arXiv preprint arXiv:1902.06546},
  year   = {2020}
}

Comments

19 pages; changed the title; added section 6 and more details

R2 v1 2026-06-23T07:43:39.771Z