English

Comparisons of Lie algebra cohomologies of $(\varphi,\Gamma)$-modules

Number Theory 2025-04-16 v2

Abstract

We generalise a result of Fourquaux and Xie thereby completely determining the relationship between Qp\mathbb{Q}_p and LL-analytic Lie algebra cohomology of analytic (φL,ΓL)(\varphi_L,\Gamma_L)-modules. We use the results to conclude that for LQp,L\neq \mathbb{Q}_p, there exist examples of \'etale (φL,ΓL)(\varphi_L,\Gamma_L)-modules over Robba rings whose Qp\mathbb{Q}_p-analytic cohomology does not arise as a base change of Galois cohomology.

Keywords

Cite

@article{arxiv.2311.07799,
  title  = {Comparisons of Lie algebra cohomologies of $(\varphi,\Gamma)$-modules},
  author = {Rustam Steingart},
  journal= {arXiv preprint arXiv:2311.07799},
  year   = {2025}
}

Comments

Page numbering may differ from published version