English

Deformations of pseudocharacters and Mazur's finiteness condition

Number Theory 2026-01-12 v2

Abstract

We show that deformation rings RpsR^{\mathrm{ps}} of GG-pseudocharacters of a profinite group Γ\Gamma are noetherian, when Γ\Gamma satisfies Mazur's finiteness condition. The proof proceeds by reduction to the case when Γ\Gamma is finitely generated, where the result was previously established by the second author. This enables us to extend our work on moduli spaces of RpsR^{\mathrm{ps}}-condensed representations of a finitely generated profinite group Γ\Gamma, to the groups satisfying Mazur's finiteness condition. We also show that the functor from rigid analytic spaces over Qp\mathbb{Q}_p to sets, which associates to a rigid space YY the set of continuous O(Y)\mathcal{O}(Y)-valued GG-pseudocharacters of Γ\Gamma is representable by a quasi-Stein rigid analytic space, and we study its general properties. We expect these results to be useful, when studying global Galois representations.

Keywords

Cite

@article{arxiv.2506.10901,
  title  = {Deformations of pseudocharacters and Mazur's finiteness condition},
  author = {Vytautas Paškūnas and Julian Quast},
  journal= {arXiv preprint arXiv:2506.10901},
  year   = {2026}
}

Comments

17 pages. Revised version after the referee report. Minor changes