English

On the geometric Serre weight conjecture for Hilbert modular forms

Number Theory 2025-03-10 v2

Abstract

Let pp be a prime, FF be a totally real field in which pp is unramified and ρ:Gal(F/F)GL2(Fp)\rho: \mathrm{Gal}(\overline{F}/F)\rightarrow \mathrm{GL}_2(\overline{\mathbb{F}}_p) be a totally odd, irreducible, continuous representation. The geometric Serre weight conjecture formulated by Diamond and Sasaki can be viewed as a geometric variant of the Buzzard-Diamond-Jarvis conjecture, where they have the notion of geometric modularity in the sense that ρ\rho arises from a mod pp Hilbert modular form and algebraic modularity in the sense of Buzzard-Diamond-Jarvis. Diamond and Sasaki conjecture that if ρ\rho is geometrically modular of weight (k,l)Z2Σ×ZΣ(k,l)\in \mathbb{Z}^\Sigma_{\geq 2}\times\mathbb{Z}^\Sigma and kk lies in the minimal cone, then ρ\rho is algebraically modular of the same weight, where Σ\Sigma is the set of embeddings from FF into Q\overline{\mathbb{Q}}. We prove the conjecture without parity hypotheses for real quadratic fields FF in which p5p \geq 5 is inert, and for totally real fields FF in which pmin{5,[F:Q]}p \geq \min\{5, [F:\mathbb{Q}]\} totally splits.

Keywords

Cite

@article{arxiv.2501.13585,
  title  = {On the geometric Serre weight conjecture for Hilbert modular forms},
  author = {Siqi Yang},
  journal= {arXiv preprint arXiv:2501.13585},
  year   = {2025}
}

Comments

Title and abstract updated for clarity; minor typos fixed. No significant changes to the main content

R2 v1 2026-06-28T21:14:43.027Z