Non-admissible smooth irreducible representations of $\mathrm{GL}_2(F)$ for totally ramified extensions $F/\mathbb{Q}_p$

Abstract

Let $p\geq 5$, and let $F/\mathbb{Q}_p$ be a nontrivial finite totally ramified extension. We construct a non-admissible smooth irreducible representation of $\mathrm{GL}_2(F)$ over $\overline{\mathbb{F}}_p$. The construction uses representations of $\mathrm{GL}_2(\mathcal{O}_F)$ on which the first principal congruence subgroup acts nontrivially, together with a deformation of a diagram indexed by $\mathbb{Z}$.