The modulo distinction problem for D*

Abstract

Let $F$ be a nonarchimedean local field of characteristic zero and residue characteristic $p$. Let $E$ be a quadratic field extension of $F$. Let $D$ be the unique quaternion division algebra defined over $F$. Let $G=\GL_{2}(E)$ and $H=D^{\times }$. This paper studies the modulo distinction problem for the pair $(G,H)$ with $\ell \ne p$, which gives a complete classification of $H$-distinguished representations of $G$, including the cases $\ell =2$ and $p=2$. In terms of type theory, we give a complete classification of $H$-distinguished supercuspidal representations when $p$ is odd.