Local Converse Theorems for $k$-Middle Supercuspidal Representations of $p$-adic $\text{GL}(kn)$

Source abstract

Let $\text{F}$ be a non-archimedean local field of characteristic zero with residual characteristic $p$. In this paper, we study local converse theorems for $k$-middle supercuspidal representations of $\text{GL}(kn, \text{F})$ via explicit computations of twisted gamma factors on the Galois side, under the assumptions $p \nmid kn$ and $q_{\text{F}}>(k-1)^2$. Our results provide further evidence for a conjecture of the third-named author and Stevens on depth bounds for the twisting representations in the local converse theorem. For odd $k \ge 3$, we obtain infinitely many families of supercuspidal representations for which the bound $\left\lfloor \frac{kn}{2} \right\rfloor$ in the local converse theorem is not sharp.