Rankin--Selberg integrals of opposite conductor--one newforms

Abstract

Let $F$ be a nonarchimedean local field of characteristic zero and let $n\ge 2$. For $r=n,n+1$, let ${\Pi }_r$ be an irreducible tempered representation of ${\mathrm{GL}}_r(F)$ of conductor one and with trivial central character. We evaluate the Rankin--Selberg integral of opposite newforms in ${\Pi }_{n+1}\times {\Pi }_n$ explicitly and show that its central value is nonzero. As an application, this implies a case of Disegni--Zhang's conjecture on the nonvanishing of local relative characters.

10 pages, comments welcome!