Mixed moment and joint non-vanishing of $\mathrm{GL}(3)\times\mathrm{GL}(1)$ and $\mathrm{GL}(1)$ $L$-functions

Source abstract

In this article, we study the mixed-moment problem for the product of central values of two $L$-functions twisted by a Dirichlet character of large conductor $q$. Precisely, for a fixed $\mathrm{SL}_3(\mathbb{Z})$ Hecke-Maass cusp form $π$, we asymptotically evaluate the first moment, with $\textit{power-saving}$ error term for the product of central $L$-values $L(1/2, π\timesχ)\overline{L(1/2, χ)}$ averaged over the $\textit{full family}$ $\{χ\,(\mathrm{mod}\,{q}): Q\leq q\leq 2Q\}$ of primitive Dirichlet characters modulo $q$. And as a consequence, we also established the simultaneous non-vanishing of the aforementioned central $L$-values.