New test vector for Waldspurger's period integral, relative trace formula, and hybrid subconvexity bounds (1810.11564v2)

Abstract: In this paper we give quantitative local test vectors for Waldspurger's period integral (i.e., a toric period on $\text{GL}2$) in new cases with joint ramifications. The construction involves minimal vectors, rather than newforms and their variants. This paper gives a uniform treatment for the matrix algebra and division algebra cases under mild assumptions, and establishes an explicit relation between the size of the local integral and the finite conductor $C(\pi\times\pi{\chi^{-1}})$. As an application, we combine the test vector results with the relative trace formula, and prove a hybrid type subconvexity bound which can be as strong as the Weyl bound in proper range.