Simultaneous non-vanishing of GL(3)×GL(2)GL(3)\times GL(2) and GL(2) LL-functions

preprint2011arXivOpen access

Abstract

Fix gg a Hecke-Maass form for SL3(Z)SL_3(\mathbb{Z}). Let qq be any large prime number. In the family of holomorphic newforms ff of level qq and fixed weight, we find the average value of the product $L(\half,g\times f)L(\half,f)$. From this we derive a result on the simultaneous non-vanishing of these LL-functions at the central point.

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