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Non-vanishing of geodesic periods of automorphic forms
We prove that one hundred percent of closed geodesic periods of a Maa{\ss} form for the modular group are non-vanishing when ordered by length. We present applications to the non-vanishing of central values of Rankin--Selberg $L$-functions. Similar results for holomorphic forms for general Fuchsian groups of the first kind with …