Non-vanishing of Maass form L-functions at the critical point

Abstract: In this paper, we consider the family ${L_j(s)}{j=1}^{\infty}$ of $L$-functions associated to an orthonormal basis ${u_j}{j=1}^{\infty}$ of even Hecke-Maass forms for the modular group $SL(2, Z)$ with eigenvalues ${\lambda_j=\kappa_{j}^{2}+1/4}_{j=1}^{\infty}$. We prove the following effective non-vanishing result: At least $50 \%$ of the central values $L_j(1/2)$ with $\kappa_j \leq T$ do not vanish as $T\rightarrow \infty$. Furthermore, we establish effective non-vanishing results in short intervals.