Subconvexity bound for $GL(2)$ L-functions: \lowercase{t}-aspect

Abstract

Let $f$ be a holomorphic Hecke eigenform or a Hecke-Maass cusp form for the full modular group $SL(2,\mathbb{Z})$. In this paper we shall use circle method to prove the Weyl exponent for $GL(2)$ $L$-functions. We shall prove that \[ L \left( \frac{1}{2} + it, f \right) \ll_{f, ε} \left( 2 + |t|\right)^{1/3 + ε}, \] for any $\hat{I}\mu >0.$