The Sup-norm of Holomorphic Cusp Forms
2014
Let $f$ be a normalized holomorphic cusp form with a square-free level $N$ and weight $k$. Using a pre-trace formula, we establish a sup-norm bound of $f$ such that $\|y^kf(z)\|_{\infty} \ll N^{-1/6+e}$ where the trivial bound is $\|y^kf(z)\|_{\infty} \ll 1$. This result is an analog of a similar bound in Maas form case.
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