On some estimates involving Fourier coefficients of Maass cusp forms

Qingfeng Sun, Hui Wang

Let $f$ be a Hecke-Maass cusp form for $\mathrm{S}{\mathrm{L}}_2(\mathbb{Z})$ with Laplace eigenvalue ${\lambda }_f(\Delta )=1/4+{\mu }^2$ and let ${\lambda }_f(n)$ be its $n$-th normalized Fourier coefficient. It is proved t…