On higher moments of Hecke eigenvalues attached to cusp forms

Hua, Guodong

Czechoslovak Mathematical Journal, Tome 72 (2022) no. 4, pp. 1055-1064.

Résumé

Let $f$, $g$ and $h$ be three distinct primitive holomorphic cusp forms of even integral weights $k_{1}$, $k_{2}$ and $k_{3}$ for the full modular group $\Gamma ={\rm SL}(2,\mathbb {Z})$, respectively, and let $\lambda _{f}(n)$, $\lambda _{g}(n)$ and $\lambda _{h}(n)$ denote the $n$th normalized Fourier coefficients of $f$, $g$ and $h$, respectively. We consider the cancellations of sums related to arithmetic functions $\lambda _{g}(n)$, $\lambda _{h}(n)$ twisted by $\lambda _{f}(n)$ and establish the following results: $$ \sum _{n\leq x}\lambda _{f}(n)\lambda _{g}(n)^{i}\lambda _{h}(n)^{j} \ll _{f,g,h,\varepsilon } x^{1- 1/2^{i+j} +\varepsilon } $$ for any $\varepsilon >0$, where $1\leq i\leq 2$, $j\geq 5$ are any fixed positive integers.

Détail

DOI : 10.21136/CMJ.2022.0330-21

Classification : 11F11, 11F30, 11F66
Keywords: Hecke eigenform; Fourier coefficient; Rankin-Selberg $L$-function