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On the Petersson inner products of Fourier–Jacobi coefficients and Hecke eigenvalues of Siegel cusp forms

Volume 197 / 2021

Balesh Kumar, Biplab Paul Acta Arithmetica 197 (2021), 21-35 MSC: 11F46, 11F50. DOI: 10.4064/aa190326-10-2 Published online: 1 October 2020


Let $F$ and $G$ be Siegel cusp forms of weight $k$ and degree $n \gt 1$ with Fourier–Jacobi coefficients $f_m$ and $g_m$ respectively for all $m \in \mathbb N $. Assume that the Petersson inner products $\langle f_m, g_m \rangle $ are real for all $m \in \mathbb N $. We prove that if $ \langle F, G \rangle = 0$ and not all $\langle f_m, g_m \rangle $ are zero, the sequence $ \{ \langle f_m, g_m \rangle \}_{m \in \mathbb N }$ changes sign infinitely often. When $\langle F, G \rangle \ne 0$, we show that $ | \langle f_m, g_m \rangle | \gt c m^{k-1}$ for infinitely many $m\in \mathbb N $, where $c \gt 0$ is a constant depending on $F$ and $G$. This generalizes a result of Kohnen. We also investigate similar properties of these Petersson inner products in arithmetic progressions. In this case, our results strengthen a result of Gun and Kumar. Finally, we study simultaneous non-vanishing of the Hecke eigenvalues of Siegel cusp forms of degree $2$.


  • Balesh KumarDepartment of Mathematics
    Indian Institute of Technology Ropar
    Rupnagar, Punjab, 140001, India
  • Biplab PaulFaculty of Mathematics
    Kyushu University
    744 Motooka, Nishi-ku
    Fukuoka-shi, 819-0395, Japan

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