Differential operators for harmonic weak Maass forms and the vanishing of Hecke eigenvalues

Details Differential operators for harmonic weak Maass forms and the vanishing of Hecke eigenvalues Differential operators for harmonic weak Maass forms and the vanishing of Hecke eigenvalues

2008-02-07

arxiv.org/abs/0802.0963v3

Mathematics

Number Theory

formerly "Differential operators and harmonic weak Maass forms"; Theorem 1.4 corrected

Scientific paper

For integers $k\geq 2$, we study two differential operators on harmonic weak Maass forms of weight $2-k$. The operator $\xi_{2-k}$ (resp. $D^{k-1}$) defines a map to the space of weight $k$ cusp forms (resp. weakly holomorphic modular forms). We leverage these operators to study coefficients of harmonic weak Maass forms. Although generic harmonic weak Maass forms are expected to have transcendental coefficients, we show that those forms which are "dual" under $\xi_{2-k}$ to newforms with vanishing Hecke eigenvalues (such as CM forms) have algebraic coefficients. Using regularized inner products, we also characterize the image of $D^{k-1}$.

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