Dirichlet series of Rankin-Cohen Brackets

Details Dirichlet series of Rankin-Cohen Brackets Dirichlet series of Rankin-Cohen Brackets

2010-08-30

arxiv.org/abs/1008.5184v1

Mathematics

Number Theory

Scientific paper

Given modular forms $f$ and $g$ of weights $k$ and $\ell$, respectively, their Rankin-Cohen bracket $[f,g]^{(k, \ell)}_n$ corresponding to a nonnegative integer $n$ is a modular form of weight $k +\ell +2n$, and it is given as a linear combination of the products of the form $f^{(r)} g^{(n-r)}$ for $0 \leq r \leq n$. We use a correspondence between quasimodular forms and sequences of modular forms to express the Dirichlet series of a product of derivatives of modular forms as a linear combination of the Dirichlet series of Rankin-Cohen brackets.

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