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arXiv · 2010.06297

Arithmetic properties of Fourier coefficients of meromorphic modular forms

Steffen Löbrich·Markus Schwagenscheidt
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Abstract

We investigate integrality and divisibility properties of Fourier coefficients of meromorphic modular forms of weight $2k$ associated to positive definite integral binary quadratic forms. For example, we show that if there are no non-trivial cusp forms of weight $2k$, then the $n$-th coefficients of these meromorphic modular forms are divisible by $n^{k-1}$ for every natural number $n$. Moreover, we prove that their coefficients are non-vanishing and have either constant or alternating signs. Finally, we obtain a relation between the Fourier coefficients of meromorphic modular forms, the coefficients of the $j$-function, and the partition function.

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Steffen Löbrich, Markus Schwagenscheidt. 2020-10-13. Arithmetic properties of Fourier coefficients of meromorphic modular forms. https://arxiv.org/abs/2010.06297

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