## Abstract

Let k be a nonnegative integer. Let K be a number field and OK be the ring of integers of K. Let ℓ ≥ 5 be a prime and v be a prime ideal of OK over ℓ. Let f be a modular form of weight k + 1/2 on Γ 0(4) such that its Fourier coefficients are in OK. In this article, we study sufficient conditions that if f has the form f(z)Ξ∑∞ n=1 ∑ t i=1 af(sin2)q sin2 (mod v) with square-free integers si, then f is congruent to a linear combination of iterated derivatives of a single theta function modulo v.

Original language | English |
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Pages (from-to) | 1320-1336 |

Number of pages | 17 |

Journal | Open Mathematics |

Volume | 20 |

Issue number | 1 |

DOIs | |

Publication status | Published - 2022 Jan 1 |

## Keywords

- Fourier coefficients of modular forms
- Galois representations
- modular forms of half-integral weight
- theta functions

## ASJC Scopus subject areas

- Mathematics(all)

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