English

Cusp forms without complex multiplication as $p$-adic limits

Number Theory 2025-02-07 v2

Abstract

In 2016, Ahlgren and Samart used the theory of holomorphic modular forms to obtain lower bounds on pp-adic valuations related to the Fourier coefficients of three cusp forms. In particular, their work strengthened a previous result of El-Guindy and Ono which expresses a cusp form as a pp-adic limit of weakly holomorphic modular forms. Subsequently, Hanson and Jameson extended Ahlgren and Samart's result to all one-dimensional cusp form spaces of trivial character and having a normalized form that has complex multiplication. Here we prove analogous pp-adic limits for several one-dimensional cusp form spaces of trivial character but whose normalized form does not have complex multiplication.

Keywords

Cite

@article{arxiv.2407.19374,
  title  = {Cusp forms without complex multiplication as $p$-adic limits},
  author = {Dalen Dockery},
  journal= {arXiv preprint arXiv:2407.19374},
  year   = {2025}
}

Comments

Minor revisions based on referee's suggestions; to appear in The Ramanujan Journal