6 research outputs found

    Congruences modulo prime powers of Hecke eigenvalues in level 11

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    We continue the study of strong, weak, and dcdc-weak eigenforms introduced by Chen, Kiming, and Wiese. We completely determine all systems of Hecke eigenvalues of level 11 modulo 128128, showing there are finitely many. This extends results of Hatada and can be considered as evidence for the more general conjecture formulated by the author together with Kiming and Wiese on finiteness of systems of Hecke eigenvalues modulo prime powers at any fixed level. We also discuss the finiteness of systems of Hecke eigenvalues of level 11 modulo 99, reducing the question to the finiteness of a single eigenvalue. Furthermore, we answer the question of comparing weak and dcdc-weak eigenforms and provide the first known examples of non-weak dcdc-weak eigenforms.Comment: 28 pages; Minor revisio
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