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arXiv 1503.05520math.NT
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模群的三维非本原表示及其相应的模形式

Three-dimensional imprimitive representations of the modular group and their associated modular forms

Cameron Franc, Geoffrey Mason

摘要:

本文利用作者以前关于向量值模形式的结果,研究了某些非同余模形式。我们证明了这些形式有无界的同余式,并在某些情况下,我们验证了Atkin-Swinnerton-Dyer型同余满足这些形式的傅里叶系数。我们的结果依赖于关于模群的群论事实,它的非本原三维表示的详细研究,以及它们相关的向量值模形式的理论。对于证明的同余式,我们还利用必不可少的结果卡茨。

英文摘要:

This paper uses previous results of the authors on vector-valued modular forms to study certain non-congruence modular forms. We prove that these forms have unbounded denominators, and in certain cases we verify congruences of Atkin--Swinnerton-Dyer type satisfied by the Fourier coefficients of these forms. Our results rest on group-theoretic facts about the modular group, a detailed study of its imprimitive three-dimensional representations, and the theory of their associated vector-valued modular forms. For the proof of the congruences we also make essential use of a result of Katz.

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