Fourier coefficients of three-dimensional vector-valued modular forms

Details Fourier coefficients of three-dimensional vector-valued modular forms Fourier coefficients of three-dimensional vector-valued modular forms

2012-01-25

arxiv.org/abs/1201.5165v1

Mathematics

Number Theory

AMS-LaTeX, 22 pages

Scientific paper

A thorough analysis is made of the Fourier coefficients for vector-valued modular forms associated to three-dimensional irreducible representations of the modular group. In particular, the following statement is verified for all but a finite number of equivalence classes: if a vector-valued modular form associated to such a representation has rational Fourier coefficients, then these coefficients have "unbounded denominators", i.e. there is a prime number p, depending on the representation, which occurs to an arbitrarily high power in the denominators of the coefficients. This provides a verification in the three-dimensional setting of a generalization of a long-standing conjecture about noncongruence modular forms.

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