Quadratic minima and modular forms

Details Quadratic minima and modular forms Quadratic minima and modular forms

1998-01-14

arxiv.org/abs/math/9801072v3

Exp. Math., 7 (1998) 257-274

Mathematics

Number Theory

To appear in "Experimental Mathematics". 25 pages. Section 5 cuts omit "weakly level 1" results, since weakly level 1 => level

Scientific paper

We give upper bounds on the size of the gap between the constant term and the next non-zero Fourier coefficient of an entire modular form of given weight for \Gamma_0(2). Numerical evidence indicates that a sharper bound holds for the weights h \equiv 2 . We derive upper bounds for the minimum positive integer represented by level two even positive-definite quadratic forms. Our data suggest that, for certain meromorphic modular forms and p=2,3, the p-order of the constant term is related to the base-p expansion of the order of the pole at infinity, and they suggest a connection between divisibility properties of the Ramanujan tau function and those of the Fourier coefficients of 1/j.

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