Periodicity properties of coefficients of half integral weight modular forms

Details Periodicity properties of coefficients of half integral weight modular forms Periodicity properties of coefficients of half integral weight modular forms

2001-12-04

arxiv.org/abs/math/0112320v1

Mathematics

Number Theory

Scientific paper

In this paper we prove a theorem about the coefficients in a block of a half integral weight modular form. We show that the result of Serre and Stark for weight 1/2 forms does not generalize to higher higher weights. Let f be a half integral weight cusp form of weight at leat 3/2. We consider blocks of coefficients of f and prove that, under some weak assumptions on f, if such a coefficient block is periodic when considered as a function of in the square root of its index, then it must vanish completely. The proof is analytic in nature and uses Shimura's lifting theorem together with estimates on the order of growth of Fourier coefficients of modular forms.

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