On sparsity of positive-definite automorphic forms within a family

Details On sparsity of positive-definite automorphic forms within a family On sparsity of positive-definite automorphic forms within a family

2012-01-02

arxiv.org/abs/1201.0429v1

Mathematics

Number Theory

26 pages

Scientific paper

It is known due to Baker and Montgomery that almost all Fekete polynomials under certain ordering have at least one zero on the interval (0, 1). In terms of the positive-definiteness, Fekete polynomial has no zero on the interval (0, 1) if and only if the corresponding automorphic form is positive-definite. On generalizing their result, we formulate an axiomatic result about sets of automorphic forms satisfying certain averages when suitably ordered, which ensures that almost all forms are not positive-definite within such sets. We then apply the result to various families, including the family of holomorphic cusp forms, the family of the Hilbert class characters of imaginary quadratic fields, and the family of elliptic curves.

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