Extending the unconditional support in an Iwaniec-Luo-Sarnak family

Abstract

We study the harmonically weighted one-level density of low-lying zeros of $L$-functions in the family of holomorpic newforms of fixed even weight $k$ and prime level $N$ tending to infinity. For this family, Iwaniec, Luo and Sarnak proved that the Katz--Sarnak prediction for the one-level density holds unconditionally when the support of the Fourier transform of the implied test function is contained in $(-\frac{3}{2},\frac{3}{2})$. In this paper, we extend this admissible support to $(-{\Theta }_k,{\Theta }_k)$, where ${\Theta }_2=1.866\dots$ and ${\Theta }_k$ tends monotonically to $2$ as $k$ tends to infinity. This is asymptotically as good as the best known GRH result. The main novelty in our analysis is the use of zero-density estimates for Dirichlet $L$-functions.

arXiv comment12 pages

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