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arXiv · 2409.12474

Non-vanishing and One Level Density for Dirichlet $L$-functions Along Short Averages

Debmalya Basak
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Abstract

Assuming the Generalized Riemann Hypothesis, it is known that at least half of the central values $L(\frac{1}{2},χ)$ are non-vanishing as $χ$ ranges over primitive characters modulo $q$. Unconditionally, this is known on average over both $χ$ modulo $q$ and $Q/2 \leq q \leq 2Q$. We prove that for any $δ>0$, there exist $η_1,η_2>0$ depending on $δ$ such that the non-vanishing proportion for $L(\frac{1}{2},χ)$ as $χ$ ranges modulo $q$ with $q$ varying in short intervals of size $Q^{1-η_1}$ around $Q$ and in arithmetic progressions with moduli up to $Q^{η_2}$ is larger than $\frac{1}{2}-δ$. Furthermore, by studying the one-level density of low-lying zeros of $L(s, χ)$, we show that under the Generalized Riemann Hypothesis, non-vanishing proportions exceeding $\frac{1}{2}$ can be obtained while still averaging over short ranges of $q$.

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Debmalya Basak. 2025-11-10. Non-vanishing and One Level Density for Dirichlet $L$-functions Along Short Averages. https://arxiv.org/abs/2409.12474

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