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arXiv · 2609.27715

Zero density estimates for $\mathrm{GL}_2$ automorphic $L$-functions

Catherine Cossaboom
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Abstract

We prove zero density estimates for $L$-functions of cuspidal automorphic representations $π$ of $\mathrm{GL}_2(\mathbb{A}_{\mathbb{Q}})$. We show that $N_π(σ, T) \ll T^{\frac{5}{2}(1 - σ) + o(1)}$, where $N_π(σ, T)$ denotes the number of zeros $ρ= β+ iγ$ of $L(s,π)$ with $β\geq σ$ and $|γ| \leq T$. The key input is an extension of the Guth$\unicode{x2013}$Maynard argument to Dirichlet polynomials whose coefficients satisfy a weaker $\ell^q$ bound.

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Catherine Cossaboom. 2026-09-23. Zero density estimates for $\mathrm{GL}_2$ automorphic $L$-functions. https://arxiv.org/abs/2609.27715

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