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Mathematics > Number Theory

arXiv:2510.11191 (math)
[Submitted on 13 Oct 2025 ]

Title: The Second Moment of $\mathrm{GL}_3 \times \mathrm{GL}_2$ $L$-functions at Special Points

Title: $\mathrm{GL}_3 \times \mathrm{GL}_2$ $L$ 函数在特殊点的二阶矩

Authors:Zhi Qi
Abstract: Let $\phi$ be a fixed Hecke--Maass form for $\mathrm{SL}_3 (\mathbb{Z})$ and $u_j $ traverse an orthonormal basis of Hecke--Maass forms for $\mathrm{SL}_2 (\mathbb{Z}) $. Let $1/4+t_j^2$ be the Laplace eigenvalue of $u_j $. In this paper, we prove the mean Lindel\"of hypothesis for the second moment of $ L (1/2+it_j, \phi \times u_j) $ on $ T < t_j \leqslant T + \sqrt{T} $. Previously, this was proven by Young on $ t_j \leqslant T$. Our approach is more direct as we do not apply the Poisson summation formula to detect the `Eisenstein--Kloosterman' cancellation.
Abstract: 设$\phi$为$\mathrm{SL}_3 (\mathbb{Z})$的固定 Hecke--Maass 型函数,并且$u_j $遍历$\mathrm{SL}_2 (\mathbb{Z}) $的 Hecke--Maass 型函数的正交规范基。设$1/4+t_j^2$为$u_j $的 Laplace 特征值。 在本文中,我们证明了关于$ L (1/2+it_j, \phi \times u_j) $在$ T < t_j \leqslant T + \sqrt{T} $上的二阶矩的平均 Lindelöf 假设。 此前,这是由 Young 在$ t_j \leqslant T$上证明的。 我们的方法更为直接,因为我们没有应用 Poisson 求和公式来检测 `Eisenstein--Kloosterman' 取消效应。
Comments: 22 pages
Subjects: Number Theory (math.NT)
Cite as: arXiv:2510.11191 [math.NT]
  (or arXiv:2510.11191v1 [math.NT] for this version)
  https://doi.org/10.48550/arXiv.2510.11191
arXiv-issued DOI via DataCite
Journal reference: Math. Ann., 393(1):1429--1457, 2025
Related DOI: https://doi.org/10.1007/s00208-025-03267-7
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Submission history

From: Zhi Qi [view email]
[v1] Mon, 13 Oct 2025 09:23:13 UTC (27 KB)
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