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arXiv 2104.09909math.NT
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三次和四次Dirichlet $L$ -函数矩的界

Bounds for moments of cubic and quartic Dirichlet $L$-functions

Peng Gao, Liangyi Zhao

摘要:

研究了三次和四次本原Dirichlet $L$ -函数族中心值的$2k$阶矩.我们建立尖锐的下界所有真正的$k \geq 1/2$无条件的立方的情况下,并根据Lindelöf假设的四次情况。在广义黎曼假设(GRH)下,我们还建立了三次和四次情形下所有实数$0 \leq k<1/2$的精确下界和所有实数$k \geq 0$的精确上界.作为我们的结果的应用,我们建立了相应的$L$值的定量非零结果。

英文摘要:

We study the $2k$-th moment of central values of the family of primitive cubic and quartic Dirichlet $L$-functions. We establish sharp lower bounds for all real $k \geq 1/2$ unconditionally for the cubic case and under the Lindelöf hypothesis for the quartic case. We also establish sharp lower bounds for all real $0 \leq k<1/2$ and sharp upper bounds for all real $k \geq 0$ for both the cubic and quartic cases under the generalized Riemann hypothesis (GRH). As an application of our results, we establish quantitative non-vanishing results for the corresponding $L$-values.

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