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arXiv 2109.10396math.NT
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函数域上$L$ -函数负矩的比猜想和上界

The Ratios Conjecture and upper bounds for negative moments of $L$-functions over function fields

Hung M. Bui, Alexandra Florea, Jonathan P. Keating

摘要:

证明了函数域上二次Dirichlet $L$ -函数族的比率猜想的特殊情况。更具体地说,我们研究的平均$L(1/2+α,χ_D)/L(1/2+β,χ_D)$,当$D$变化的一元,无平方多项式的次数$2g+1$ $\mathbb{F}_q[x]$,作为$g \to \infty$,我们得到一个渐近公式时,$\Re β\gg g^{-1/2+\varepsilon}$。研究了$2$在$2$上的乘积和$3$在$3$上的乘积的平均,得到了分母的位移分别大于$g^{-1/4+\varepsilon}$和$g^{-1/6+\varepsilon}$的实部时的渐近公式.证明的主要内容是得到$L$ --函数的负矩的上界。我们得到的上界预计在上述范围内几乎是尖锐的。作为应用,我们在$(-2,2)$中的傅立叶变换的支持下,恢复了族中一能级零点密度的渐近公式。

英文摘要:

We prove special cases of the Ratios Conjecture for the family of quadratic Dirichlet $L$--functions over function fields. More specifically, we study the average of $L(1/2+α,χ_D)/L(1/2+β,χ_D)$, when $D$ varies over monic, square-free polynomials of degree $2g+1$ over $\mathbb{F}_q[x]$, as $g \to \infty$, and we obtain an asymptotic formula when $\Re β\gg g^{-1/2+\varepsilon}$. We also study averages of products of $2$ over $2$ and $3$ over $3$ $L$--functions, and obtain asymptotic formulas when the shifts in the denominator have real part bigger than $g^{-1/4+\varepsilon}$ and $g^{-1/6+\varepsilon}$ respectively. The main ingredient in the proof is obtaining upper bounds for negative moments of $L$--functions. The upper bounds we obtain are expected to be almost sharp in the ranges described above. As an application, we recover the asymptotic formula for the one-level density of zeros in the family with the support of the Fourier transform in $(-2,2)$.

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