Taekyun Kim
Recently, the two variable $q$-$L$-functions which interpolate the generalized $q$-Bernoulli polynomials associated with $χ$ are introduced and studied, cf. [2]. In this paper, we construct multiple Dirichlet's $q$-$L$-function which interpolates the generalized multiple $q$-Bernoulli numbers attached to $χ$ at negative integer and study its properties.
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We prove a result related to Dirichlet spectrum for simultaneous approximation to two real numbers in Euclidean norm and badly or very well approximability.
We study the relation between the size of $L(1,χ)$ and the width of the zero-free interval to the left of that point.
A note on Dirichlet-like series attached to polynomials
该研究引入并研究了附属于周期函数与多项式对的类Dirichlet函数，其推广了标准Dirichlet L-函数，具备全复平面全纯、负整数处取值简单的相似性质。
We prove an asymptotic formula for the fourth power mean of Dirichlet L-functions averaged over primitive characters to modulus q and over t\in [0,T] which is particularly effective when q \ge T. In this range the correct order of magnitude was not previously known.
A note on the zeros of $L$-functions associated to fixed-order Dirichlet characters
该研究利用Dirichlet $L$-函数的Weyl界推导固定阶Dirichlet特征族对应$L$-函数的零点密度估计，在σ距临界线足够远时改进了作者此前的界。
A note on zero density results implying large value estimates for Dirichlet polynomials
本文证明黎曼 zeta 函数的零密度估计可蕴含 Dirichlet 多项式的大值估计，填补了反向蕴含关系的空白。
In this note, we prove that given a Hecke-Maass cusp form $f$ for $SL_2(\mathbb{Z})$ and a sufficiently large integer $q=q_1q_2$ with $q_j\asymp \sqrt{q}$ being prime numbers for $j=1,2$, there exists a primitive Dirichlet character $χ$ of conductor $q$ such that $L\left(\frac{1}{2},f\otimes χ\right)L\left(\frac{1}{2},χ\right)\neq 0$. To prove this, we establish asymptotic formulas of $L\left(\frac{1}{2},f\otimes χ\right)L\left(\frac{1}{2},χ\right)$ over the family of even primitive Dirichlet characters $χ$ of conductor $q$ for more general $q$.
A Note on Twisted Moments of Dirichlet $L$-functions
本文针对有限域多项式环上的本原Dirichlet特征，推导了带一扭和两扭的Dirichlet $L$-函数扭二阶矩的渐近公式，推广了Djanković此前在有理函数域上的相关研究结果。
We survey the classical results of the Dirichlet Approximation Theorem.
We consider Bernoulli distributions and their regularizations, which are measures on the $p$-adic integers $\mathbb{Z}_p$. It is well known that their Mellin transform can be used to define $p$-adic $L$-functions. We show that for $p>2$ one of the regularized Bernoulli distributions is particularly simple and equal to a measure on $\mathbb{Z}_p$ that takes the values $\pm \frac{1}{2}$ on clopen balls. We apply this to $p$-adic $L$-functions for Dirichlet characters of $p$-power conductor and obtain Dirichlet series expansions similar to the complex case. Such expansions were studied by D. Delb…
A note on exceptional characters and non-vanishing of Dirichlet $L$-functions
本文在存在例外实本原 Dirichlet 特征的假设下，证明大范围素数模上几乎所有 Dirichlet 特征的 $L$-函数在中心点非零。
First, we define the multiple Dirichlet product and study the properties of it. From those properties, we obtain a zero-free region of a multiple Dirichlet series and a multiple Dirichlet series expression of the reciprocal of a multiple Dirichlet series.
This note pushes further the discussion about relations between Dirichlet improvable, badly approximable and singular points held in recent joint work with Beresnevich, Guan, Velani and Ramirez, by considering Diophantine sets extending the notion of badly approximability.
In this article we study analytic properties of the multiple Dirichlet series associated to additive and Dirichlet characters. For the multiple Dirichlet series associated to additive characters, the meromorphic continuation is established via obtaining translation formulas satisfied by these multiple Dirichlet series. While it seems difficult to obtain such a translation formula for the multiple Dirichlet series associated to Dirichlet characters, we rely on their intrinsic connection with the multiple Dirichlet series associated to additive characters in order to investigate their analytic c…
In this article, we obtain the analytic continuation of the multiple shifted Lucas zeta function, multiple Lucas $L$-function associated to Dirichlet characters and additive characters. We then compute a complete list of exact singularities and residues of these functions at these poles. Further, we show the rationality of the multiple Lucas $L$-functions associated with quadratic characters at negative integer arguments.
Let $π$ be an irreducible unitary cuspidal representation of $GL_m({\Bbb A}_{\Bbb Q})$ and $L(s,\,π)$ be the global $L-$function attached to $π$. If ${\rm Re}(s)>1$, $L(s,\,π)$ has a Dirichlet series expression. When $π$ is self-contragradient, all the coefficients of Dirichlet series are real. In this note, we shall give non-trivial lower bounds for the number of positive and negative coefficients respectively, which is an improvement on the recent work of Jianya Liu and Jie Wu.
Let $χ$ be a real and non-principal Dirichlet character, $L(s,χ)$ its Dirichlet $L$-function and let $p$ be a generic prime number. We prove the following result: If for some $0\leq σ<1$ the partial sums $\sum_{p\leq x}χ(p)p^{-σ}$ change sign only for a finite number of $x$, then there exists $ε>0$ such that $L(s,χ)$ has no zeros in the half plane $Re(s)>1-ε$.
We study the natural boundary of a random Dirichlet series associated with Goldbach numbers.
We survey some recent developments in the analytic theory of multiple Dirichlet series with arithmetical coefficients on the numerators.
Discrete restrictions from Laurent monomial systems for multiple Dirichlet series
研究引入一类项支撑于某簇、具欧拉乘积结构的特殊多重狄利克雷级数。
On certain multiple Dirichlet series
本文研究与二元三次型的预齐次向量空间相关的多重 Dirichlet 级数的解析性质。
In this paper, we discuss the parity result for multiple Dirichlet series which contains some special values of multiple zeta functions as special cases, Mordell--Tornheim type of multiple zeta values, zeta values of the root systems and so on. Moreover, we can give explicit expression in terms of lower series by using main theorem.
A multiple Dirichlet series in two variables is constructed as a Mellin transform of a higher order Eisenstein series. It is shown to extend to a meromorphic function and satisfy two independent functional equations.
We present other proofs, generalizations and analogues of the identities concerning multiple Dirichlet series by Tahmi and Derbal (2022). As applications, we obtain asymptotic formulas with remainder terms for certain related sums.
We investigate a relation between the Mordell-Tornheim type of multiple Dirichlet series and a confluent hypergeometric function. We prove it by applying the Mellin-Barnes integral formula. Also, main results in this paper contain two kinds of functional equations for double $L$-functions as a special case.
In this study, we construct the two-variable multiple Dirichlet q-L-function and two-variable multiple Dirichlet type Changhee q-L-function. These functions interpolate the q-Bernoulli polynomials and generalized Changhee q-Bernoulli polynomials. By using the Mellin transformation, we give an integral representation for the two-variable multiple Dirichlet type q-zeta function and the two variable multiple Dirichlet type Changhee q-L-function.
Convergence of multiple Dirichlet L-series
本文研究多个 Dirichlet L-级数的收敛性，利用 Abel 求和公式给出其在收敛区域的积分表示，并提及一项推广结果。
A Weyl group multiple Dirichlet series is a Dirichlet series in several complex variables attached to a root system Phi. The number of variables equals the rank r of the root system, and the series satisfies a group of functional equations isomorphic to the Weyl group W of Phi. In this paper we construct a Weyl group multiple Dirichlet series over the rational function field using n-th order Gauss sums attached to the root system of type A_2. The basic technique is to construct a rational function in r variables invariant under a certain action of W, and use this to build a ``local factor'' of…
Note on large quadratic character sums
本文在广义黎曼假设下，证明了二次狄利克雷特征和存在大值的Omega结果，深化了对该特征和极值行为的理解。
A note on large values of Dirichlet $L$-functions for characters of fixed order at $1/2<σ\leq 1$
本文通过简单论证，证明了固定阶本原特征的 Dirichlet $L$-函数在 $σ\in (1/2,1]$ 处存在推测性尖锐大小的大值，并给出了显式常数。
The Ratios conjecture for real Dirichlet characters and multiple Dirichlet series
本文在广义黎曼假设下，利用多重狄利克雷级数证明实狄利克雷特征族的单平移L函数比率猜想，扩展至非本原特征可增大平移范围，进而得到平移对数导数和的渐近公式。
Let Phi be a reduced root system of rank r. A Weyl group multiple Dirichlet series for Phi is a Dirichlet series in r complex variables s_1,...,s_r, initially converging for Re(s_i) sufficiently large, which has meromorphic continuation to C^r and satisfies functional equations under the transformations of C^r corresponding to the Weyl group of Phi. Two constructions of such series are available, one based on summing products of n-th order Gauss sums, the second based on averaging a certain group action over the Weyl group. In this paper we study these constructions and the relationship betwee…
We define a multiple Dirichlet series whose group of functional equations is the Weyl group of the affine Kac-Moody root system $\tilde{A}_n$, generalizing the theory of multiple Dirichlet series for finite Weyl groups. The construction is over the rational function field $\mathbb{F}_q(t)$, and is based upon four natural axioms from algebraic geometry. We prove that the four axioms yield a unique series with meromorphic continuation to the largest possible domain and the desired infinite group of symmetries.
Moments of real Dirichlet $L$-functions and multiple Dirichlet series
本文研究实Dirichlet $L$-函数$k$次矩相关的多重Dirichlet级数，证明其亚纯延拓性（$k\boldsymbol{\rm g}5$依赖广义Lindelöf假设），得到前三个矩的渐近公式并重现已有结果，方法简洁且直接符合配方预测。
Weyl group multiple Dirichlet series are Dirichlet series in $r$ complex variables, with analytic continuation to $\mathbb{C}^r$ and a group of functional equations isomorphic to the Weyl group of a reduced root system of rank $r$. Such series may be defined for any global field $K$, but in the case when $K$ is an algebraic function field they are expected to be, up to a variable change, rational functions in several variables. We verify the rationality of these functions in the case when $K=\mathbb{F}_q(T)$, and describe the denominators and support of the numerators.
Arithmetic Progressions of Squares and Multiple Dirichlet Series
本文研究计数平方数本原三项等差数列的二元多重 Dirichlet 级数，证明其在 $\mathbb{C}^2$ 上的亚纯延拓，并借助 Tauberian 方法获得相关平方数等差数列与圆锥曲线有理点的计数。
We investigate the Shintani zeta functions associated to the prehomogeneous spaces, the example under consideration is the set of $2 \times 2\times 2$ integer cubes. We show that there are three relative invariants under a certain parabolic group action, they all have arithmetic nature and completely determine the equivalence classes. We show that the associated Shintani zeta function coincides with the $A_3$ Weyl group multiple Dirichlet series. Finally, we show that the set of semi-stable integer orbits maps finitely and surjectively to a certain moduli space.
Multiple Dirichlet series associated with quadrics
本文定义了与二次曲面相关的多重 Dirichlet 级数，通过构造二次空间滤过、定义抛物群作用并应用非交换 Poisson 求和公式获得函数方程，并证明其函数方程群同构于 A3 型有限 Weyl 群。
This paper develops an analytic theory of Dirichlet series in several complex variables which possess sufficiently many functional equations. In the first two sections it is shown how straightforward conjectures about the meromorphic continuation and polar divisors of certain such series imply, as a consequence, precise asymptotics (previously conjectured via random matrix theory) for moments of zeta functions and quadratic L-series. As an application of the theory, in a third section, we obtain the current best known error term for mean values of cubes of central values of Dirichlet L-series.…
In this paper, we exhibit upper and lower bounds with explicit constants for some objects related to entire $L$-functions in the critical strip, under the generalized Riemann hypothesis. The examples include the entire Dirichlet $L$-functions $L(s,χ)$ for primitive characters $χ$.
Functional equations of axiomatic multiple Dirichlet series, Weyl groupoids, and quantum algebra
本文通过五条几何公理定义多重Dirichlet级数并推导其函数方程，将其与Weyl群oid关联，并应用于量子代数中的Nichols代数上同调研究。
We develop certain aspects of the theory of shifted multiple Dirichlet series and study their meromorphic continuations. These continuations are used to obtain explicit spectral first and second moments of Rankin-Selberg convolutions. One consequence is a Weyl type estimate for the Rankin-Selberg convolution of a holomorphic cusp form and a Maass form with spectral parameter $|t_j|\le T$, namely: $$ \left| L\left(\frac{1}{2}+ir, f\times u_j\right) \right| \ll_N T^{2/3+ε}, $$ uniformly, for $|r| \le T^{2/3}$, with the implied constant depending only on $f$ and the level $N$.
We define, and obtain the meromorphic continuation of, shifted Rankin-Selberg convolutions in one and two variables. As sample applications, this continuation is used to obtain estimates for single and double shifted sums and a Burgess-type bound for $L$-series associated to modular forms of arbitrary central character. Further applications are furnished by subsequent works by the authors and their colleagues.
In this note we define L-functions of finite graphs and study the particular case of finite cycles in the spirit of a previous paper that studied spectral zeta functions of graphs. The main result is a suggestive equivalence between an asymptotic functional equation for these L-functions and the corresponding case of the Generalized Riemann Hypothesis. We also establish a relation between the positivity of such functions and the existence of real zeros in the critical strip of the classical Dirichlet L-functions with the same character.
In this paper and its sequel \cite{DPP}, we investigate the precise relationship between the quadratic affine Weyl group multiple Dirichlet series in the sense of \cite{CG1, BD}, and those defined axiomatically by Whitehead \cite{White2} and \cite{White1}. In particular, we show that the axiomatic quadratic Weyl group multiple Dirichlet series of type $D_{\scriptscriptstyle 4}^{\scriptscriptstyle (1)}$ over rational function fields of odd characteristic admits meromorphic continuation to the interior of the corresponding complexified Tits cone. We shall also determine the polar divisor of this…
We obtain the formula for the twisted harmonic second moment of the $L$-functions associated with primitive Hecke eigenforms of weight 2. A consequence of our mean value theorem is reminiscent of recent results of Conrey and Young on the reciprocity formula for the twisted second moment of Dirichlet $L$-functions.
Let $W$ be the Weyl group of a simply-laced affine Kac-Moody Lie group, excepting $\tilde{A}_n$ for $n$ even. We construct a multiple Dirichlet series $Z(x_1, \ldots x_{n+1})$, meromorphic in a half-space, satisfying a group $W$ of functional equations. This series is analogous to the multiple Dirichlet series for classical Weyl groups constructed by Brubaker-Bump-Friedberg, Chinta-Gunnells, and others. It is completely characterized by four natural axioms concerning its coefficients, axioms which come from the geometry of parameter spaces of hyperelliptic curves. The series constructed this w…
Multiple Dirichlet series predictions for moments of $L$-functions: unitary, symplectic and orthogonal examples
本文用多元狄利克雷级数预测四类$L$-函数族的移位矩渐近公式，结果与CFKRS配方一致（除椭圆曲线二次扭动族需修正），并建立留数与配方项的一一对应。
Generalizing work of Polya, de Bruijn and Newman, we allow the backward heat equation to deform the zeros of quadratic Dirichlet L-functions. There is a real constant Λ_Kr (generalizing the de Bruijn-Newman constant Λ) such that for time t>=Λ_Kr all such L-functions have all their zeros on the critical line; for time t<Λ_Kr there exist zeros off the line. Under GRH, Λ_Kr<=0; we make the complementary conjecture 0<=Λ_Kr. Following the work of Csordas et. al. on Lehmer pairs of Riemann zeros, we use low-lying zeros of quadratic Dirichlet L-functions to show that -1.13* 10^{-7}<Λ_Kr. In the last …
In this note we investigate the problem of determining elements of the Selberg class from their Dirichlet series coefficients at the primes. We show that this is possible when the degree is one, but in general need an additional weak hypothesis on the Dirichlet series coefficients at squares of primes.
Counting number fields using multiple Dirichlet series
本文利用多重狄利克雷级数的解析技术，提出了一种按任意惯性不变量排序的固定伽罗瓦群数域的计数方法，对无穷多新群证明了无条件结果，并在子凸性假设下证明了渐近增长率的存在性。
We present a unified approach which gives completely elementary proofs of three weighted sum formulae for double zeta values. This approach also leads to new evaluations of sums relating to the harmonic numbers, the alternating double zeta values, and the Witten zeta function. We discuss a heuristic for finding or dismissing the existence of similar simple sums. We also produce some new sums from recursions involving the Riemann zeta and the Dirichlet beta functions.
Strong $q$-analogues for values of the Dirichlet beta function
受Ramanujan笔记基础情形与Riemann zeta函数平行构造启发，研究者构造无穷多模形式关系以推广Dirichlet beta函数正奇数值，证明其为强$q$-类似物并得到相关模形式傅里叶系数渐近公式。
We construct multiple Dirichlet series in several complex variables whose coefficients involve quadratic residue symbols. The series are shown to have an analytic continuation and satisfy a certain group of functional equations. These are the first examples of an infinite collection of unstable Weyl group multiple Dirichlet series in greater than two variables.
A decomposition of Weyl group multiple Dirichlet series for symmetrizable Kac-Moody root systems
研究可对称化卡-穆迪根系的扭曲外尔群多重狄利克雷级数，用钦塔-冈内尔斯方法构建\(p\)部分，给出函数分解定理，证明其对有理函数域上的级数成立，还得到仿射\(\widetilde{A}_1\)情形下的额外函数方程及显式公式。
This note deals with the relationship between the abscissas of simple, uniform and absolute convergence for the Dirichlet series $f(s) = \sum_{n=1}^\infty a_n n^{-s}$, when the coefficients $a_n$ are either multiplicative or completely multiplicative.
Residues of quadratic Weyl group multiple Dirichlet series
本文研究有限不可约根系的 Chinta-Gunnells 平均在单短根极除子处的留数，给出由正交根子系平均表示的显式公式，并推广到有理函数域与 Gauss 域上的二次 Weyl 群多重 Dirichlet 级数。
Friedberg, Hoffstein and Lieman have constructed two related multiple Dirichlet series from quadratic and higher-order $L$-functions and Gauss sums. We compute these multiple Dirichlet series explicitly in the case of the rational function field. This is done by utilizing the functional equation of the $L$-functions and the functional equation relating the two multiple Dirichlet series. We also point out a very simple correspondence between these series and their $p$-parts.
General multiple Dirichlet series from perverse sheaves
该研究推广了Diaconu与Pasol的公理，给出函数域$\boldsymbol{\rm F}_q(T)$上多重狄利克雷级数的公理化刻画，借助反常层迹函数证明满足公理的级数存在，涵盖了文献中诸多已知的多重狄利克雷级数。
Let Phi be a reduced root system of rank r. A Weyl group multiple Dirichlet series for Phi is a Dirichlet series in r complex variables s_1,...,s_r, initially converging for Re(s_i) sufficiently large, that has meromorphic continuation to C^r and satisfies functional equations under the transformations of C^r corresponding to the Weyl group of Phi. A heuristic definition of such series was given in [2], and they have been investigated in certain special cases in [2-6, 11-14]. In this paper we generalize results in [13] to construct Weyl group multiple Dirichlet series by a uniform method, and …
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