Dragos Ghioca
We prove an equidistribution result for torsion points of Drinfeld modules of generic characteristic. We also show that similar equidistribution statements provide proofs for the Manin-Mumford and the Bogomolov conjectures for Drinfeld modules.
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We prove that the local height of a point on a Drinfeld module can be computed by averaging the logarithm of the distance to that point over the torsion points of the module. This gives rise to a Drinfeld module analog of a weak version of Siegel's integral points theorem over number fields and to an analog of a theorem of Schinzel's regarding the order of a point modulo certain primes.
In this paper we prove a sparse equidistribution theorem for Gross points over the rational function field $\mathbb{F}_q(t)$. We apply this result to study the reduction map from CM Drinfeld modules to supersingular Drinfeld modules. Our proofs rely crucially on a period formula due to M. Papikian and F.-T. Wei/J. Yu, and a Lindelöf-type bound for central values of Rankin-Selberg $L$-functions associated to twists of automorphic forms of Drinfeld-type by ideal class group characters.
Equidistribution of Hecke Orbits on the Picard group of definite Shimura curves
本文利用自守方法及Drinfeld型尖点自守形式的系数界，证明了函数域上定志村曲线皮卡群中赫克轨道的等分布，特别是秩2超奇异Drinfeld模的赫克轨道等分布。
Averaging over imaginary quadratic fields, we prove, quantitatively, the equidistribution of CM points associated to 3-torsion classes in the class group. We conjecture that this equidistribution holds for points associated to ideals of any fixed odd order. We prove a partial equidistribution result in this direction and present empirical evidence.
Duke for Drinfeld
本文在 Drinfeld–Stuhler 模曲线背景下证明了 CM 点的 Duke 均衡分布定理的函数域类比，将 Duke 定理和 Zhang 的均衡分布推广到 Drinfeld 情形，并处理了任意水平结构和正特征。
We prove that the groups PSL(r,q^d) can be realized F_q(T)-regularly as Galois groups over the purely transcendental field F_q(T)(t_1,...,t_{r-1}) if r is even and r/2 is coprime to q^d-1. The method is to use twisted moduli schemes of Drinfeld modules (a la Shih). If one has sufficient control over modular forms, it can be made into an algorithm to find explicit equations. We do this for PSL(2,q^2) using Drinfeld modular forms.
We study rational points and torsion points on Drinfeld modular curves defined over rational function fields. As a consequence we derive a conjecture of Schweizer describing completely the torsion of Drinfeld modules of rank two over $\Bbb F_2(T)$ implying Poonen's uniform boundedness conjecture in this particular case.
We derive asymptotically optimal upper bounds on the number of L-rational torsion points on a given elliptic curve or Drinfeld module defined over a finitely generated field K, as a function of the degree [L:K]. Our main tool is the adelic openness of the image of Galois representations attached to elliptic curves and Drinfeld modules, due to Serre and Pink-Ruetsche, respectively. Our approach is to prove a general result for certain Galois modules, which applies simultaneously to elliptic curves and to Drinfeld modules.
In this paper, we formulate the Drinfeld module analogue of a question raised by Lang and studied by Katz on the existence of rational points on abelian varieties over number fields. Given a maximal ideal $\fl$ of $\F_q[T]$, the question essentially asks whether, up to isogeny, a Drinfeld module $ϕ$ over $\F_q(T)$ contains a rational $\fl$-torsion point if the reduction of $ϕ$ at almost all primes of $\F_q[T]$ contains a rational $\fl$-torsion point. Similar to the case of abelian varieties, we show that the answer is positive if the rank of the Drinfeld module is $2$, but negative if the rank…
In this short note we provide a few examples of non-isomorphic arithmetically equivalent global function fields. These examples are obtained via well-known technique of adjoining the torsion points of various Drinfeld Modules to realise the $Gl_n(\mathbb F_q)$ as a Galois group of extensions of global function fields. Furthermore we afford the code of the Magma scripts to verify the results and construct more examples in similar fashion.
It is conjectured that for fixed $A$, $r \ge 1$, and $d \ge 1$, there is a uniform bound on the size of the torsion submodule of a Drinfeld $A$-module of rank $r$ over a degree $d$ extension $L$ of the fraction field $K$ of $A$. We verify the conjecture for $r=1$, and more generally for Drinfeld modules having potential good reduction at some prime above a specified prime of $K$. Moreover, we show that within an $\Lbar$-isomorphism class, there are only finitely many Drinfeld modules up to isomorphism over $L$ which have nonzero torsion. For the case $A=\Fq[T]$, $r=1$, and $L=\Fq(T)$, we give …
To each Drinfeld module over a finitely generated field with generic characteristic, one can associate a Galois representation arising from the Galois action on its torsion points. Recent work of Pink and Rütsche has described the image of this representation up to commensurability. Their theorem is qualitative, and the objective of this paper is to complement this theory with a worked out example. In particular, we give examples of Drinfeld modules of rank 2 for which the Galois action on their torsion points is as large as possible. We will follow the approach that Serre used to give explici…
Geyer and Jarden proved several results for torsion points of elliptic curves defined over the fixed field by finitely many elements in the absolute Galois group of a finitely generated field over the prime field in its algebraic closure. As an analogue of these results, this paper studies torsion points of Drinfeld modules defined over the fixed field by finitely many elements in the absolute Galois group of a finitely generated function field in its algebraic closure. We prove some results which are similar to those of Geyer and Jarden.
Let $\frak{n}$ be a square-free ideal of $\mathbb{F}_q[T]$. We study the rational torsion subgroup of the Jacobian variety $J_0(\frak{n})$ of the Drinfeld modular curve $X_0(\frak{n})$. We prove that for any prime number $\ell$ not dividing $q(q-1)$, the $\ell$-primary part of this group coincides with that of the cuspidal divisor class group. We further determine the structure of the $\ell$-primary part of the cuspidal divisor class group for any prime $\ell$ not dividing $q-1$.
If M is a Drinfeld module over a local function field L, we may view M as a dynamical system, and consider its filled Julia set J. If J^0 is the connected component of the identity, relative to the Berkovich topology, we give a characterisation of the component module J/J^0 which is analogous to the Kodaira-Neron characterisation of the special fibre of a Neron model of an elliptic curve over a non-archimedean field. In particular, if L is the fraction field of a discrete valuation ring, then the component module is finite, and moreover trivial in the case of good reduction. In the context of …
Let $Φ^ł$ be an algebraic family of Drinfeld modules defined over a field $K$ of characteristic $p$, and let $\bfa,\bfb\in K[ł]$. Assume that neither $\bfa(ł)$ nor $\bfb(ł)$ is a torsion point for $Φ^ł$ for all $ł$. If there exist infinitely many $ł\in\Kbar$ such that both $\bfa(ł)$ and $\bfb(ł)$ are torsion points for $Φ^ł$, then we show that for each $ł\in\Kbar$, we have that $\bfa(ł)$ is torsion for $Φ^ł$ if and only if $\bfb(ł)$ is torsion for $Φ^ł$. In the case $\bfa,\bfb\in K$, then we prove in addition that $\bfa$ and $\bfb$ must be $\Fpbar$-linearly dependent.
We generalize our work on Carlitz prime power torsion extension to torsion extensions of Drinfeld modules of arbitrary rank. As in the Carlitz case, we give a description of these extensions in terms of evaluations of Anderson generating functions and their hyperderivatives at roots of unity. We also give a direct proof that the image of the Galois representation attached to the $\mathfrak{p}$-adic Tate module lies in the $\mathfrak{p}$-adic points of the motivic Galois group. This is a generalization of the corresponding result of Chang and Papanikolas for the $t$-adic case.
We study the $v$-adic distance from the torsion of a Drinfeld module to an affine variety.
A connected Kuga-Sato variety $\mathbf{W}^r$ parameterizes tuples of $r$ points on elliptic curves (with level structure). A special point of $\mathbf{W}^r$ is a tuple of torsion points on a CM elliptic curve. A sequence of special points is strict if any CM elliptic curve appears at most finitely many times and no relation between the points in the tuple is satisfied infinitely often. The genus orbit of a special point is the $\operatorname{Gal}(\bar{\mathbb{Q}}/\mathbb{Q}^{\mathrm{ab}})$-orbit. We show that genus orbits of special points in a strict sequence equidistribute in $\mathbf{W}^r(\…
We give a lower bound for the local height of a non-torsion element of a Drinfeld module.
Let $q$ be a power of the prime number $p$, let $K={\mathbb F}_q(t)$, and let $r\ge 2$ be an integer. For points ${\mathbf a}, {\mathbf b}\in K$ which are $\mathbb{F}_q$-linearly independent, we show that there exist positive constants $N_0$ and $c_0$ such that for each integer $\ell\ge N_0$ and for each generator $τ$ of ${\mathbb F}_{q^\ell}/{\mathbb F}_q$, we have that for all except $N_0$ values $λ\in{\overline{\mathbb{F}_q}}$, the corresponding specializations ${\mathbf a}, {\mathbf b}(τ)$ and ${\mathbf b}(τ)$ cannot have orders of degrees less than $c_0\log\log\ell$ as torsion points for …
Equidistribution of CM points on Shimura Curves and ternary theta series
本文证明全实域上志村曲线特殊纤维上CM点Galois轨道约化的等分布（含分裂和分歧情形，分歧情形用Cerednik-Drinfeld一致化模解释），通过关联权3/2希尔伯特模形式及分析傅里叶系数实现，并推导出André-Oort猜想积分版本的志村曲线情形。
Let $F$ be a local non-Archimedean field with ring of integers $o$. Let $\bf X$ be a one-dimensional formal $o$-module of $F$-height $n$ over the algebraic closure of the residue field of $o$. By the work of Drinfeld, the universal deformation $X$ of $\bf X$ is a formal group over a power series ring $R_0$ in $n-1$ variables over the completion of the maximal unramified extension of $o$. For $h \in \{0,...,n-1\}$ let $U_h$ be the subscheme of $\Spec(R_0)$ where the connected part of the associated divisible module of $X$ has height $h$. Using the theory of Drinfeld level structures we show tha…
The norm residue symbol for formal Drinfeld modules
研究具有稳定约化高度为一的形式 Drinfeld 模的库默尔配对，通过形式 Drinfeld 模的对数等元素给出明确描述，推广了相关结果并扩展了公式。
Rational torsion of generalised Drinfeld modular Jacobians of prime power level
本文研究素数幂水平 Drinfeld 模曲线的广义雅可比簇的挠群，证明其 $\ell$-primary 部分在 $\ell$ 不整除 $q(q^2-1)$ 时平凡，建立了 Yamazaki--Yang 结果的函数域类比。
Equidistribution in Families of Abelian Varieties and Uniformity
本文利用 Arakelov 理论等分布技术推导出 Manin-Mumford 和 Bogomolov 猜想的一致性结果，并证明代数曲线上挠点和有理点数量可仅由亏格与 Mordell-Weil 秩一致界定。
We consider the generalized Jacobian $\widetilde{J}$ of the modular curve $X_0(N)$ of level $N$ with respect to a reduced divisor consisting of all cusps. Supposing $N$ is square free, we explicitly determine the structure of the $\mathbb{Q}$-rational torsion points on $\widetilde{J}$ up to $6$-primary torsion. The result turns out to be very different from the case of prime power level previously studied by Yang and the second author. We also obtain an analogous result for Drinfeld modular curves. Our proof relies on similar results for classical Jacobians due to Ohta, Papikian and the first …
Integral torsion points on abelian varieties over function fields
本文在全局函数域上证明了关于阿贝尔变种上 torsion 点非 Zariski 密度的猜想，并建立了相关的 Tate-Voloch 类型定理，从而得到 Galois 轨道 torsion 点的对数等分布结果。
Let ϕ be a Drinfeld A-module of characteristic p0 over a finitely generated field K. Previous articles determined the image of the absolute Galois group of K up to commensurability in its action on all prime-to-p0 torsion points of ϕ, or equivalently, on the prime-to-p0 adelic Tate module of ϕ. In this article we consider in addition a finitely generated torsion free A-submodule M of K for the action of A through ϕ. We determine the image of the absolute Galois group of K up to commensurability in its action on the prime-to-p0 division hull of M, or equivalently, on the extended prime-to-p0 ad…
Torsion cycles on Fermat varieties
本文通过埃尔利克的方法重新证明了罗赫利奇关于费马曲线的定理，并将其推广到更高维度的无同源循环和高智周期。
In this paper we generalize the results of \cite{sanchez} to rank one Drinfeld modules with class number one. We show that, in the present form, there does not exist a cogalois theory for Drinfeld modules of rank or class number larger than one. We also consider the torsion of the Carlitz module for the extension ${\mathbb{F}}_{q}(T)(Λ_{P^{n}}) /{\mathbb{F}}_{q}(T)(Λ_{P})$.
A geometric approach to the uniform boundedness of $\ell$-primary torsion points
本文通过几何方法证明了阿贝尔方案上ℓ-原 torsion 点的统一有界性，并解决了Cadoret和Tamagawa的猜想。
$p$-adic equidistribution and an application to $S$-units
本研究在$p$-进框架下证明了$\mathbb G_m^n$中挠点的伽罗瓦等分布结果，给出衰减速率的幂节省定量估计，并应用该结果证明Ih猜想对一类$\mathbb G_m^n$除子成立。
Galois orbits of torsion points near atoral sets
本文将代数环面上挠点的伽罗瓦均匀分布推广到奇异检验函数，得到带幂节省的定量衰减估计，并据此证明了一类非环面除子的 Ih 整性有限性猜想。
Computing submodules of points of general Drinfeld modules over finite fields
本文提出了一种计算一般Drinfeld模在有限域上点子模结构的算法，并探讨了其复杂性及实现方法。
We prove that in the backward orbit of a non-preperiodic point under the action of a Drinfeld module of generic characteristic there exist at most finitely many points S-integral with respect to another nonpreperiodic point. This provides the answer (in positive characteristic) to a question raised by Sookdeo. We also prove that for each nontorsion point z, there exist at most finitely many torsion points which are S-integral with respect to z. This proves a question raised by Tucker and the author, and it gives the analogue of Ih's conjecture for Drinfeld modules.
In the arithmetic of function fields, Drinfeld modules play the role that elliptic curves play in the arithmetic of number fields. The aim of this paper is to study a non-existence problem of Drinfeld modules with constrains on torsion points at places with large degree. This is motivated by a conjecture of Christopher Rasmussen and Akio Tamagawa on the non-existence of abelian varieties over number fields with some arithmetic constraints. We prove the non-existence of Drinfeld modules satisfying Rasmussen-Tamagawa type conditions in the case where the inseparable degree of base fields is not …
In this paper, we prove explicit reciprocity laws for a class of formal Drinfeld modules having stable reduction of height one, in the spirit of those existing in characteristic zero (cf. the work of Wiles). We begin by defining the Kummer pairing in the language of formal Drinfeld modules defined over local fields of positive characteristic. We then prove explicit formulas for this pairing in terms of the logarithm of the formal Drinfeld module, a certain Coleman power series, torsion points and the trace. Our results extend the explicit formulas already proved by Anglès for Carlitz modules, …
Galois orbits of torsion points over polytopes near atoral sets
该研究推广了扭点 Galois 轨道上的等分布定理至多胞体子集，给出收敛速度估计，并应用于二维高度收敛问题，附有计算严格度幂的算法。
As a generalization of Drinfeld modules, Greg Anderson introduced abelian t-modules and t-motives over a perfect field. In this article we study relative versions of these over rings. We investigate isogenies among them. Our main results state that every isogeny possesses a dual isogeny in the opposite direction, and that a morphism between abelian t-modules is an isogeny if and only if the corresponding morphism between their associated t-motives is an isogeny. We also study torsion submodules of abelian t-modules which in general are non-reduced group schemes. They can be obtained from the a…
Lower Bound for the Canonical Height for Drinfeld Modules with Complex Multiplication. Let K be a fi nite extension of Fq(T), let L=K be a Galois extension with Galois group G and let E be the sub eld of L fixed by the center of G. Assume that there exists a finite place v of K such that the local degrees of E=K above v are bounded. Let $ϕ$ be a Drinfeld module with complex multiplication. We give an e fective lower bound for the canonical height of $ϕ$ on L outside the torsion points of $ϕ$ . In the number field case, this problem was solved by F. Amoroso, S. David and U. Zannier.
Bornes de torsion et un théorème effectif du pgcd
本文证明了 Deligne 的“最大公约数定理”的一个有效概率版本，适用于有限域上的光滑射影几何整簇，其核心方法是通过界定 Betti 上同调的挠率、利用大单值性结果及 Frobenius 均匀分布来实现。
Rank metric codes from Drinfeld modules
本文通过Drinfeld模与秩度量码的联系，构建了基于线性子空间的秩度量码，并给出了新的半字段码构造方法。
Let $A$ be the coordinate ring of a projective smooth curve over a finite field minus a closed point. For a nontrivial ideal $I \subset A$, Drinfeld defined the notion of structure of level $I$ on a Drinfeld module. We extend this to that of level $N$, where $N$ is a finitely generated torsion $A$-module. The case where $N=(I^{-1}/A)^d$, where $d$ is the rank of the Drinfeld module,coincides with the structure of level $I$. The moduli functor is representable by a regular affine scheme. The automorphism group $\mathrm{Aut}_{A}(N)$ acts on the moduli space. Our theorem gives a class of subgroup…
Iwasawa theory of fine Selmer groups associated to Drinfeld modules
本文在常数 $\mathbb{Z}_p$-扩张上引入与 Drinfeld 模的 $\mathfrak{p}$-准原挠率相关的精细 Selmer 群，证明其为余有限生成模，从而确立了 Iwasawa $μ=0$ 猜想的类比。
Denis associated to each Drinfeld module M over a global function function field L a canonical height function, which plays a role analogous to that of the Neron-Tate height in the context of elliptic curves. We prove that there exist constants ε>0 and C, depending only on the number of places at which M has bad reduction, such that either x in M is a torsion point of bounded order, or else the canonical height of x is bound below by εmax{h(j_M), deg(D_M)}, where j_M is a certain invariant of the isomorphism class of M, and D_M is the minimal discriminant of M. As an application, we make some …
Skew cyclic codes through Drinfeld modules
本文利用超奇异 Drinfeld 模的挠元构造秩度量下的斜循环码，证明码与子模的格反同构及秩-BCH 界，设计距离等于真实距离。
Torsion of rank-two $A$-motives values in odd characteristic cyclotomic towers
本文针对奇特征局部域上的秩二 $A$-motive 和全局函数域上的秩二 Drinfeld $A$-模，分别给出了 Imai 定理和 Ribet 定理的类似结论，证明了挠点取值的有限性。
Let F be a finite field and let b and N be integers. We prove explicit estimates for the probability that the number of rational points on a randomly chosen elliptic curve E over F equals b modulo N. The underlying tool is an equidistribution result on the action of Frobenius on the N-torsion subgroup of E. Our results subsume and extend previous work by Achter and Gekeler.
We give a dynamical proof of a result of Masser and Zannier [MZ2, MZ3] about torsion points on the Legendre family of elliptic curves. Our methods also treat points of small height. A key ingredient is the arithmetic equidistribution theorem on $\mathbb{P}^1$ of Baker-Rumely, Chambert-Loir, and Favre-Rivera-Letelier. Torsion points on the elliptic curve coincide with preperiodic points for the degree-4 Lattes family of rational functions. Our main new results concern properties of the bifurcation measures for this Lattes family associated to marked points.
Galois representation of the product of two Drinfeld modules of generic characteristic
本文研究了Drinfeld模乘积的Galois表示，证明了对于任意有限素数集，对应乘积表示的像足够大，即与由自然行列条件定义的子群可公约。方法结合了Pink的局部域上线性群紧子群最小模型理论和全局函数域的显式互反律。
The Rational Torsion Subgroup of $J_0(\mathfrak{p}^r)$
本文研究函数域上 Drinfeld 模雅可比簇 $J_0(\mathfrak{p}^r)$ 的有理挠子群，证明其 prime-to-$q(q-1)$ 部分与有理尖点除子类群相同，并借助后者结构的完整计算确定了前者的结构。
We prove that all points of a toroidal compactification lying over 0-dimensional cusps are rationally equivalent in the integral Chow group for most classical modular varieties (Siegel, Hilbert, orthogonal, Hermitian, quaternionic). This gives a generalization, and even strengthening, of the Manin-Drinfeld theorem in higher dimension from the viewpoint of algebraic cycles. The same result no longer holds for Picard modular varieties, but for them we prove that the difference of any two "special" boundary points, which are dense in the boundary, is torsion.
Anderson generating function of rank-one Drinfeld Module over rational function fields
本文研究了一阶Drinfeld模在有理函数域上的安德森生成函数，通过构造生成函数并将其与Carlitz周期关联，解决了无限地方度数大于1的理论空白，提出新的方法论进展。
The $μ-$invariant of fine Selmer groups associated to general Drinfeld modules
本文证明在整体函数域的常值 Z_p-扩张上，任意 Drinfeld 模的 p-准素挠精细 Selmer 群的 Pontryagin 对偶是有限生成 Iwasawa 模且 μ-不变量为零，推广了已有结果。
A General Construction of Codes from Drinfeld Modules
该研究从Drinfeld模出发，通过限制有界次数态射到互素挠点构造出超奇异情形下的秩与和秩码，得到显式MSRD族及多项式时间解码器，还推导了对应滤波方程。
Drinfeld modules with maximal Galois action
本文研究了秩2 Drinfeld 模扭点上的 Galois 表示，证明了对于随机选取的参数，该表示的像极大，并在正密度参数集合上达到满射。
The Relative Manin-Mumford Conjecture
本文在特征0下证明阿贝尔簇族的相对马宁-芒福德猜想，采用皮拉-赞尼尔方法，结合新的高度不等式与退化轨迹研究，还强化结果给出复数域上阿贝尔概法子簇挠点稠密判据，并给出一致马宁-芒福德猜想的无等分布新证明。
Relation between Anderson Generating Functions and Weil Pairing
本文通过Moore行列式与Anderson生成函数的余数多项式，给出了Drinfeld模的Weil配对值的简洁解释。
Consider the smooth projective models C of curves y^2=f(x) with f(x) in Z[x] monic and separable of degree 2g+1. We prove that for g >= 3, a positive fraction of these have only one rational point, the point at infinity. We prove a lower bound on this fraction that tends to 1 as g tends to infinity. Finally, we show that C(Q) can be algorithmically computed for such a fraction of the curves. The method can be summarized as follows: using p-adic analysis and an idea of McCallum, we develop a reformulation of Chabauty's method that shows that certain computable conditions imply #C(Q)=1; on the o…
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