Florian Breuer, Fabien Pazuki, Mahefason Heriniaina Razafinjatovo
We provide explicit bounds on the difference of heights of isogenous Drinfeld modules. We derive a finiteness result in isogeny classes. In the rank 2 case, we also obtain an explicit upper bound on the size of the coefficients of modular polynomials attached to Drinfeld modules.
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We study modular polynomials classifying cyclic isogenies between Drinfeld modules of arbitrary rank over the ring F_q[T].
This is a sequel to the paper [F. Breuer, H.-G. Rück, Drinfeld modular polynomials in higher rank, J. Number Theory 129 (2009), 59-83.], in which we introduced Drinfeld modular polynomials of higher rank, using an analytic construction. These polynomials relate the isomorphism invariants of Drinfeld F_q[T]-modules of rank r\geq 2 linked by isogenies of a specified type. In the current paper, we give an algebraic construction of greater generality, and prove a generalization of the Kronecker congruences relations, which describe what happens when modular polynomials associated to P-isogenies ar…
Drinfeld modular polynomials of level $T$
本文研究了参数化秩 $r\geq 2$ 的 Drinfeld 模间 $T$-同源的模多项式，通过显式分类同源，导出了系数 $T$-次数的显式界限，并获得了多项式高度的精确表达式。
Let $Φ$ be a Drinfeld $\mathbf{F}_{q}[T]$-module of rank 2, over a finite field $L$, a finite extension of $n$ degrees of a finite field with $q$ elements $\mathbf{F}_{q}$. Let $m$ be the extension degrees of $ L$ over the field $\mathbf{F}_{q}[T]/P$, $P$ is the $\mathbf{F}%_{q}[T]$-characteristic of $L$, and $d$ the degree of the polynomial $P$. We will discuss about a many analogies points with elliptic curves. We start by the endomorphism ring of a Drinfeld $\mathbf{F}_{q}[T]$-module of rank 2, End$_{L}Φ$, and we specify the maximality conditions and non maximality conditions as a $\mathbf{…
We provide explicit bounds on the difference of heights of the $j$-invariants of isogenous elliptic curves defined over $\overline{\mathbb{Q}}$. The first one is reminiscent of a classical estimate for the Faltings height of isogenous abelian varieties, which is indeed used in the proof. We also use an explicit version of Silverman's inequality and isogeny estimates by Gaudron and Rémond. We give applications to the study of Vélu's formulas and of modular polynomials.
A parallelogram height inequality for Drinfeld modules
本文研究了Drinfeld模在平行四边形同态结构下的高度不等式，类比于数域和函数域上阿贝尔簇的相关结果。
Homological Methods in the Generalization of Drinfeld Modules
引入三角t-模作为Drinfeld模的自然推广，建立纯性准则与约化程序，研究态射与同源，证明可均匀化，并发展对偶理论。
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…
Heights of Drinfeld modular polynomials and Hecke images
本文研究了 Drinfeld 模多项式与 Hecke 像的高度问题，获得了多项式系数大小的显式上下界，并证明了其主项的渐近最优性，同时给出了秩2 Drinfeld 模 Hecke 像高度的精确估计。
Heights and singular moduli of Drinfeld modules
本文发展了Drinfeld模的高技术，证明了在$q>5$为奇数时，秩为2的$\mathbb{F}_q[t]$-Drinfeld模中至多仅有有限个奇异模为代数单位。
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 …
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 give a lower bound for the local height of a non-torsion element of a Drinfeld module.
We propose a lower bound estimate in Dobrowolski's style of the canonical height on a certain family of Drinfeld modules of characteristic 0, including under some hypothesis on their degree and their base field, the complex multiplication case, extending so a previous result of L. Denis on Carlitz modules. Our study is focused on the highest possible level of precision on the parameters involved with rapport to the main values which characterize the Drinfeld module (height, base field degree and rank) and it provides an estimate in function of both separable and inseparable degree of the algeb…
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.
Algorithms for computing norms and characteristic polynomials on general Drinfeld modules
本文提出两类计算任意秩 Drinfeld 模自同态特征多项式与同源范数的算法，分别基于 Anderson motives 对应的线性代数归约和 Frobenius 的中心单代数既约范数公式，并在特定底曲线下证明了其最佳渐近性能。
Explicit Zsigmondy bounds for families of Drinfeld modules of rank 2
本文针对秩为2的Drinfeld模族，通过界定局部高度并联系典范高度与经典高度，给出了其Zsigmondy集合的显式界。
Distributive properties of division points and discriminants of Drinfeld modules
该研究针对带指定位的整体函数域提出Drinfeld模的秩r分布新概念，引入三类基本分布推导分点与判别式的乘积公式，涵盖已知结果并得到典范判别式定义等新结论，还给出经典情形下的显式值。
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, …
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。
Counting Drinfeld modules with prescribed local conditions
该研究针对$\mathbb{F}_q(T)$上给定高度且满足指定局部条件的Drinfeld $\mathbb{F}_q[T]$-模数量给出渐近估计，通过关联加权射影空间点计数问题实现，其关于全局函数域上加权射影空间有界高度点计数的结果具独立意义。
On supersingular isogeny graphs of Drinfeld modules
本文研究A=𝔽_q[T]上秩2的Drinfeld模的超奇异同构图，证明其连通性，引入完备性数并推导其上、下界，证实相关猜想并反驳旧界，还给出计算该数的算法准则。
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.
Colmez conjectured a product formula for periods of abelian varieties over number fields with complex multiplication and proved it in some cases. His conjecture is equivalent to a formula for the Faltings height of CM abelian varieties in terms of the logarithmic derivatives at $s=0$ of certain Artin $L$-functions. In a series of articles we investigate the analog of Colmez's theory in the arithmetic of function fields. There abelian varieties are replaced by Drinfeld modules and their higher dimensional generalizations, so-called $A$-motives. In the present article we prove the product formul…
In the arithmetic of function fields Drinfeld modules play the role that elliptic curves take on in the arithmetic of number fields. As higher dimensional generalizations of Drinfeld modules, and as the appropriate analogues of abelian varieties, G. Anderson introduced pure t-motives. In this article we study the arithmetic of the later. We investigate which pure t-motives are semisimple, that is, isogenous to direct sums of simple ones. We give examples for pure t-motives which are not semisimple. Over finite fields the semisimplicity is equivalent to the semisimplicity of the endomorphism al…
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…
We survey Colmez's theory and conjecture about the Faltings height and a product formula for the periods of abelian varieties with complex multiplication, along with the function field analog developed by the authors. In this analog, abelian varieties are replaced by Drinfeld modules and $A$-motives. We also explain the necessary background on abelian varieties, Drinfeld modules and $A$-motives, including their cohomology theories and comparison isomorphisms and their theory of complex multiplication.
The $T$-adic Galois representation is surjective for a positive density of Drinfeld modules
本文研究秩 2 Drinfeld 模族，证明在按加权高度排序的参数对中，存在正密度的模，其附属的 $T$-进 Galois 表示为满射。
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