Elliptic K3 surfaces with geometric Mordell-Weil rank 15

Hodge theory and the Mordell-Weil rank of elliptic curves over extensions of function fields

We use Hodge theory to prove a new upper bound on the ranks of Mordell-Weil groups for elliptic curves over function fields after regular geometrically Galois extensions of the base field, improving on previous results of Silverman and Ellenberg, when the base field has characteristic zero and the supports of the conductor of the elliptic curve and of the ramification divisor of the extension are disjoint.

Mordell-Weil lattices in characteristic 2, III: A Mordell-Weil lattice of rank 128

In the first paper of this series, we constructed a family of lattices in dimensions 2^{n+1} for positive integers n, and proved that the associated lattice packings of spheres equal or exceed the previous records for several values of n. In this paper we analyze the case n=6, which is now the first case where the resulting lattice MW128 yields a previously unknown lattice of record density. We prove that the elliptic curve used to construct this lattice has trivial Tate-Shafarevich group, and exhibit on that curve a rational point whose canonical height attains our lower bound on the minimal …

Specialization of Mordell-Weil ranks of abelian schemes over surfaces to curves

Using the Shioda-Tate theorem and an adaptation of Silverman's specialization theorem, we reduce the specialization of Mordell-Weil ranks for abelian varieties over fields finitely generated over infinite finitely generated fields $k$ to the the specialization theorem for Néron-Severi ranks recently proved by Ambrosi in positive characteristic. More precisely, we prove that after a blow-up of the base surface $S$, for all vertical curves $S_x$ of a fibration $S \to U \subseteq \mathbf{P}^1_k$ with $x$ from the complement of a sparse subset of $|U|$, the Mordell-Weil rank of an abelian scheme o…

Distribution of Mordell--Weil ranks of families of elliptic curves

We discuss the distribution of Mordell--Weil ranks of the family of elliptic curves $y^2=(x+αf^2)(x+βb g^2)(x+γh^2)$ where $f,g,h$ are coprime polynomials that parametrize the projective smooth conic $a^2+b^2=c^2$ and $α,β,γ$ are elements from $\overline{\mathbb{Q}}$. In our previous papers we discussed certain special cases of this problem and in this article we complete the picture by proving the general results.

Decomposability and Mordell-Weil ranks of Jacobians using Picard numbers

We use methods for computing Picard numbers of reductions of K3 surfaces in order to study the decomposability of Jacobians over number fields and the variance of Mordell-Weil ranks of families of Jacobians over different ground fields. For example, we give examples of surfaces whose Picard numbers jump in rank at all primes of good reduction using Mordell-Weil groups of Jacobians and show that the genus of curves over number fields whose Jacobians are isomorphic to a product of elliptic curves satisfying certain reduction conditions is bounded. The isomorphism result addresses the number fiel…

On Mordell-Weil groups of Jacobians over function fields

We study the arithmetic of abelian varieties over $K=k(t)$ where $k$ is an arbitrary field. The main result relates Mordell-Weil groups of certain Jacobians over $K$ to homomorphisms of other Jacobians over $k$. Our methods also yield completely explicit points on elliptic curves with unbounded rank over $\Fpbar(t)$ and a new construction of elliptic curves with moderately high rank over $\C(t)$.

Point générique et saut du rang du groupe de Mordell-Weil

Let $k$ be a number field and $U$ a smooth integral $k$-variety. Let $X \to U$ be an abelian scheme. We consider the set $\mathcal{R}$ of rational points $m \in U(k)$ such that the Mordell-Weil rank of the fibre $U_{m}$ is strictly bigger than the Mordell-Weil rank of the generic fibre. We prove the following results. If the $k$-variety $X$ is $k$-unirational, then $\mathcal{R}$ is dense for the Zariski topology on $U$. If $X$ is $k$-rational, then $\mathcal{R}$ is not thin in $U$. This generalizes results of Billard and of Salgado. The main idea goes back to Néron's thesis: use the generic po…

Mordell-Weil ranks of families of elliptic curves associated to Pythagorean triples

We study the family of elliptic curves $y^2=x(x-a^2)(x-b^2)$ parametrized by Pythagorean triples $(a,b,c)$. We prove that for a generic triple the lower bound of the rank of the Mordell-Weil group over $\mathbb{Q}$ is 1, and for some explicitly given infinite family the rank is 2. To each family we attach an elliptic surface fibered over the projective line. We show that the lower bounds for the rank are optimal, in the sense that for each generic fiber of such an elliptic surface its corresponding Mordell-Weil group over the function field $\mathbb{Q}(t)$ has rank 1 or 2, respectively. In ord…

Elliptic K3 surfaces associated with the product of two elliptic curves: Mordell-Weil lattices and their fields of definition

To a pair of elliptic curves, one can naturally attach two K3 surfaces: the Kummer surface of their product and a double cover of it, called the Inose surface. They have prominently featured in many interesting constructions in algebraic geometry and number theory. There are several more associated elliptic K3 surfaces, obtained through base change of the Inose surface; these have been previously studied by Kuwata. We give an explicit description of the geometric Mordell-Weil groups of each of these elliptic surfaces in the generic case (when the elliptic curves are non-isogenous). In the non-…

圆锥丛与椭圆曲面的Mordell--Weil秩

Conic bundles and Mordell--Weil ranks of elliptic surfaces

本文通过探索定义在函数域上的椭圆曲线的圆锥丛结构，获得了其Mordell--Weil秩的上下界。

Mordell-Weil groups of a hyperkähler manifold - a question of F. Campana

Mordell-Weil groups of different abelian fibrations of a hyperkähler manifold may have non-trivial relation even among elements of infinite order, but have essentially no relation, as its birational transformation. Precise definition of the terms "essentially no relation" will be given in Introduction.

On ring class eigenspaces of Mordell-Weil groups of elliptic curves over global function fields

If E is a non-isotrivial elliptic curve over a global function field F of odd characteristic we show that certain Mordell-Weil groups of E have 1-dimensional eigenspace relative to a fixed complex ring class character provided that the projection onto this eigenspace of a suitable Drinfeld-Heegner point is nonzero. This represents the analogue in the function field setting of a theorem for rational elliptic curves due to Bertolini and Darmon, and at the same time is a generalization of the main result proved by Brown in his monograph on Heegner modules. As in the number field case, our proof e…

A Mordell-Weil theorem for cubic hypersurfaces of high dimension

Let $X$ be a smooth cubic hypersurface of dimension $n \ge 1$ over the rationals. It is well-known that new rational points may be obtained from old ones by secant and tangent constructions. In view of the Mordell--Weil theorem for $n=1$, Manin (1968) asked if there exists a finite set $S$ from which all other rational points can be thus obtained. We give an affirmative answer for $n \ge 48$, showing in fact that we can take the generating set $S$ to consist of just one point. Our proof makes use of a weak approximation theorem due to Skinner, a theorem of Browning, Dietmann and Heath-Brown on…

Mordell-Weil lattice of Inose's Elliptic $K3$ surface arising from the product of 3-isogenous elliptic curves

From the product of two elliptic curves, Shioda and Inose constructed an elliptic $K3$ surface having two $\mathrm{II}^*$ fibers. Its Mordell-Weil lattice structure depends on the morphisms between the two elliptic curves. In this paper, we give a method of writing down generators of the Mordell-Weil lattice of such elliptic surfaces when two elliptic curves are $3$-isogenous. In particular, we obtain a basis of the Mordell-Weil lattice for the singular $K3$ surfaces $X_{[3,3,3]}$, $X_{[3,2,3]}$ and $X_{[3,0,3]}$.

三次束的Mordell-Weil群

The Mordell Weil Groups of Cubic Pencils

该研究聚焦三次束基点对Mordell-Weil群的影响，完成了一般位置下含6至8个基点的三次束的探究与分类，并给出了相关应用。

On Mordell-Weil group of isotrivial abelian varieties over function fields

We show that the Mordell Weil rank of an isotrivial abelian variety with a cyclic holonomy depends only on the fundamental group of the complement to the discriminant provided the discriminant has singularities in the introduced here CM class. This class of singularities includes all unibranched plane curves singularities. As a corollary we give a family of simple Jacobians over field of rational functions in two variable for which the Mordell Weil rank is arbitrary large.

确定亏格 2 且 Mordell–Weil 秩为 1 的曲线上的有理点

Determining the rational points on a curve of genus 2 and Mordell-Weil rank 1

本文给出在 Mordell–Weil 秩为 1 时，利用 Jacobi 簇上有限指数生成点高效计算亏格 2 曲线全部有理点的方法。

Descent on elliptic surfaces and arithmetic bounds for the Mordell-Weil rank

We introduce the use of $p$-descent techniques for elliptic surfaces over a perfect field of characteristic not $2$ or $3$. Under mild hypotheses, we obtain an upper bound for the rank of a non-constant elliptic surface. When $p=2$, this bound is an arithmetic refinement of a well-known geometric bound for the rank deduced from Igusa's inequality. This answers a question raised by Ulmer. We give some applications to rank bounds for elliptic surfaces over the rational numbers.

On the number of Mordell-Weil generators for cubic surfaces

Let S be a smooth cubic surface over a field K. It is well-known that new K-rational points may be obtained from old ones by secant and tangent constructions. A Mordell-Weil generating set is a subset B of S(K) of minimal cardinality which generates S(K) via successive secant and tangent constructions. Let r(S,K) be the cardinality of such a Mordell-Weil generating set. Manin posed what is known as the Mordell-Weil problem for cubic surfaces: if K is finitely generated over its prime subfield then r(S,K) is finite. In this paper, we prove a special case of this conjecture. Namely, if S contain…

Mordell-Weil lattices and toric decompositions of plane curves

We extend results of Cogolludo-Agustin and Libgober relating the Alexander polynomial of a plane curve $C$ with the Mordell--Weil rank of certain isotrivial families of jacobians over $\mathbf{P}^2$ of discriminant $C$. In the second part we introduce a height pairing on the $(2,3,6)$ quasi-toric decompositions of a plane curve. We use this pairing and the results in the first part of the paper to construct a pair of degree 12 curves with 30 cusps and Alexander polynomial $t^2-t+1$, but with distinct height pairing. We use the height pairing to show that these curves from a Zariski pair.

Specializations of elliptic surfaces, and divisibility in the Mordell-Weil group

Let $E$ be an elliptic surface over the curve $C$, defined over a number field $k$, let $P$ be a section of $E$, and let $\ell$ be a rational prime. For any non-singular fibre $E_t$, we bound the number of points $Q$ on $E_t$ of (algebraic) degree at most $D$ over $k$, such that $\ell^n Q=P_t$, for some $n\geq 1$. The bound obtained depends only on $\ell$, the surface and section in question, $D$, and the degree $[k(t):k]$; that is, it is uniform across all fibres of bounded degree. In special cases, we obtain more specific, in some instances sharp, bounds.

椭圆K3曲面的Mordell-Weil群与自同构群

Mordell-Weil groups and automorphism groups of elliptic K3 surfaces

本文提出计算椭圆K3曲面Mordell-Weil群在数值Néron-Severi格上作用的方法，并据此给出与6尖点环面型六次曲线分支双平面双有理等价的K3曲面自同构群的有限生成集。

Splitting curves on a rational ruled surface, the Mordell-Weil groups of hyperelliptic fibrations and Zariski pairs

Let $Σ$ be a smooth projective surface, let $f' : S' \to Σ$ be a double cover of $Σ$ and let $μ: S \to S'$ be the canonical resolution. Put $f = f'\circμ$. An irreducible curve $C$ on $Σ$ is said to be a splitting curve with respect to $f$ if $f^*C$ is of the form $C^+ + C^- + E$, where $C^- = σ_f^*C^+$, $σ_f$ being the covering transformation of $f$ and all irreducible components of $E$ are contained in the exceptional set of $μ$. In this article, we show that a kind of "reciprocity" of splitting curves holds for a certain pair of curves on rational ruled surfaces. As an application, we consi…

源于同源椭圆曲线的Inose曲面的Mordell-Weil格

The Mordell-Weil lattice of an Inose surface arising from isogenous elliptic curves

该研究针对Inose曲面（含两条$II^{*}$纤维的椭圆K3曲面），提出寻找对应一般次数椭圆曲线同源的有理截面的方法，并给出5次、6次同源生成的Inose曲面的Mordell-Weil格基实例。

显式确定某些有理椭圆曲面的Mordell-Weil群

Determining explicitly the Mordell-Weil group of certain rational elliptic surfaces

针对特定形式的有理椭圆曲线，本研究采用几何方法，为Desjardins与Naskrecki提出的确定其Mordell-Weil秩的算法给出了更简短的正确性证明，并探讨了该几何方法的适用范围。

曲线上 $\mathbf{P}^n$-丛中超曲面的 Chevalley-Weil 公式与函数域塔中的 Mordell-Weil 秩

Chevalley-Weil formula for hypersurfaces in $\mathbf{P}^n$-bundles over curves and Mordell-Weil ranks in function field towers

本文研究曲线上射影丛中超曲面在 Galois 基变换下的 Hodge 上同调群结构，给出 Chevalley-Weil 型公式，并借此几何证明椭圆曲面 Mordell-Weil 秩的 Pal 上界，同时比较其与 Shioda-Tate 公式界的强弱关系。

Inose's construction and elliptic K3 surfaces with Mordell-Weil rank 15 revisited

We describe two constructions of elliptic K3 surfaces starting from the Kummer surface of the Jacobian of a genus 2 curve. These parallel the base-change constructions of Kuwata for the Kummer surface of a product of two elliptic curves. One of these also involves the analogue of an Inose fibration. We use these methods to provide explicit examples of elliptic K3 surfaces over the rationals of geometric Mordell-Weil rank 15.

Composition of points and Mordell-Weil problem for cubic surfaces

Let $V$ be a plane smooth cubic curve over a finitely generated field $k.$ The Mordell-Weil theorem for $V$ states that there is a finite subset $P\subset V(k)$ such that the whole $V(k)$ can be obtained from $P$ by drawing secants and tangents through pairs of previously constructed points and consecutively adding their new intersection points with $V.$ Equivalently, the group of birational transformations of $V$ generated by reflections with respect to $k$-points is finitely generated. In this paper, elaborating an idea from [M3], we establish a Mordell-Weil type finite generation result for…

特征3中拟椭圆曲面的Mordell--Weil群

Mordell--Weil groups of quasi-elliptic surfaces in characteristic 3

本文在特征3下建立了拟椭圆曲面整体截面的挠秩与超椭圆曲线p-秩的联系，并据此确定了一类拟椭圆曲面Mordell--Weil群的挠秩。

The matroid structure of vectors of the Mordell-Weil lattice and the topology of plane quartics and bitangent lines

In this paper, we introduce the terminology of matroids into the study of Zariski-pairs related to rational elliptic surfaces, aiming to simplify the presentation and arguments involved. As an application, we provide new examples of Zariski $N$-ples of relatively low degree. Namely we show that a Zariski 102-ple of degree 18 exists.

Mordell-Weil problem for cubic surfaces

Drawing the secant through two rational points of a cubic surface we can get the third one. Is the set of rational points finitely generated? We discuss some numerical data and prove a finite generation statement with respect to a modified composition law.

Uniform bounds for the number of rational points on hyperelliptic curves of small Mordell-Weil rank

We show that there is a bound depending only on g and [K:Q] for the number of K-rational points on a hyperelliptic curve C of genus g over a number field K such that the Mordell-Weil rank r of its Jacobian is at most g-3. If K = Q, an explicit bound is 8 r g + 33 (g - 1) + 1. The proof is based on Chabauty's method; the new ingredient is an estimate for the number of zeros of a logarithm in a p-adic `annulus' on the curve, which generalizes the standard bound on disks. The key observation is that for a p-adic field k, the set of k-points on C can be covered by a collection of disks and annuli …

Mordell-Weil Problem for Cubic Surfaces, Numerical Evidence

Let V be a plane smooth cubic curve over a finitely generated field k. The Mordell-Weil theorem for V states that there is a finite subset P \subset V(k) such that the whole V(k) can be obtained from P by drawing secants and tangents through pairs of previously constructed points and consecutively adding their new intersection points with V. In this paper we present numerical data regarding the analogous statement for cubic surfaces. For the surfaces examined, we also test Manin's conjecture relating the asymptotics of rational points of bounded height on a Fano variety with the rank of the Pi…

Hashing to elliptic curves of $j=0$ and Mordell--Weil groups

Consider an ordinary elliptic curve $E_b\!: y^2 = x^3 - b$ (of $j$-invariant $0$) over a finite field $\mathbb{F}_{\!q}$ such that $\sqrt[3]{b} \notin \mathbb{F}_{\!q}$. This article tries to resolve the problem of constructing a rational $\mathbb{F}_{\!q}$-curve on the Kummer surface of the direct product $E_b \!\times\! E_b^\prime$, where $E_b^\prime$ is the quadratic $\mathbb{F}_{\!q}$-twist of $E_b$. More precisely, we propose to search such a curve among infinite order $\mathbb{F}_{\!q}$-sections of some elliptic surface of $j=0$, analyzing its Mordell--Weil group. Unfortunately, we prove…

椭圆纤维的Mordell-Weil秩的界

Bounds on the Mordell-Weil rank of elliptic fibrations

本文通过两种证明方法，给出了某些椭圆纤维Mordell-Weil群秩的界，应用于Calabi-Yau簇，并提出高维情况的猜想。

Three lectures on elliptic surfaces and curves of high rank

Over the past two years we have improved several of the (Mordell-Weil) rank records for elliptic curves over Q and nonconstant elliptic curves over Q(t). For example, we found the first example of a curve E/Q with 28 independent points P_i in E(Q) (the previous record was 24, by R.Martin and W.McMillen 2000), and the first example of a curve over Q with Mordell-Weil group isomorphic with (Z/2Z) x Z^18 (the previous rank record for a curve with a 2-torsion point was 15, by Dujella 2002). In these lectures we give some of the background, theory, and computational tools that led to these new reco…

Periodic points on Veech surfaces and the Mordell-Weil group over a Teichmueller curve

Periodic points are points on Veech surfaces, whose orbit under the group of affine diffeomorphisms is finite. We characterise those points as being torsion points if the Veech surfaces is suitably mapped to its Jacobian or an appropriate factor thereof. For a primitive Veech surface in genus two we show that the only periodic points are the Weierstrass points and the singularities. Our main tool is the Hodge-theoretic characterisation of Teichmueller curves. We deduce from it a finiteness result for the Mordell-Weil group of the family of Jacobians over a Teichmueller curve.

Mordell-Weil群与Zariski三元组

Mordell-Weil groups and Zariski triples

本文构造了三条12次不可约曲线，它们尖点数相同但Alexander多项式不同，从而给出Zariski三元组的新例子，并进一步研究了相关椭圆三维流形的Mordell-Weil群生成元及一般基变换下等奇异变形空间的维数。

椭圆纤维化4流形的光滑窄Mordell-Weil群

The Smooth Narrow Mordell-Weil Group of Elliptically Fibered 4-Manifolds

本文推广Farb与Looijenga的工作，定义椭圆纤维化4流形的光滑窄Mordell-Weil群，构造其与H²(M)平凡格正交补的同构，给出其秩的显式公式并证明有理椭圆曲面是两类Mordell-Weil群秩相同的唯一椭圆曲面。

Uniform bounds for the number of rational points on curves of small Mordell--Weil rank

Let $X$ be a curve of genus $g\geq 2$ over a number field $F$ of degree $d = [F:Q]$. The conjectural existence of a uniform bound $N(g,d)$ on the number $\#X(F)$ of $F$-rational points of $X$ is an outstanding open problem in arithmetic geometry, known by [CHM97] to follow from the Bombieri--Lang conjecture. A related conjecture posits the existence of a uniform bound $N_{{\rm tors},\dagger}(g,d)$ on the number of geometric torsion points of the Jacobian $J$ of $X$ which lie on the image of $X$ under an Abel--Jacobi map. For fixed $X$ this quantity was conjectured to be finite by Manin--Mumfor…

一个Mordell-Weil秩为十二的椭圆Calabi-Yau三维流形

An elliptic Calabi-Yau threefold of Mordell-Weil rank twelve

本文构造了一个Mordell-Weil秩为十二的平坦椭圆纤维化Calabi-Yau三维流形，其Hodge数为(25,1)，通过Kummer曲面出发并给出十二个独立截面及crepant解消。

Mordell-Weil Groups of Linear Systems and the Hitchin Fibration

In this paper, we study rational sections of the relative Picard scheme of a linear system on a smooth projective variety. We prove that if the linear system is basepoint-free and the locus of non-integral divisors has codimension at least two, then all rational sections of the relative Picard scheme come from restrictions of line bundles on the variety. As a consequence, we describe the group of sections of the Hitchin fibration for moduli spaces of Higgs bundles on curves.

光滑Mordell-Weil群与椭圆曲面的映射类群

The smooth Mordell-Weil group and mapping class groups of elliptic surfaces

该研究受数论Néron-Lang定理启发，证明椭圆纤维化的光滑Mordell-Weil群有限生成，显式计算一类单连通复曲面的对应群，证明其纤维化结构拓扑同痕唯一，结合Donaldson结果得到高亏格曲面微分同胚的同痕性质。

Detecting linear dependence by reduction maps

We consider the local to global principle for detecting linear dependence of points in groups of the Mordell-Weil type. As applications of our general setting we obtain corresponding statements for Mordell-Weil groups of non{-}CM elliptic curves and some higher dimensional abelian varieties defined over number fields, and also for odd dimensional K-groups of number fields.

椭圆三维簇的 Mordell-Weil 秩与奇异超曲面上同调的计算

Calculating the Mordell-Weil rank of elliptic threefolds and the cohomology of singular hypersurfaces

本文提出计算二元有理函数域上一般椭圆曲线秩的新方法，将其转化为加权射影4-空间中奇异超曲面的上同调计算，并推广了Dimca的孤立奇点结果。

Elliptic threefolds with high Mordell-Weil rank

We present the first examples of smooth elliptic Calabi-Yau threefolds with Mordell-Weil rank 10, the highest currently known value. They are given by the Schoen threefolds introduced by Namikawa; there are six isolated fibers of Kodaira Type IV. We explicitly compute the Shioda homomorphism for the generators of the Mordell-Weil group and their induced height pairing. Compactification of F-theory on these threefolds gives an effective theory in six dimensions which contains ten abelian gauge group factors. We compute the massless matter spectrum. In particular, we show that the charged single…

Flops and Mordell-Weil group of Elliptic Threefolds with (4,6,12)-singular fibers

Let $f: W \rightarrow T$ be an elliptic threefold that is a Weierstrass model, which is locally defined by $y^2 = x^3 + fx + g$ over $T$, with a singular fiber such that $(f,g,4f^3 + 27g^2)$ vanishes of order $(4,6,12)$ over an isolated point over $T$. Such a fiber can be explicitly resolved to fibers with smaller vanishing order and the resulting model, $Y$, contains a rational elliptic surface, $S$, where some sections of $S$ are flopping curves on $Y$. As a consequence of this arithmetic and geometric connection, we are able to describe some constraints between flops of $Y$ and the properti…

A Local-global Summation Formula for Abelian Varieties

Let $K$ be a field finitely generated over ${\Q}$, and $A$ an Abelian variety defined over $K$. Then by the Mordell-Weil Theorem, the set of rational points $A(K)$ is a finitely-generated Abelian group. In this paper, assuming Tate's Conjecture on algebraic cycles, we prove a limit formula for the Mordell-Weil rank of an arbitrary family of Abelian varieties $A$ over a number field $k$; this is the Abelian fibration analogue of the Nagao formula for elliptic surfaces $E$, originally conjectured by Nagao, and proven by Rosen and Silverman to be equivalent to Tate's Conjecture for $E$. We also g…

Characteristic numbers of elliptic fibrations with non-trivial Mordell-Weil groups

We compute characteristic numbers of elliptically fibered fourfolds with multisections or non-trivial Mordell-Weil groups. We first consider the models of type E$_{9-d}$ with $d=1,2,3,4$ whose generic fibers are normal elliptic curves of degree $d$. We then analyze the characteristic numbers of the $Q_7$-model, which provides a smooth model for elliptic fibrations of rank one and generalizes the E$_5$, E$_6$, and E$_7$-models. Finally, we examine the characteristic numbers of $G$-models with $G=\text{SO}(n)$ with $n=3,4,5,6$ and $G=\text{PSU}(3)$ whose Mordell-Weil groups are respectively $\ma…

实理查德·莫德尔-韦伊尔群与度数$K^2=1$的德尔皮佐表面上的实线

The real Mordell-Weil group of rational elliptic surfaces and real lines on del Pezzo surfaces of degree $K^2=1$

研究实理查德·莫德尔-韦伊尔群的拓扑性质及德尔皮佐表面上的实线，推导其在映射类群中的显式描述及作用公式。

椭圆面的高度模数：动机高度ζ函数的有理性和Kudla-Millson模性与Mordell-Weil秩跃迁

Analytically dense Mordell-Weil rank jumps on elliptic surfaces via transverse realization

本文研究椭圆面的高度模数，通过动机高度ζ函数的有理性与Kudla-Millson模性，探讨Mordell-Weil秩跃迁问题。

Weil-Chatelet Groups of Rational Elliptic Surfaces

We classify pairs $(S, γ)$, consisting of a rational elliptic surface $S$ and a Galois cover $γ$ of the base, which satisfy a condition we call $\mathcal{L}$-stability. We explain how to use the theory of Mordell-Weil lattices to compute the kernel of the restriction maps of Weil-Chatelet groups for $\mathcal{L}$-stable pairs. We also prove results about the injectivity of restriction maps of Weil-Chatelet groups for some pairs which are not $\mathcal{L}$-stable.

Uniform Bounds for the Number of Rational Points on Symmetric Squares of Curves with Low Mordell-Weil Rank

A central problem in Diophantine geometry is to uniformly bound the number of $K$-rational points on a smooth curve $X/K$ in terms of $K$ and its genus $g$. A recent paper by Stoll proved uniform bounds for the number of $K$-rational points on a hyperelliptic curve $X$ provided that the rank of the Jacobian of $X$ is at most $g - 3$. Katz, Rabinoff and Zureick-Brown generalized his result to arbitrary curves satisfying the same rank condition. In this paper, we prove conditional uniform bounds on the number of rational points on the symmetric square of $X$ outside its algebraic special set, pr…

Mordell-Weil Torsion, Anomalies, and Phase Transitions

We explore how introducing a non-trivial Mordell-Weil group changes the structure of the Coulomb phases of a five-dimensional gauge theory from an M-theory compactified on an elliptically fibered Calabi-Yau threefolds with a I$_2$+I$_4$ collision of singularities. The resulting gauge theory has a semi-simple Lie algebra $\mathfrak{su}(2)\oplus \mathfrak{sp}(4)$ or $\mathfrak{su}(2)\oplus \mathfrak{su}(4)$. We compute topological invariants relevant for the physics, such as the Euler characteristic, Hodge numbers, and triple intersection numbers. We determine the matter representation geometric…