I. Krichever
We prove Welter's trisecant conjecture: an indecomposable principally polarized abelian variety $X$ is the Jacobian of a curve if and only if there exists a trisecant of its Kummer variety $K(X)$.
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Fay's trisecant formula shows that the Kummer variety of the Jacobian of a smooth projective curve has a four dimensional family of trisecant lines. We study when these lines intersect the theta divisor of the Jacobian, and prove that the Gauss map of the theta divisor is constant on these points of intersection, when defined. We investigate the relation between the Gauss map and multisecant planes of the Kummer variety as well.
Let $Θ$ be a symmetric theta divisor on an indecomposable principally polarized complex abelian variety $X$. The linear system $|2Θ|$ defines a morphism $K:X\ra |2Θ|^*$, whose image is the Kummer variety $K(X)$ of $X$. When $(X,θ)$ is the Jacobian of an algebraic curve, there are infinitely many trisecants lines to $K(X)$. Welters has conjectured that the existence of one trisecant line to the Kummer variety should characterize Jacobians. The purpose of this article is to show the following weak version of Welters conjecture: $X$ is a Jacobian if and only if there exist points $a,b,c$ of $X$ s…
Characterizing Jacobians via the KP equation and via flexes and degenerate trisecants to the Kummer variety: an algebro-geometric approach
本文因定理4证明存在缺陷而撤回，该定理断言阿贝尔簇上丰富线丛完全线性系统的基轨迹既约；其余关于用KP方程和Kummer簇三割线刻画雅可比簇的代数几何证明正确，但依赖该定理的较弱版本。
This paper classifies Enriques surfaces whose K3-cover is a fixed Picard-general Jacobian Kummer surface. There are exactly 31 such surfaces. We describe the free involutions which give these Enriques surfaces explicitly. As a biproduct, we show that Aut(X) is generated by elements of order 2, which is an improvement of the theorem of S. Kondo.
We give two characterizations of Jacobians of curves with involution having fixed points in the framework of two particular cases of Welter's trisecant conjecture. The geometric form of each of these characterizations is the statement that such Jacobians are exactly those containing a shifted Abelian subvariety whose image under the Kummer map is orthogonal to an explicitly given vector.
On the generalised Kummer fourfold of the Jacobian of a genus two curve
本文构造了亏格二曲线雅可比簇的广义Kummer四重簇的双有理模型，利用三次曲线线性系统解释加法律，证明模型有轻微奇点并存在到四维射影空间的有限分歧覆盖。
In this paper we prove the $Γ_{00}$ conjecture of van Geemen and van der Geer, under the additional assumption that the matrix of coefficients of the tangent has rank at most 2. This assumption is satisfied by Jacobians, and thus our result gives a characterization of the locus of Jacobians among all principally polarized abelian varieties. The proof is by reduction to the (stronger version of the) characterization of Jacobians by semidegenerate trisecants, i.e. by the existence of lines tangent to the Kummer variety at one point and intersecting it in another, proven by Krichever in the cours…
We explicitly construct the Kummer variety associated to the Jacobian of a hyperelliptic curve of genus 3 that is defined over a field of characteristic not equal to 2 and has a Weierstraß point defined over the same field. We also construct homogeneous quartic polynomials on the Kummer variety and show that they represent the duplication map.
Coble duality for Jacobian Kummer fourfolds
本文通过 O'Grady 的 theta 群和 Coble 三次簇，建立了 Jacobian 阿贝尔曲面广义 Kummer 四重簇两个奇异模型间的对偶性，并给出任意维奇异 Jacobian Kummer 簇的射影模型，同时构造了 Hilbert 平方上的非自然对合。
We describe all the elliptic fibrations with section on the Kummer surface X of the Jacobian of a very general curve C of genus 2 over an algebraically closed field of characteristic 0, modulo the automorphism group of X and the symmetric group on the Weierstrass points of C. In particular, we compute elliptic parameters and Weierstrass equations for the 25 different fibrations and analyze the reducible fibers and Mordell-Weil lattices. This answers completely a question posed by Kuwata and Shioda in 2008.
Given an abelian variety $X$ and a point $a\in X$ we denote by $<a>$ the closure of the subgroup of $X$ generated by $a$. Let $N=2^g-1$. We denote by $κ: X\to κ(X)\subset\mathbb P^N$ the map from $X$ to its Kummer variety. We prove that an indecomposable abelian variety $X$ is the Jacobian of a curve if and only if there exists a point $a=2b\in X\setminus\{0\}$ such that $<a>$ is irreducible and $κ(b)$ is a flex of $κ(X)$.
Brill-Noether loci on an Enriques surface covered by a Jacobian Kummer surface
针对被 Jacobian Kummer 曲面覆盖的 Enriques 曲面，本文证明其特定秩 2 稳定向量丛模空间中存在真第一 Brill-Noether 轨迹。
We construct and study curves with low H-constants on abelian and K3 surfaces. Using the Kummer $(16_{6})$-configurations on Jacobian surfaces and some $(16_{10})$-configurations of curves on $(1,3)$-polarized Abelian surfaces, we obtain examples of configurations of curves of genus $>1$ on a generic Jacobian K3 surface with H-constants $<-4$.
A note on multisecants of the Kummer variety of a Jacobian
本文研究光滑射影曲线上 $\mathfrak{g}^{n}_{2n}$ 诱导的有理映射，将其纤维与雅可比簇的库默尔簇的 Gunning 多割线建立联系，从而推广了第一作者与 Codogni、Salvati Manni 的已有结果。
Rational curves and the Hilbert Property on Jacobian Kummer varieties
本文在特征零的有限生成域上，证明了与亏格2曲线的Jacobian相关联的所有Kummer曲面具有Hilbert性质，并推广证明与奇数次亏格≥2超椭圆曲线相关联的所有Jacobian Kummer簇也具有该性质。
We derive formulas for the construction of all inequivalent Jacobian elliptic fibrations on the Kummer surface of two non-isogeneous elliptic curves from extremal rational elliptic surfaces by rational base transformations and quadratic twists. We then show that each such decomposition yields a description of the Picard-Fuchs system satisfied by the periods of the holomorphic two-form as either a tensor product of two Gauss' hypergeometric differential equations, an Appell hypergeometric system, or a GKZ differential system. As the answer must be independent of the fibration used, identities r…
In this article, we examine the arithmetic aspect of the Kummer-surface-type CY 3-folds $\hat{T/G}$, characterized by the crepant resolution of 3-torus-orbifold $T/G$ with only isolated singularities. Up to isomorphisms, there are only two such space $\hat{T/G}$ with $|G|=3, 7$, and both $T$ carrying the structure of triple-product structure of a CM elliptic curve. The (Griffiths) intermediate Jacobians of these $\hat{T/G}$ are identified explicitly as the corresponding elliptic curve appeared in the structure of $T$. We further provide the $\QZ$-structure of $\hat{T/G}$ and verify their modul…
We give explicit equations of smooth Jacobian Kummer surfaces of degree 8 by theta functions. As byproducts, we can write down Rosenhain's 80 hyperpanes and 32 lines on these Kummer surfaces explicitly.
The monodromy of generalized Kummer varieties and algebraic cycles on their intermediate Jacobians
本文计算广义 Kummer 簇由阿贝尔曲面导出等价诱导的单值子群并确认其为整个单值群，进而用于证明特定 Weil 型阿贝尔四维簇的 Hodge 猜想及 Kummer 型全纯辛流形上 Abel–Jacobi 映射的满射性。
Kummer surfaces and quadratic line complexes in characteristic two
本文探讨了在特征二条件下二次线复形与库默表面之间的关系及其经典理论的类比。
We explicitly find an equation and a projective embedding of the Kummer surface associated to the Jacobian of a curve of genus 2 given by an equation of the form y^2 + h(x)y = f(x) over an arbitrary ground field as well as several maps that can be used to perform arithmetic on it. This extends earlier work by Flynn and has applications, for instance, in computations of canonical heights for genus 2 Jacobians and in cryptography.
We study effective bounds for Brauer groups of Kummer surfaces associated to the Jacobians of curves of genus $2$ defined over number fields.
We explore some of the interplay between Brill-Noether subvarieties of the moduli space SU_C(2,K) of rank 2 bundles with canonical determinant on a smooth projective curve and 2θdivisors, via the inclusion of the moduli space into |2θ|, singular along the Kummer variety. In particular we show that the moduli space contains all the trisecants of the Kummer and deduce that there are quadrisecant lines only if the curve is hyperelliptic; we show that for generic curves of genus <6, though no higher, bundles with >2 sections are cut out by Γ_00; and that for genus 4 this locus is precisely the Don…
Explicit desingularisation of Kummer surfaces in characteristic two via specialisation
本文通过显式构造和特化方法，研究了特征为二的Kummer面的去奇异性处理及良好减少的条件。
We show that a smooth projective curve of genus $g$ can be reconstructed from its polarized Jacobian $(X, Θ)$ as a certain locus in the Hilbert scheme $\mathrm{Hilb}^d(X)$, for $d=3$ and for $d=g+2$, defined by geometric conditions in terms of the polarization $Θ$. The result is an application of the Gunning--Welters trisecant criterion and the Castelnuovo--Schottky theorem by Pareschi--Popa and Grushevsky, and its scheme theoretic extension by the authors.
We develop an explicit theory of Kummer varieties associated to Jacobians of hyperelliptic curves of genus 3, over any field $k$ of characteristic $\neq 2$. In particular, we provide explicit equations defining the Kummer variety $\mathcal K$ as a subvariety of $\mathbb P^7$, together with explicit polynomials giving the duplication map on $\mathcal K$. A careful study of the degenerations of this map then forms the basis for the development of an explicit theory of heights on such Jacobians when $k$ is a number field. We use this input to obtain a good bound on the difference between naive an…
We use the arithmetic of the Kummer surface associated to the Jacobian of a hyperelliptic curve to study the primality of integers of the form $4m^2 5^n-1$. We provide an algorithm capable of proving the primality or compositeness of most of the integers in these families and discuss in detail the necessary steps to implement this algorithm in a computer. Although an indetermination is possible, in which case another choice of initial parameters should be used, we prove that the probability of reaching this situation is exceedingly low and decreases exponentially with $n$.
Kummer Surfaces, Isogenies and Theta Functions
本文基于西塔函数框架讨论主极化阿贝尔曲面的(n,n)同源及库默尔曲面的几何与计算问题，关注分裂同源情况并探索将里歇洛特同源扩展到高阶以开发高效算法。
We prove and conjecture results which show that Castelnuovo theory in projective space has a close analogue for abelian varieties. This is related to the geometric Schottky problem: our main result is that a principally polarized abelian variety satisfies a precise version of the Castelnuovo Lemma if and only if it is a Jacobian. This result has a surprising connection to the Trisecant Conjecture. We also give a genus bound for curves in abelian varieties.
Let X be a hyperkaehler manifold of Kummer type. We study the 4 dimensional intermediate Jacobian J^3(X) constructed out of the 3rd cohomology of X, motivated by the desire to understand the Kuga-Satake torus associated to X. We prove that there is an embedding of Hodge structures of H^2(X) into H^2(J^3(X)). It follows that if X is projective with polarization L, the projective Kuga-Satake torus of (X,L) is isogenous to the fourth power of J^3(X). By studying the cohomology ring of X, we find that there is a natural smooth quadric Q(X) in the projectivization of H^3(X), with a natural choice o…
Graded Keller maps and the Jacobian Conjecture
探讨加权射影空间有理点稀疏观点对雅可比猜想的意义，证明分次符号模式决定一切，如权重全正等变凯勒映射是自同构，二维任意符号模式也成立，还阐述了凯勒条件在商空间情况及相关轨迹情况，提出按权重签名分类等变多项式映射。
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.
On the Chow ring of very general abelian varieties and a question of Pirola
研究维数≥4的非常一般阿贝尔簇及亏格4的非常一般雅可比簇中满足特定条件的除子性质，利用相关结论证明皮罗拉关于库默纤维化有理截面的猜想。
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