An inductive approach to the Hodge conjecture for abelian varieties
E. Izadi
我们描述了一个归纳的方法，最适合的阿贝尔簇与一个虚二次域的行动。
We describe an inductive approach most appropriate for abelian varieties with an action of an imaginary quadratic field.
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We generalize some results in Hodge theory to generalized normal crossing varieties.
We review a combinatoric approach to the Hodge Conjecture for Fermat Varieties and announce new cases where the conjecture is true.
On the Hodge structure of degenerating hypersurfaces in toric varieties
介绍了一种代数方法来描述射影复曲面簇中退化超曲面的Hodge滤子。为此，我们证明了复曲面簇的真等变态射的对数微分形式的一些基本性质。
Mixed Hodge Structures of cluster varieties of dimension 3
本文计算光滑三维簇簇的混合霍奇数，证明其为混合泰特型，并研究奇异簇簇的上同调与交上同调的混合霍奇结构。
The Hodge Conjecture for general Prym varieties
证明了一般Prym簇的Hodge圈空间是由它的Neron-Severi群生成的。
This is an expository article on the recent developments of Hodge theory on moduli spaces of smooth projective varieties with semi-ample canonical line bundles.
If X is a complex projective variety with klt singularities, then the mixed Hodge structures on the first two singular cohomology groups are pure. We describe the pieces of the Hodge decomposition in terms of reflexive differential forms. Applications include a Lefschetz (1,1) Theorem and a weak analogue of the Hodge-Riemann bilinear relations for klt varieties.
Kuga-Satake varieties and the Hodge conjecture
本文介绍了Kuga-Satake簇，并讨论了与之相关的Hodge猜想的一些问题。Kuga-Satake簇是与一定权重的两个Hodge结构相关联的阿贝尔簇，例如K3曲面的第二上同调群。我们给一个详细的帐户建设的久贺佐竹品种和他们的分解简单的子品种。我们回顾了霍奇猜想，我们指出了霍奇猜想之间的连接交换四倍和Kuga-Satake品种。讨论了Hodge猜想对第二上同调群具有Kuga-Satake簇的曲面几何的影响.我们的结论与最近的一些结果的Kuga-Satake品种的霍奇结构上的一个虚二次域的作用。
We describe in some details an idea of M. Kontsevich how one can try to find a counterexample to the Hodge conjecture using tropical geometry.
We show that certain abelian varieties A have the property that for every Hodge structure V in the cohomology of A, every effective Tate twist of V occurs in the cohomology of some abelian variety. We deduce the general Hodge conjecture for certain non-simple abelian varieties of type IV.
The main result of this paper concerns the positivity of the Hodge bundles of abelian varieties over global function fields. As applications, we obtain some partial results on the Tate--Shafarevich group and the Tate conjecture of surfaces over finite fields.
Hodge classes on abelian varieties of low dimension
本文研究复阿贝尔簇上的Hodge类.我们证明了一些一般的结果，使我们在某些情况下，计算霍奇群的产品阿贝尔簇$X = X_1 \times X_2$一旦我们知道霍奇群的两个因素。利用这些结果，我们可以计算维数为$\leq 5$的所有阿贝尔簇的Hodge群.我们证明了任何这样的阿贝尔簇$X$的Hodge环都是由$X$上的因子类和Weil类生成的.
In this article we construct a Koszul-type resolution of the p-th exterior power of the sheaf of holomorphic differential forms on smooth toric varieties and use this to prove a Nadel-type vanishing theorem for Hodge ideals associated to effective \mathbb{Q}-divisors on smooth projective toric varieties. This extends earlier results of Mustaţă and Popa.
Mixed Hodge Complexes on Algebraic Varieties
引入代数簇上的混合Hodge复形的概念，改进了Du Bois的滤子复形，并将Deligne的混合Hodge结构理论与混合Hodge模理论联系起来.这被认为是正确的，但这是非常不平凡的，因为混合霍奇模的理论不适用于单纯方案。杜波依斯奇异性的一些应用。
On the Log Hodge Theory of Toroidal Varieties and a Partial Proof of the Absolute Hodge Conjecture
本文构建加权环面结构与 Hodge 类障碍理论，借助 $E_1$-退化结果建立范畴 Hodge 对应，证明一类有理加权射影环面簇的绝对 Hodge 猜想。
Algebraicity of Hodge classes on some generalized Prym Varieties
本文通过重新审视Chad Schoen在特定Prym簇上构造的代数环，利用无分歧几何类域论证明某些广义Prym簇上Hodge类的代数性。
In this paper, we show that the mixed Hodge structures of character varieties are of Hodge--Tate type and that the mixed Hodge polynomials are independent of the choice of generic eigenvalues, which is a conjecture due to Hausel, Letellier and Rodriguez-Villegas. Moreover, we investigate the mixed Hodge structures of the moduli space of semistable parabolic Higgs bundles and the moduli space of semistable regular singular parabolic connections. We show that the mixed Hodge structures of these moduli spaces are pure.
The order of the top Chern class of the Hodge bundle on the moduli space of abelian varieties
给出了主极化阿贝尔簇模空间上Hodge丛的顶Chern类的阶的上、下界。
We show that very general hypersurfaces in odd-dimensional simplicial projective toric varieties verifying a certain combinatorial property satisfy the Hodge conjecture (these include projective spaces). This gives a connection between the Oda conjecture and Hodge conjecture. We also give an explicit criterion which depends on the degree for very general hypersurfaces for the combinatorial condition to be verified.
The top Chern class of the Hodge bundle on the moduli space of abelian varieties
给出了主极化阿贝尔簇模空间上Hodge丛的顶Chern类的阶的上、下界。我们也给出了一个推广到更高的属的著名公式$12 λ_1=δ$的亏格1。
On the integral Hodge conjecture for varieties with trivial Chow group
本文构造了全周群有限秩却违反整 Hodge 猜想的复光滑射影簇，并证明此类反例也可定义在数域上。
In this paper we investigate the exactness of the Grassmannian BGG complexes introduced in a previous work (arXiv:1211.2486), and obtain some inequalities between some Hodge numbers of some irregular varieties. In particular, we obtain sharp lower bounds for the Hodge numbers of smooth subvarieties of Abelian varieties, as well as some improvements of results of Lazarsfeld and Popa and Lombardi concerning threefolds and fourfolds.
We give a new proof of a theorem by Pareschi, Popa and Schnell that the direct image of the canonical bundle of a smooth projective variety along a morphism to an abelian variety admits a Chen-Jiang decomposition, without using the theory of Hodge modules.
The Beilinson-Hodge conjecture asserts the surjectivity of the cycle map $$H^n_M(X,\Q(n)) \to {\rm Hom}_{MHS}(\Q(-n),H^n(X,\Q))$$ for all positive integers $n$ and every smooth complex algebraic variety $X$. For $n=2$, we prove the conjecture if $X$ is rational.
We study the monodromies and the limit mixed Hodge structures of families of complete intersection varieties over a punctured disk in the complex plane. For this purpose, we express their motivic nearby fibers in terms of the geometric data of some Newton polyhedra. In particular, the limit mixed Hodge numbers and some part of the Jordan normal forms of the monodromies of such a family will be described very explicitly.
Level $m$-stratifications on PEL Shimura varieties are defined and studied by Wedhorn using BT-$m$s with PEL structure, and then by Vasiu for general Hodge type Shimura varieties using Shimura $F$-crystals. The theory of foliations is established by Oort for Siegel modular varieties, and by Mantovan for PEL Shimura varieties. It plays an important role in Hamacher's work to compute the dimension of Newton strata of PEL Shimura varieties. We study level $m$ stratifications on good reductions at $p>2$ of Shimura varieties of Hodge type by constructing certain torsors together with equivariant mo…
Congruences for the number of rational points, Hodge type and motivic conjectures for Fano varieties
这是一篇为《库博杂志》撰写的调查文章。讨论了有限域上有理点的存在性和个数，复数上的Hodge型，以及控制这些不变量的动机结构.我们提出了一个几何版本。
We know that semi-regular sub-varieties satisfy the variational Hodge conjecture i.e., given a family of smooth projective varieties $π:\mathcal{X} \to B$, a special fiber $\mathcal{X}_o$ and a semi-regular subvariety $Z \subset \mathcal{X}_o$, the cohomology class corresponding to $Z$ remains a Hodge class (as $\mathcal{X}_o$ deforms along $B$) if and only if $Z$ remains an algebraic cycle. In this article, we investigate examples of such sub-varieties. In particular, we prove that any smooth projective variety $Z$ of dimension $n$ is a semi-regular sub-variety of a smooth projective hypersur…
Non-abelian Hodge theory for non-proper varieties and the linear Shafarevich conjecture
本文综述了非交换Hodge理论在非 proper 代数变种中的最新进展，并利用这些工具构造代数Shafarevich映射，证明了对于任何代数变种的线性Shafarevich猜想版本。
Around a class version of the Hodge index theorem for singular varieties
本文概述了奇异复代数簇霍奇指标定理特征类版本的最新进展，澄清了文献中L类概念的关系，并给出了该猜想成立的多种新情况，包括紧 toric 簇、Schubert 簇等。
These are notes of lectures given at the school `Birational Geometry of Hypersurfaces' in Gargnano in March 2018. The main goal was to discuss the Hodge structures that come naturally associated with a cubic fourfold. The emphasis is on the Hodge and lattice theoretic aspects with many technical details worked out explicitly. More geometric or derived results are only hinted at.
For any subfield K of the complex numbers which is not contained in an imaginary quadratic number field, we construct conjugate varieties whose algebras of K-rational (p,p)-classes are not isomorphic. This compares to the Hodge conjecture which predicts isomorphisms when K is contained in an imaginary quadratic number field; additionally, it shows that the complex Hodge structure on the complex cohomology algebra is not invariant under the Aut(\C)-action on varieties. In our proofs, we find simply connected conjugate varieties whose multilinear intersection forms on their second real cohomolog…
We construct canonical non-vanishing global sections of powers of the Hodge bundle on each Ekedahl-Oort stratum of a Hodge type Shimura variety. In particular we recover the quasi-affineness of the Ekedahl-Oort strata. In the projective case, this gives a very short proof of non-emptiness of Ekedahl-Oort strata. It follows that the Newton strata are also nonempty, by a result of S.Nie. We also deduce the fact that the $μ$-ordinary locus is determined by the Ekedahl-Oort strata of its image by any embedding.
A counterexample to the Hodge conjecture for Kaehler varieties
总结：霍奇猜想是问光滑射影流形上的有理霍奇类是否由代数子集类生成，或者等价地由相干层的陈类生成。在紧致Kaehler流形上，若代数子集被解析子集取代，则Hodge猜想是不成立的。在这里，我们表明，它甚至是假的，对于Kaehler流形，霍奇类生成的陈类的相干层。我们还表明，有限自由分解一般不存在的凝聚层紧Kaehler流形。
Cycles Representing The Top Chern Class of the Hodge Bundle on the Moduli Space of Abelian Varieties
我们将著名的亏格1的公式$12 λ=δ$推广到更高的亏格。我们还计算类的某些阶层的佐竹紧化的重言式环的下推的元素。
We establish the Hodge conjecture for some subvarieties of a class of toric varieties. First we study quasi-smooth intersections in a projective simplicial toric variety, which is a suitable notion to generalize smooth complete intersection subvarieties in the toric environment, and in particular quasi-smooth hypersurfaces. We show that under appropriate conditions, the Hodge Conjecture holds for a very general quasi-smooth intersection subvariety, generalizing the work on quasi-smooth hypersurfaces of the first author and Grassi in [3]. We also show that the Hodge Conjecture holds asymptotica…
Hodge symmetry and Lefschetz theorems for singular varieties
该研究证明奇点代数簇拓扑与霍奇理论新结果，揭示奇点复杂度条件与霍奇-杜波依斯菱形对称性的关联，关联有理同调流形理论并在低维有理奇点代数簇中刻画了它。
We prove the structure theorem of the intersection complexes of toric varieties in the category of mixed Hodge modules. This theorem is due to Bernstein, Khovanskii and MacPherson for the underlying complexes with rational coefficients. As a corollary the Euler characteristic Hodge numbers of non-degenerate toric hypersurface can be determined by the Euler characteristic subtotal Hodge numbers together with combinatorial data of Newton polyhedra. This is used implicitly in an explicit formula by Batyrev--Borisov. Note that a formula for the Euler characteristic subtotal Hodge numbers in terms …
Given a complex variety $X$, a linear algebraic group $G$ and a representation $ρ$ of the fundamental group $π\_1(X,x)$ into $G$, we develop a framework for constructing a functorial mixed Hodge structure on the formal local ring of the representation variety of $π\_1(X,x)$ into $G$ at $ρ$ using mixed Hodgediagrams and methods of $L\_\infty$ algebras. We apply it in two geometric situations: either when $X$ is compact K{ä}hler and $ρ$ is the monodromy of a variation of Hodge structure, or when $X$ is smooth quasi-projective and $ρ$ has finite image.
We formulate the "real integral Hodge conjecture", a version of the integral Hodge conjecture for real varieties, and raise the question of its validity for cycles of dimension 1 on uniruled and Calabi-Yau threefolds and on rationally connected varieties. We relate it to the problem of determining the image of the Borel-Haefliger cycle class map for 1-cycles, with the problem of deciding whether a real variety with no real point contains a curve of even geometric genus and with the problem of computing the torsion of the Chow group of 1-cycles of real threefolds. New results about these proble…
We study the structure of string theory flux compactification for a general family of elliptic CY 3-folds. We investigate the locus of the attractor points of the flux compactification in type IIB string theory on the boundary components of period domains. Specifically we give equations describing this locus through the asymptotic of nilpotent orbits on period domains. our approach is a mixture of techniques of asymptotic Hodge theory and the numerical period vectors used in physics.
Differential Forms and Hodge Structures on Singular Varieties
研究奇异复代数变种上的微分形式概念及其与Hodge滤波器的关联，引入并研究称为准有理的奇异性，探讨孤立奇异性条件。
Hodge Conjecture via Singular Varieties
本文利用光滑射影簇与奇异超曲面的双有理关系，证明具有 $A_n$ 奇点的奇数维超曲面满足两种 Hodge 猜想，且其消解满足经典 Hodge 猜想。
We prove the integral Hodge conjecture for one-cycles on a principally polarized complex abelian variety whose minimal class is algebraic. In particular, any product of Jacobians of smooth projective curves over the complex numbers satisfies the integral Hodge conjecture for one-cycles. The main ingredient is a lift of the Fourier transform to integral Chow groups. Similarly, we prove the integral Tate conjecture for one-cycles on the Jacobian of a proper curve of compact type over the separable closure of a finitely generated field. Furthermore, abelian varieties satisfying such a conjecture …
The Hodge conjecture for Weil fourfolds with discriminant 1 via singular OG6-varieties
通过奇异OG6型流形与Weil型判别式1的四维阿贝尔流形的几何关系，证明了Hodge猜想和Tate猜想。
Algebraic cycles of some Fano varieties with Hodge structure of level one
本文研究了具有Hodge结构一级的Fano簇的代数循环，通过étale动机方法证明了光滑四次双五维流形的整数Hodge猜想。
Lengths of Hodge characters in Fermat varieties
本文通过引入长度缩减算法和提升操作，将Fermat簇的Hodge猜想简化为限制例外元组长度，并证明了度数小于65（除44、51、52）的所有Fermat簇的猜想。
In this article we study the (cohomological) Hodge conjecture for singular varieties. We prove the conjecture for simple normal crossing varieties that can be embedded in a family where the Mumford-Tate group remains constant. We show how to produce such families. Furthermore, we show for varieties with worse singularities the conjecture can be expressed solely in terms of the algebraic classes.
Hodge theory of secant varieties
本文研究了secant varieties的Hodge理论，探讨了局部cohomology模块的缺陷及其与原始cohomology的关系，并计算了相关Hodge数和结构，同时改进了文献中的结果。
Hodge integrals and $λ_{g}$ conjecture with target varieties
本文提出带靶簇Hodge积分的$\lambda_{g}$猜想，建立其与Virasoro猜想的关系，并在多类情形下证明该猜想，导出后代Gromov-Witten不变量的新型普适约束。
We establish the real integral Hodge conjecture for 1-cycles on various classes of uniruled threefolds (conic bundles, Fano threefolds with no real point, some del Pezzo fibrations) and on conic bundles over higher-dimensional bases which themselves satisfy the real integral Hodge conjecture for 1-cycles. In addition, we show that rationally connected threefolds over non-archimedean real closed fields do not satisfy the real integral Hodge conjecture in general and that over such fields, Bröcker's EPT theorem remains true for simply connected surfaces of geometric genus zero but fails for some…
Hodge similarities, algebraic classes, and Kuga-Satake varieties
本文引入超凯勒流形超越格的霍奇相似性概念，证明特定 K3 曲面族平方的霍奇猜想，并利用 Kuga-Satake 构造的函子性推出广义 Kummer 形变型超凯勒流形的霍奇相似性均为代数的。
Hodge Theory of $p$-adic analytic varieties: a survey
本文综述了$p$-adic analytic varieties的Hodge理论，重点讨论非proper情况下的新现象及新对象，通过Scholze的完美化方法推动了相关研究。
Real multiplication on K3 surfaces and Kuga Satake varieties
K3型Hodge结构的自同态代数是一个全实域或CM域。在本文中，我们给一个低眉介绍的情况下，一个全实域。我们给出了Hodge结构的存在性结果，它们的极化和某些K3表面。我们认为这些霍奇结构的KugaSatake品种，我们讨论了一些例子。最后，我们指出各种开放的问题有关的霍奇猜想。
Let $k$ be a field of positive characteristic. We prove that the only linear relations between the Hodge numbers $h^{i,j}(X) = \dim H^j(X,Ω_X^i)$ that hold for every smooth proper variety $X$ over $k$ are the ones given by Serre duality. We also show that the only linear combinations of Hodge numbers that are birational invariants of $X$ are given by the span of the $h^{i,0}(X)$ and the $h^{0,j}(X)$ (and their duals $h^{i,n}(X)$ and $h^{n,j}(X)$). The corresponding statements for compact Kähler manifolds were proven by Kotschick and Schreieder.
Let $k$ be an algebraically closed field of any characteristic. Let $X$ be a polarized irreducible smooth projective algebraic variety over $k$. We give criterion for semistability and stability of system of Hodge bundles on $X$. We define notion of generalized opers on $X$, and prove semistability of the Higgs bundle associated to generalized opers. We also show that existence of partial oper structure on a vector bundle $E$ together with a connection $\nabla$ over $X$ implies semistability of the pair $(E, \nabla)$.
Quaternionic pryms and Hodge classes
确定的四元数代数作用于其上的2n维阿贝尔簇被n（n-1）/2维对称域参数化.这样的阿贝尔簇在中维上同调群中有本原Hodge类。一般来说，不清楚这些是循环类。本文证明了一个特殊的6维8重簇是Prym簇，并利用C. Schoen证明了这个族中一般阿贝尔簇上的所有霍奇类都是代数的。我们还考虑霍奇类的某些5维子家庭，并与这些霍奇猜想阿贝尔4倍。
We compute the Hodge-Deligne polynomials of the moduli spaces of representations of the fundamental group of a complex surface into SL(2,C), for the case of small genus g, and allowing the holonomy around a fixed point to be any matrix of SL(2,C), that is Id, -Id, diagonalisable, or of either of the two Jordan types. For this, we introduce a new geometric technique, based on stratifying the space of representations, and on the analysis of the behaviour of the Hodge-Deligne polynomial under fibrations.
For G = GL_2, PGL_2 and SL_2 we prove that the perverse filtration associated to the Hitchin map on the cohomology of the moduli space of twisted G-Higgs bundles on a Riemann surface C agrees with the weight filtration on the cohomology of the twisted G character variety of C, when the cohomologies are identified via non-Abelian Hodge theory. The proof is accomplished by means of a study of the topology of the Hitchin map over the locus of integral spectral curves.
An Inductive Approach to Basepoint-Freeness of Adjoint Series on Irregular Varietiess
本文提出一种归纳方法证明不规则簇上线性系统的无基点性，并在温和条件下证明Fujita猜想对具nef反典范丛的n维不规则簇成立。
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