On Beilinson's Hodge and Tate conjectures for open complete intersections

Line bundles, connections, Deligne-Beilinson and absolute Hodge cohomology

It is known that the Picard group of a complex manifold can be expressed as a Deligne cohomology group. One may wonder if the same holds for the Picard group of a smooth algebraic variety and Deligne-Beilinson cohomology but this is not true, as already remarked by M. Saito. We explain how one has to modify the latter, show that the Picard group can be expressed by absolute Hodge cohomology, too, and introduce an intermediate object between Picard group and usual Deligne-Beilinson cohomology group. Similarly as in the case of Deligne cohomology one can relate line bundles with a regular connec…

Beilinson's Hodge Conjecture for K_1 revisited

Let U be a smooth quasiprojective complex variety and CH^r(U,1) a special instance of Bloch's higher Chow groups. Jannsen was the first to show that the cycle class map cl_{r,1} from CH^r(U,1) (tensored with Q) to hom_{MHS}(Q(0), H^{2r-1}(U,Q(r)) is not in general surjective, contradicting an earlier conjecture of Beilinson. In this paper, we give a refinement of Jannsen's counterexample, and further show that the aforementioned cycle class map becomes surjective at the generic point.

Tate Resolutions for Products of Projective Spaces

We describe the Tate resolution of a coherent sheaf or complex of coherent sheaves on a product of projective spaces. Such a resolution makes explicit all the cohomology of all twists of the sheaf, including, for example, the multigraded module of twisted global sections, and also the Beilinson monads of all twists. Although the Tate resolution is highly infinite, any finite number of components can be computed efficiently, starting either from a Beilinson monad or from a multigraded module.

The p-adic Hodge decomposition according to Beilinson

A detailed presentation of Beilinson's approach to p-adic Hodge theory.

Local Beilinson-Tate Operators

In 1968 Tate introduced a new approach to residues on algebraic curves, based on a certain ring of operators that acts on the completion at a point of the function field of the curve. This approach was generalized to higher dimensional algebraic varieties by Beilinson in 1980. However Beilinson's paper had very few details, and his operator-theoretic construction remained cryptic for many years. Currently there is a renewed interest in the Beilinson-Tate approach to residues in higher dimensions. Our paper presents a variant of Beilinson's operator-theoretic construction. We consider an n-dime…

Beilinson's Hodge conjecture for smooth varieties

Consider the cycle class map cl_{r,m} : CH^r(U,m;\Q) \to ΓH^{2r-m}(U,\Q(r)), where CH^r(U,m;\Q) is Bloch's higher Chow group (tensored with \Q) of a smooth complex quasi-projective variety U, and H^{2r-m}(U,\Q(r)) is singular cohomology. We study the image of cl_{r,m} in terms of kernels of Abel-Jacobi maps. When r=m, we deduce from the Bloch-Kato theorem that the cokernel of cl_{r,m} at the generic point of U is the same for integral or rational coefficients.

HPD-invariance of the Tate, Beilinson and Parshin conjectures

We prove that the Tate, Beilinson and Parshin conjectures are invariant under Homological Projective Duality (=HPD). As an application, we obtain a proof of these celebrated conjectures (as well as of the strong form of the Tate conjecture) in the new cases of linear sections of determinantal varieties and complete intersections of quadrics. Furthermore, we extend the original conjectures of Tate, Beilinson and Parshin from schemes to stacks and prove these extended conjectures for certain low-dimensional global orbifolds.

广义库默尔型超凯勒六维流形的霍奇猜想和泰特猜想

The Hodge and Tate conjectures for hyper-Kähler sixfolds of generalized Kummer type

研究广义库默尔型六维超凯勒簇，证明其霍奇猜想和泰特猜想。

Tate twists of Hodge structures arising from abelian varieties of type IV

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.

Mumford Tate groups and the Hodge conjecture

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.

Beilinson-Hodge cycles on semiabelian varieties

Beilinson conjectured that all rational cycles of type (q,q) on the qth cohomology of a smooth complex algebraic variety should come from motivic cohomology. The purpose of this note is to prove this when the variety is a semiabelian variety or a product of curves. The proof is based on the study of invariants under the Mumford-Tate group.

刚性解析空间的相对Hodge-Tate谱序列

The relative Hodge-Tate spectral sequence for rigid analytic spaces

本研究针对Qp的perfectoid域扩张上的刚性解析空间光滑紧合态射，通过推广Scholze的绝对情形策略、证明perfectoid版基变换定理，构造相对Hodge-Tate谱序列，还证得Hodge数局部常值与谱序列退化。

关于模曲线模空间的Hodge和Tate猜想

On the Hodge and Tate conjectures for moduli spaces of curves

本文综述了通过Hodge和Tate猜想视角研究稳定曲线模空间的上同调近期进展，特别是广义的锥形形式如何将Hodge结构和l-adic伽罗华表示与代数循环联系起来，并讨论了开放问题和未来研究方向。

Tate resolutions on toric varieties

We develop an analogue of Eisenbud-Floystad-Schreyer's Tate resolutions for toric varieties. Our construction, which is given by a noncommutative analogue of a Fourier- Mukai transform, works quite generally and provides a new perspective on the relationship between Tate resolutions and Beilinson's resolution of the diagonal. We also develop a Beilinson-type resolution of the diagonal for toric varieties.

Deligne-Beilinson Cohomology of Affine Groups

The goal of this paper is to develop the theory of Deligne-Beilinson cohomology of affine groups with a mixed Hodge structure. The motivation comes from Hodge theory and the study of motives, where such groups appear. Several of Francis Brown's period computations (arXiv:1407.5167) are interpreted as elements of the DB cohomology of the relative unipotent completion of $SL_2(Z)$ and their cup products. The results in this paper are used in arXiv:1403.6443 where they are used to prove that Pollack's quadratic relations are motivic.

Syntomic cohomology and Beilinson's Tate conjecture for $K_2$

In this paper, we study an analogue of the Tate conjecture for $K_2$ of U, the complement of split multiplicative fibers in an elliptic surface. A main result is to give an upper bound of the rank of the Galois fixed part of the etale cohomology $H^2(\bar{U},Q_p(2))$. As an application, we give an elliptic K3 surface $X$ over a p-adic field for which the torsion part of the Chow group $CH_0(X)$ of 0-cycles is finite. This would be the first example of a surface $X$ over a p-adic field whose geometric genus is non-zero and for which the torsion part of $CH_0(X)$ is finite.

Hodge-Tate 叠与刚性空间上 v-完备复形的非交换 $p$-进 Hodge 理论

Hodge-Tate stacks and non-abelian $p$-adic Hodge theory of v-perfect complexes on rigid spaces

本文为刚性空间上的 v-完备复形构造了从 Hodge-Tate 叠到 v-站点的全忠实函子，并用 Higgs 模导出范畴刻画完美复形，从而建立导出的 $p$-进 Simpson 函子。

Bhatt--Lurie猜想与弱$p$-幂零Hodge--Tate栈

A Conjecture of Bhatt--Lurie and weakly $p$-nilpotent Hodge--Tate stacks

本文针对特征p光滑簇上Hodge-Tate晶体子范畴的刻画问题，构造弱p-幂零Hodge-Tate栈建立对应关系，并证明其为带特定结构的gerbe且障碍类匹配Frobenius提升障碍，证明了Bhatt与Lurie的相关猜想。

Hodge-Tate conditions for Landau-Ginzburg models

We give a sufficient condition for a class of tame compactified Landau-Ginzburg models in the sense of Katzarkov-Kontsevich-Pantev to satisfy some versions of their conjectures. We also give examples which satisfy the condition. The relations to the quantum D-modules of Fano manifolds and the original conjectures are explained in Appendices.

Hodge--Tate crystals on the logarithmic prismatic sites of semi-stable formal schemes

Let $\calO_K$ be a complete discrete valuation ring of mixed characteristic $(0,p)$ with a perfect residue field. In this paper, for a semi-stable $p$-adic formal scheme $\frakX$ over $\calO_K$ with rigid generic fibre $X$ and canonical log structure $\calM_{\frakX} = \calO_{\frakX}\cap\calO_X^{\times}$, we study Hodge--Tate crystals over the absolute logarithmic prismatic site $(\frakX,\calM_{\frakX})_{\Prism}$. As an application, we give an equivalence between the category of rational Hodge--Tate crystals on the absolute logarithmic prismatic site $(\frakX,\calM_{\frakX})_{\Prism}$ and the c…

有理极化Hodge结构的Mumford--Tate群的分类

Classification of the Mumford--Tate Groups of Rational Polarizable Hodge Structures

本文通过分解与极化有理Hodge结构相伴的pro-代数群G，将其商、导出群及伴随群分别刻画为Serre群、单连通覆盖及特定单代数群的乘积，从而分类了Mumford--Tate群。

具有刚性解析系数的Hodge-Tate分解

A Hodge-Tate decomposition with rigid analytic coefficients

本文研究了具有局部p-可除系数的Hodge-Tate分解，推广了Faltings和Scholze的结果，并应用于解析Brauer群和几何p-adic Simpson对应关系。

A relative version of the Beilinson-Hodge conjecture

Let k be an algebraically closed subfield of the complex numbers, and X a variety defined over k. One version of the Beilinson-Hodge conjecture that seems to survive scrutiny is the statement that the Betti cycle class map cl_{r,m} : H_M^{2r-m}(k(X),Q(r)) -> hom_{MHS}(Q(0),H^{2r-m}(k(X)(C),Q(r))) is surjective, that being equivalent to the Hodge conjecture in the case m=0. Now consider a smooth and proper map ρ: X -> S of smooth quasi-projective varieties over k. We formulate a version of this conjecture for the generic fibre, expecting the corresponding cycle class map to be surjective. We pr…

Hodge and Tate conjectures for hypergeometric sheaves

A constructible sheaf corresponding to Gel'fand Zelevinski hypergeometric functions on a torus is called hypergeometric sheaf. We consider Hodge and Tate conjectrue for hypergeomtric sheaves. Hodge conjecture is formulated in terms of variation of Hodge strucure and Tate conjecture is done for l-adic sheaves on an open set of torus. We prove Hodge and Tate conjecture up to Hodge and Tate cycle of Fermat motifes. We use cohomological Mellin transform to get the main theorem. This is the final revision for preprint.

关于阿贝尔簇的积分Tate猜想

On the integral Tate conjecture for abelian varieties

本文利用Deligne的绝对Hodge环理论，从Engel等人关于积分Hodge猜想对非常一般阿贝尔簇不成立的结果，推导出积分Tate猜想的类似反例。

Mumford-Tate groups of polarizable Hodge structures

We classify the possible Mumford-Tate groups of polarizable rational Hodge structures. Along the way we deduce a polarized Hodge-theoretic analogue of a conjectural property of motivic Galois groups suggested by Serre.

Positivity of Hodge bundles of abelian varieties over some function fields

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.

积分Hodge/塔特猜想在与投影超曲面的乘积上的失效

On the failure of the integral Hodge/Tate conjecture for products with projective hypersurfaces

本文通过细化无 ramifications cohomology方法，证明了Enriques面与光滑奇维投影超曲面的乘积上积分Hodge/塔特猜想的失效，并推广了Shen的结果到一般代数闭域。

The unipotent radical of the Mumford-Tate group of a very general mixed Hodge structure with a fixed associated graded

The family of all mixed Hodge structures on a given rational vector space $M_\mathbb{Q}$ with a fixed weight filtration $W_\cdot$ and a fixed associated graded Hodge structure $Gr^WM$ is naturally in a one to one correspondence with a complex affine space. We study the unipotent radical of the very general Mumford-Tate group of the family. We do this by using general Tannakian results which relate the unipotent radical of the fundamental group of an object in a filtered Tannakian category to the extension classes of the object coming from the filtration. Our main result shows that if $Gr^WM$ i…

On $p$-adic absolute Hodge cohomology and syntomic coefficients, I

We interpret syntomic cohomology of Nekovář-Nizioł as a $p$-adic absolute Hodge cohomology. This is analogous to the interpretation of Deligne-Beilinson cohomology as an absolute Hodge cohomology by Beilinson and generalizes the results of Bannai and Chiarellotto, Ciccioni, Mazzari in the good reduction case, and of Yamada in the semistable reduction case. This interpretation yields a simple construction of the syntomic descent spectral sequence and its degeneration for proper and smooth varieties. We introduce syntomic coefficients and show that in dimension zero they form a full triangulated…

Operator ideals in Tate objects

Tate's central extension originates from 1968 and has since found many applications to curves. In the 80s Beilinson found an n-dimensional generalization: cubically decomposed algebras, based on ideals of bounded and discrete operators in ind-pro limits of vector spaces. Kato and Beilinson independently defined '(n-)Tate categories' whose objects are formal iterated ind-pro limits in general exact categories. We show that the endomorphism algebras of such objects often carry a cubically decomposed structure, and thus a (higher) Tate central extension. Even better, under very strong assumptions…

The Galois group of the category of mixed Hodge-Tate structures

The category of rational mixed Hodge-Tate structures is a mixed Tate category. So thanks to the Tannakian formalism, it is equivalent to the category of finite dimensional graded comodules over a graded commutative Hopf algebra H over Q. Since the category has homological dimension 1, the Hopf algebra H is isomorphic to the commutative graded Hopf algebra provided by the tensor algebra of the graded vector space given by the direct sum of the groups C/Q(n) over n>0. However this isomorphism is not natural in any sense, e.g. does not work in families. We give a natural explicit construction of …

Hodge-Tate decomposition for non-smooth spaces

In this article, we generalize the Hodge-Tate decomposition of p-adic étale cohomology to non-smooth rigid spaces. Our strategy is to study pro-étale cohomology of rigid spaces introduced by Scholze, using the resolution of singularities and the simplicial method.

The relative Hodge-Tate spectral sequence -- an overview

We give in this note an overview of a recent work leading to a generalization of the Hodge-Tate spectral sequence to morphisms. The latter takes place in Faltings topos, but its construction requires the introduction of a relative variant of this topos which is the main novelty of our work.

Constancy of generalized Hodge-Tate weights of a local system

Sen attached to each p-adic Galois representation of a p-adic field a multiset of numbers called generalized Hodge-Tate weights. In this paper, we discuss a rigidity of these numbers in a geometric family. More precisely, we consider a p-adic local system on a rigid analytic variety over a p-adic field and show that the multiset of generalized Hodge-Tate weights of the local system is constant. The proof uses the p-adic Riemann-Hilbert correspondence by Liu and Zhu, a Sen-Fontaine decompletion theory in the relative setting, and the theory of formal connections. We also discuss basic propertie…

A-D-E图，Hodge-Tate超平面截面与半单量子上同调

A-D-E diagrams, Hodge--Tate hyperplane sections and semisimple quantum cohomology

本文研究了复Grassmannian中Hodge-Tate超平面截面的半单量子上同调性质，提出基于Fano指数和贝蒂数的判据，并验证了Benedetti和Perrin的猜想。

Application de Hodge-Tate duale d'un groupe de Lubin-Tate, immeuble de Bruhat-Tits du groupe lineaire et filtrations de ramification

One of the goals of this article is to describe the isomorphism between Lubin-Tate and Drinfeld towers at the level of their skeletons after taking quotient by $\GL_n (Ø_F)\times Ø_D^\times$ or $I\timesØ_D^\times$ where $Ø_D$ is the maximal order in the division algebra with invariant $\frac{1}{n}$ over $F$ and $I$ a Iwahori subgroup of $\GL_n$. We give applications to the theory of canonical subgroups on Lubin-Tate spaces, the description of spherical Hecke orbits in those spaces, fundamental domains for Hecke correspondences and the Gross-Hopkins period mapping. We also study in details the …

The p-adic Simpson Correspondence II: Functoriality by proper direct image and Hodge-Tate local systems -- an overview

Faltings initiated in 2005 a p-adic analogue of the (complex) Simpson correspondence whose construction has been taken up by various authors, according to several approaches. Following the one we initiated previously, we present an overview of a new monograph developing new features of the p-adic Simpson correspondence, inspired by our construction of the relative Hodge-Tate spectral sequence. First, we address the connection to Hodge-Tate local systems. Second, we establish the functoriality of the p-adic Simpson correspondence by proper direct image. Along the way, we expand the scope of our…

Computing heights via limits of Hodge structures

We consider the problem of explicitly computing Beilinson--Bloch heights of homologically trivial cycles on varieties defined over number fields. Recent results have established a congruence, up to the rational span of logarithms of primes, between the height of certain limit mixed Hodge structures and certain Beilinson--Bloch heights obtained from odd-dimensional hypersurfaces with a node. This congruence suggests a new method to compute Beilinson--Bloch heights. Here we explain how to compute the relevant limit mixed Hodge structures in practice, then apply our computational method to a noda…

The Beilinson regulator is a map of ring spectra

We prove that the Beilinson regulator, which is a map from $K$-theory to absolute Hodge cohomology of a smooth variety, admits a refinement to a map of $E_\infty$-ring spectra in the sense of algebraic topology. To this end we exhibit absolute Hodge cohomology as the cohomology of a commutative differential graded algebra over $\mathbb{R}$. The associated spectrum to this CDGA is the target of the refinement of the regulator and the usual $K$-theory spectrum is the source. To prove this result we compute the space of maps from the motivic $K$-theory spectrum to the motivic spectrum that repres…

Rational Tate classes

In despair, as Deligne (2000) put it, of proving the Hodge and Tate conjectures, we can try to find substitutes. For abelian varieties in characteristic zero, Deligne (1982) constructed a theory of Hodge classes having many of the properties that the algebraic classes would have if the Hodge conjecture were known. In this article I investigate whether there exists a theory of "rational Tate classes" on varieties over finite fields having the properties that the algebraic classes would have if the Hodge and Tate conjectures were known. v3. Submitted version.

Hodge--Tate prismatic crystals与Sen theory

Hodge--Tate prismatic crystals and Sen theory

本文研究了$\mathcal{O}_K$绝对（对数）prismatic site上的Hodge-Tate crystals，通过配备特定小自同态的模完成分类，并在非Galois Kummer塔上构造Sen theory以实现对有理Hodge-Tate crystals的分类。

Hodge-Tate棱镜晶体与Sen理论

Hodge-Tate prismatic crystals and Sen theory

本文通过Kummer塔重建Sen理论，证明Min-Wang猜想：Hodge-Tate棱镜晶体由Sen算子决定，从而等价于近Hodge-Tate表示范畴。

La suite spectrale de Hodge-Tate

The Hodge-Tate spectral sequence for a proper smooth variety over a p-adic field provides a framework for us to revisit Faltings' approach to p-adic Hodge theory and to fill in many details. The spectral sequence is obtained from the Cartan-Leray spectral sequence for the canonical projection from the Faltings topos to the étale topos of an integral model of the variety. Its abutment is computed by Faltings' main comparison theorem from which derive all comparison theorems between p-adic étale cohomology and other p-adic cohomologies, and its initial term is related to the sheaf of differentia…

A remark on potentially semi-stable representations of Hodge-Tate type (0,1)

In this note we complement a part of a theorem of Fontaine-Mazur. We show that if $(V,ρ)$ is an irreducible finite dimensional representation of the Galois group $Gal({\bar K}/K)$ of a finite extension of $K\Q_p$, of Hodge-Tate type $(0,1)$ then it is potentially semi-stable if and only if it is potentially crystalline. This was proved by Fontaine-Mazur for dimension two and $p\geq 5$ by their classfication theorem.

关于Goncharov猜想与Bloch-Kriz混合塔克动机的co-Lie代数关系的论点

On a relation of a conjecture of Goncharov to the co-Lie algebra of Bloch-Kriz mixed Tate motives

研究通过混合塔克动机的co-Lie代数定义从Goncharov群B_n(F)到动机多项式对数的线性映射，支持Beilinson和Soulé关于字段K-群消失的猜想。

Serre-Tate theory for Shimura varieties of Hodge type

We study the formal neighbourhood of a point in $μ$-ordinary locus of an integral model of a Hodge type Shimura variety. We show that this formal neighbourhood has a structure of a shifted cascade. Moreover we show that the CM points on the formal neighbourhood are dense and that the identity section of the shifted cascade corresponds to a lift of the abelian variety which has a characterization in terms of its endomorphisms in analogy with the Serre-Tate canonical lift of an ordinary abelian variety.

准理Hodge-塔普里扎晶体与非阿贝尔p进Hodge理论

Rational Hodge--Tate prismatic crystals of quasi-l.c.i algebras and non-abelian $p$-adic Hodge theory

本文研究了准理Hodge-塔普里扎晶体与非阿贝尔p进Hodge理论的关系，通过范畴等价性揭示了新的理论结果。

f-categories and Tate motives

Using Beilinson's theory of f-categories, we prove that the triangulated category of Tate motives over a field k is equivalent to the bounded derived category of its heart, provided that k is algebraic over the rationals. This answers a question asked by Levine.

Arithmetic Hodge structure and higher Abel-Jacobi maps

In this paper, we show some applications to algebraic cycles by using higher Abel-Jacobi maps which were defined in [the author: Motives and algebraic de Rham cohomology]. In particular, we prove that the Beilinson conjecture on algebraic cycles over number fields implies the Bloch conjecture on zero-cycles on surfaces. Moreover, we construct a zero-cycle on a product of curves whose Mumford invariant vanishes, but not higher Abel-Jacobi invariant.

Tate conjecture and mixed perverse sheaves

Using the theory of mixed perverse sheaves, we extend arguments on the Hodge conjecture initiated by Lefschetz and Griffiths to the case of the Tate conjecture, and show that the Tate conjecture for divisors is closely related to the de Rham conjecture for nonproper varieties, finiteness of the Tate-Shafarevich groups, and also to some conjectures in the analytic number theory.

环形紧化与Mumford-Tate域的堆叠上同调

Toroidal Compactifications and Stacky Cohomology of Mumford--Tate Domains

本文构造并研究了Mumford-Tate域的log-toric Hodge堆栈，通过将Kato-Usui部分紧化由neat算术群商得，实现了Hodge理论与堆栈边界数据的分离。

Torsion subschemes and the Tate-Voloch conjecture over p-adic fields

We give a new proof of the Tate-Voloch conjecture, in the situation where the ambient variety is a semiabelian variety defined over Qp. Our proof is new in the sense that it avoids any reference to algebraic model theory or p-adic Hodge theory.

具有不完备剩余域的$p$进局部域上阿贝尔簇的Faltings扩张与Hodge-Tate滤过

Faltings extension and Hodge-Tate filtration for abelian varieties over $p$-adic local fields with imperfect residue fields

针对剩余域不完备的特征0p进局部域，定义Z_p上O_K的Faltings扩张，推广Fontaine1981年的构造，为该类域上的阿贝尔簇构建Hodge-Tate滤过。