Sebastian Casalaina-Martin, Mihnea Popa, Stefan Schreieder
We classify GV-subschemes of five-dimensional ppavs, showing that they exist only on Jacobians of curves and intermediate Jacobians of cubic threefolds, and confirming a conjecture of Pareschi--Popa in this case. The result is implied by a more general statement about subvarieties of minimal cohomology class whose sum is a theta divisor.
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Given a very general abelian fivefold $A$ and a principal polarization $Θ\subset A$, we construct surfaces generating the algebraic part of the middle cohomology $H^4(Θ, {\mathbb Q})$, and determine the intersection pairing between these surfaces. In particular, we obtain a new proof of the Hodge conjecture for $H^4(Θ, {\mathbb Q})$ and show that it contains a copy of the root lattice of $E_6$.
The primitive cohomology of the theta divisor of a principally polarized abelian variety of dimension $g$ is a Hodge structure of level $g-3$. The Hodge conjecture predicts that it is contained in the image, under the Abel-Jacobi map, of the cohomology of a family of curves in the theta divisor. In this paper we use the Prym map to show that this version of the Hodge conjecture is true for the theta divisor of a general abelian fivefold.
The primal cohomology $\mathbb{K}_\mathbb{Q}$ of the theta divisor $Θ$ of a principally polarized abelian fivefold (ppav) is the direct sum of its invariant and anti-invariant parts $\mathbb{K}_\mathbb{Q}^{+1}$, resp. $\mathbb{K}_\mathbb{Q}^{-1}$ under the action of $-1$. For smooth $Θ$, these have dimension $6$ and $72$ respectively. We show that $\mathbb{K}_\mathbb{Q}^{+1}$ consists of Hodge classes and, for a very general ppav, $\mathbb{K}_\mathbb{Q}^{-1}$ is a simple Hodge structure of level $2$.
Cohomology of rational forms and a vanishing theorem on toric varieties
我们明确地描述了上同调层的微分形式与极点沿半样本因子上一个完整的单纯复曲面品种。作为应用，我们得到了一个新的消灭定理，它是Bott-Steenbrink-Danilov消灭定理的一个类似.
We study the relationship between positivity of line bundles restricted to complete intersection subvarieties and the vanishing of higher cohomology groups. Based on this connection we prove generalizations of the vanishing theorems of Kawamata-Viehweg and Fujita that are valid for not necessarily big line bundles.
Vanishing theorem for the cohomology of line bundles on Bott-Samelson varieties
利用Bott-Samelson簇的Toric退化和Toric簇上线丛的上同调的描述，导出了Bott-Samelson簇上线丛的上同调的消失结果.
We show that a cone theorem for ${\mathbbA}^1-homotopy invariant contravariant functors implies the vanishing of the positive degree part of the operational Chow cohomology rings of a large class of affine varieties. We also discuss how this vanishing relates to a number of questions about representing Chow cohomology classes of GIT quotients in terms of equivariant cycles.
In this Note we prove the vanishing of (twisted) Koszul cohomology groups $K_{p,1}$ of an abelian variety with values in powers of an ample line bundle. It complements the work of G. Pareschi on the property $(N_p)$.
We use representation theory and Bott's theorem to show vanishing of higher cotangent cohomology modules for the homogeneous coordinate ring of Grassmannians in the Plücker embedding. As a biproduct we answer a question of Wahl about the cohomology of the square of the ideal sheaf for the case of Plücker relations.
Generic vanishing and minimal cohomology classes on abelian varieties
我们建立了一个，并猜测进一步，存在的子品种之间的关系，代表最小上同调类的主要极化阿贝尔簇，和通用的消失某些层上同调。主要成分是基于Fourier-Mukai变换的数学AG/0608127中的类属消失准则。
We give a sufficient condition to study the vanishing of certain Koszul cohomology groups for general pairs $(X,L)\in W^r_{g,d}$ by induction. As an application, we show that to prove the Maximal Rank Conjecture (for quadrics), it suffices to check all cases with the Brill-Noether number $ρ=0$.
The purpose of this paper is to show that the third unramified cohomology with divisible coefficients of a smooth projective geometrically rational threefold over a finite field must vanish under $\Z_{\ell}$-exactness Hard Lefschetz condition.
Vanishing of cohomology in infinitely ramified towers
本文通过使用近旁周期的反常性（全局形式），给出了Esnault关于射影空间的“模拟”Frobenius覆盖塔中可构造层的上同调消失结果的新证明。
Non-vanishing for Koszul cohomology of curves
我们在听取了裁判员的意见后对试卷进行了全面修改。在新的版本中，我们替换了两个错误的例子，研究了与Koh和Stilmann早期工作的联系，并加强了主要定理。
Cohomology Vanishing, Koszul Cohomology and Multigraded Regularity on Projective Varieties
本文在多重分次Castelnuovo–Mumford正则性框架下，证明射影簇的通用上同调消失定理，推广前期工作，刻画射影空间乘积线丛的极小正则性，重证Green定理并计算超椭圆曲线典范像的Betti表。
Perverse Cohomology and the Vanishing Index Theorem
复解析空间上的层复形的特征圈提供了关于复形的弱信息;本质上，它产生了层的正常数据的超上同调的欧拉示性数。我们展示了如何反常上同调实际上允许提取个人贝蒂数的超上同调的正常数据的地层，而不仅仅是欧拉示性数。我们将其应用于“计算”一个复杂的消失周期，并将其与Parusibiski和Briançon，Maisonobe和Merle关于Thom的$a_f$条件的工作联系起来。
Hodge theory of degenerations, (II): vanishing cohomology and geometric applications
本文研究孤立超曲面奇点的加权谱和消失上同调，揭示其对光滑化极限混合Hodge结构的作用，并应用于紧化与镜像对称中的多类奇点。
In this paper, we prove the irreducibility of the monodromy action on the anti-invariant part of the vanishing cohomology on a double cover of a very general element in an ample hypersurface of a complex smooth projective variety branched at an ample divisor. As an application, we study dominant rational maps from a double cover of a very general surface $S$ of degree$\geq 7$ in ${\mathbb P}^3$ branched at a very general quadric surface to smooth projective surfaces $Z$. Our method combines the classification theory of algebraic surfaces, deformation theory, and Hodge theory.
We study the vanishing cycle complex $φ_fA_X$ for a holomorphic function $f$ on a reduced complex analytic space $X$ with $A$ a Dedekind domain (for instance, a localization of the ring of integers of a cyclotomic field, where the monodromy eigenvalue decomposition may hold after a localization of $A$). Assuming the perversity of the shifted constant sheaf $A_X[d_X]$, we show that the lowest possibly-non-zero vanishing cohomology at $0\in X$ can be calculated by the restriction of $φ_fA_X$ to an appropriate nearby curve in the singular locus $Y$ of $f$, which is given by intersecting $Y$ with …
We employ the formalism of vanishing cycles and perverse sheaves to introduce and study the vanishing cohomology of complex projective hypersurfaces. As a consequence, we give upper bounds for the Betti numbers of projective hypersurfaces, generalizing those obtained by different methods by Dimca in the isolated singularities case, and by Siersma-Tibăr in the case of hypersurfaces with a $1$-dimensional singular locus. We also prove a supplement to the Lefschetz hyperplane theorem for hypersurfaces, which takes the dimension of the singular locus into account, and we use it to give a new proof…
Vanishing theorems for Dolbeault cohomology of log homogeneous varieties
我们考虑$\bC$上的完全非奇异簇$X$，它有一个正规交叉因子$D$，使得相关的对数切丛由它的整体截面生成.我们证明了$H^i\big(X, L^{-1} \otimes Ω_X^j(\log D)\big) = 0$对$X$和所有$i < j - c$上的任何Nef线丛$L$，其中$c$是$(X,D,L)$的显函数。这意味着例如对于$L$样本和$i > j$，$H^i(X, L \otimes Ω_X^j)$消失，并且当$X$是标志簇时，返回Broer消失定理。
Threefolds with Vanishing Hodge Cohomology
考虑$\Bbb{C}$上的3维代数流形$Y$，其中对所有$j\geq 0$和$i>0$都有$H^i(Y, Ω^j_Y)=0$.设$X$是$Y$与$D=X-Y$的光滑完备化，$D=X-Y$是$X$上具有正常交叉的有效除数。如果$X$的$D$维数不为零，则$Y$是平滑仿射曲线$C$上的纤维空间（即，我们有从$Y$到$C$的满射态射，使得一般纤维是光滑的和不可约的），使得每个纤维满足相同的消失条件。如果不可约光滑纤维不是仿射的，则$X$的Kodaira维数是$-\infty$，X的$D$ -维数是1。我们还从纤维或更高的直接象的性质讨论了保证Hodge上同调全局消失和$Y$仿射的充分条件。
Hodge number polynomials for nearby and vanishing cohomology
我们回顾建设的霍奇字符，我们表明，使用的结果，由于F。Bittner，这些可以构造使用经典的纯霍奇理论，回避德利涅的建设函混合霍奇结构上同调的algberaic品种。然后，我们给出一个证明，根据弱分解定理，附近的纤维是定义良好的Grothendieck群品种。最后，给出了与射影流形的单参数退化相关的Hodge理论原点的数值不变量的各种公式。
Gentle Introduction of Unitary Cohomology Vanishing
本文基于李红山的工作，以导论形式介绍酉上同调消失定理，探讨复流形上酉局部系统的性质，分析典范扩张、谱序列、Higgs丛等内容，证明相关谱序列E1退化，深化对酉局部系统上同调性质的理解。
Consider a complex Stein manifold X and a subanalytic relatively compact Stein open subset U of X.. We prove the vanishing on U of the holomorphic temperate cohomology.
We give sharp bounds on the vanishing of the cohomology of a tensor product of vector bundles on the n-dimensional projective space in terms of the vanishing of the cohomology of the factors. For this purpose we introduce regularity indices generalizing the Castelnuovo-Mumford regularity. As an application we give a sufficient condition for a vector bundle to have an unobstructed deformation theory that depends only on the cohomology table of the bundle. We construct complete families of bundles with such cohomology tables.
We employ the perverse vanishing cycles to show that each reduced cohomology group of the Milnor fiber, except the top two, can be computed from the restriction of the vanishing cycle complex to only singular strata with a certain lower bound in dimension. Guided by geometric results, we alternately use the nearby and vanishing cycle functors to derive information about the Milnor fiber cohomology via iterated slicing by generic hyperplanes. These lead to the description of the reduced cohomology groups, except the top two, in terms of the vanishing cohomology of the nearby section. We use it …
Mixed Hodge structures for vanishing cycles and orbifold cohomology
研究消失环的混合Hodge结构与orbifold上同调的极化关系，探讨Hodge-Tate情况下的上同调结构。
Unramified cohomology of finite groups of Lie type
证明了李型有限群的非分歧稳定上同调的消失结果。
A partial Horn recursion in the cohomology of flag varieties
Horn递归是一个术语，用来描述当复旗簇的上同调中的舒伯特类的非零乘积由“较小”旗簇的上同调中的类似非零乘积参数化的不等式表征时。我们考虑A型部分旗簇，发现它的上同调在Belkale和Kumar在\cite{BK06}中定义的上积的某种变形上表现出Horn递归.我们还表明，如果产品的舒伯特类是非零的这种变形，那么相关的结构常数可以写在结构常数来自诱导格拉斯曼。
Dimensional vanishing of the saturated de Rham-Witt complex
本文研究了饱和de Rham-Witt复形在奇异方案上的维度消逝性质，证明其在存在奇点时仍保持良好的消逝性质，优于传统上同调理论。
Two decades ago, as part of their work of generic vanishing theorems, Green-Lazarsfeld showed that over a compact Kahler manifold $X$, the cohomology jump loci in the $Pic^τ(X)$ are all translates of subtori. In this paper, we generalize this result to higher dimensional vector bundles. It is showed by Nadel that locally the moduli space of vector bundles with vanishing chern classes is canonically isomorphic to a quadratic cone in the Zariski tangent space of a point. We prove that under the isomorphism, the cohomology jump loci are defined by linear equations.
Polynomial point counts and odd cohomology vanishing on moduli spaces of stable curves
本文通过基于 Hasse-Weil zeta 函数的筛法计算 M_{4,n}（n≤3）的 F_q-点数为 q 的多项式，并证明任意亏格稳定曲线模空间的奇数次上同调在次数≤9时消失，从而证实 Langlands 纲领预测并解决 Arbarello-Cornalba 问题。
This paper has been withdrawn by the author due to a crucial sign error in Theorem 3.4.
We study the deformation-obstruction theory of Koszul cohomology groups of $g^r_d$'s on singular nodal curves. We compute the obstruction classes for Koszul cohomology classes on singular curves to deform to a smooth one. In the case the obstructions are nontrivial, we obtain some partial results for generic vanishing of Koszul cohomology groups.
Cohomology of the differential fundamental group of algebraic curves
本文研究特征零域上光滑射影曲线的微分基本群，通过Tannakian对偶定义，探讨带联络向量丛的de Rham上同调与对应表示的群上同调的关系，并得到消没与非消没结果。
Non-vanishing of the twisted cohomology on the complement of hypersurfaces
在一般情形下，与超曲面补上局部系中系数的上同调除了在最高维之外都为零。我们的问题是当局部系统上同调不为零。在超平面排列的情况下，发现了许多例子。在本文中，我们将把它们的例子推广到超曲面。得到了由某些线性系给出的超曲面具有非零的局部系上同调。
We study cohomology support loci and higher direct images of (log) pluricanonical bundles of smooth projective varieties or log canonical pairs. We prove that the 0-th cohomology support loci of log pluricanonical bundles are finite unions of torsion translates of subtori. We also construct an example of morphism from a smooth projective variety to an abelian variety such that a higher direct image of a pluricanonical bundle to the abelian variety is not a GV-sheaf.
Cohomology of projective schemes: From annihilators to vanishing
我们提供的Castelnuovo-Mumford正则性方面的“定义方程”的界限，通过使用元素，湮灭一些上同调模块，宫崎，内格尔，Schenzel和Vogel的作品的启发。这些零化子中的元素由联络理论或紧闭理论提供。我们的结果适用于任何特征。
Surjectivity of some local cohomology map and the second vanishing theorem
本文研究了完全分枝正则局部环中第二消失定理的部分解答，基于局部上同调理论中的 surjective 元素理论进行证明。
This work discusses combinatorial and arithmetic aspects of cohomology vanishing for divisorial sheaves on toric varieties. We obtain a refined variant of the Kawamata-Viehweg theorem which is slightly stronger. Moreover, we prove a new vanishing theorem related to divisors whose inverse is nef and has small Kodaira dimension. Finally, we give a new criterion for divisorial sheaves for being maximal Cohen-Macaulay.
In this paper, we study relations between positivity of the curvature and the asymptotic behavior of the higher cohomology group for tensor powers of a holomorphic line bundle. The Andreotti-Grauert vanishing theorem asserts that partial positivity of the curvature implies asymptotic vanishing of certain higher cohomology groups. We investigate the converse implication of this theorem under various situations. For example, we consider the case where a line bundle is semi-ample or big. Moreover, we show the converse implication holds on a projective surface without any assumptions on a line bun…
On the vanishing, artinianness and finiteness of local cohomology modules
设$R$是诺特环，$\fa$是$R$的理想，$M$是$R$ --模.证明了对有限模$M$，若$\LC^{i}_{\fa}(M)$对所有$i\geq r\geq 1$是minimax，则$\LC^{i}_{\fa}(M)$对$i\geq r$是artinian.给出了极大极小局部上同调模的局部-整体原理。如果$\LC^{i}_{\fa}(M)$对于$i\leq r$是共原子的（$M$有限），则$\LC^{i}_{\fa}(M)$对于$i\leq r$是有限的。给出了局部极大极小模成为极大极小模的条件。证明了局部上同调模的一个非零定理和几个消灭定理.
Using $L^2$-methods, we prove a vanishing theorem for tame harmonic bundles over quasi-compact Kähler manifolds in a very general setting. As a special case, we give a completely new proof of the Kodaira type vanishing theorems for Higgs bundles due to Arapura. To prove our vanishing theorem, we construct a fine resolution of the Dolbeault complex for tame harmonic bundles via the complex of sheaves of $L^2$-forms, and we establish the Hörmander $L^2$-estimate and solve $(\bar{\partial}_E+θ)$-equations for Higgs bundles $(E,θ)$.
The Second Vanishing Theorem in Ramified Mixed Characteristic
在正则局部分岔混合特征标环上证明了局部上同调模的第二消没定理，并给出若干应用。
We show that the mod $p$ cohomology of a simple Shimura variety treated in Harris-Taylor's book vanishes outside a certain nontrivial range after localizing at any non-Eisenstein ideal of the Hecke algebra. In cases of low dimensions, we show the vanishing outside the middle degree.
A general vanishing result for the first cohomology group of affine smooth complex varieties with values in rank one local systems is established. This is applied to the determination of the monodromy action on the first cohomology group of the Milnor fiber of some line arrangements, including the monomial arrangement and the exceptional reflection arrangement of type $G_{31}$.
We use a Mayer-Vietoris-like spectral sequence to establish vanishing results for the cohomology of complements of linear and elliptic hyperplane arrangements, as part of a more general framework involving duality and abelian duality properties of spaces and groups. In the process, we consider cohomology of local systems with a general, Cohen-Macaulay-type condition. As a result, we recover known vanishing theorems for rank-1 local systems as well as group ring coefficients, and obtain new generalizations.
Using the work of Fargues-Scholze, we prove a vanishing theorem for the generic unramified part of the cohomology of local Shimura varieties of general linear groups. This gives an alternative approach to vanishing results of Caraiani-Scholze for the cohomology of unitary Shimura varieties.
Define a line bundle L on a projective variety to be q-ample, for a natural number q, if tensoring with high powers of L kills coherent sheaf cohomology above dimension q. Thus 0-ampleness is the usual notion of ampleness. Intuitively, a line bundle is q-ample if it is positive "in all but at most q directions". We show that q-ampleness of a line bundle on a projective variety in characteristic zero is equivalent to the vanishing of an explicit finite list of cohomology groups. It follows that q-ampleness is a Zariski open condition, which is not clear from the definition. We also show that a …
There Exist Nontrivial Threefolds with Vanishing Hodge Cohomology
通过证明某些开曲面的形变不变量，用$H^i(Y, Ω^j_Y)=0$对所有$j\geq 0$，$i>0$和$h^0(Y, {\mathcal{O}}_Y) > 1$分析了三维代数流形$Y$的结构.其次，我们证明了当一个光滑的三重非常数正则函数满足消失Hodge上同调。作为应用，我们证明了存在的非仿射和非产品的三重$Y$与此属性，通过构建一个家庭的某种类型的开曲面参数化的仿射曲线$\C-\{0\}$，使相应的光滑完成$X$有Kodaira维数$-\infty$和$D$ -维数1，其中$D$是有效的边界因子与支持$X-Y$。
Let $k$ be a finite field, a $p$-adic field or a number field. Let $K$ be a finite extension of the Laurent series field in $m$ variables $k((x_1,...,x_m))$ or, more generally, a finite extension of the field of rational functions $k((x_1,...,x_m))(y_1,...,y_n)$. When $r$ is an integer, we consider the Galois module $\mathbb{Q}/\mathbb{Z}(r)$ over $K$ and we prove several vanishing theorems for its cohomology. In the particular case when $K$ is a finite extension of the Laurent series field in two variables $k((x_1,x_2))$, we also prove exact sequences that play the role of the Brauer-Hasse-No…
Weibel vanishing and the projective bundle formula for mixed characteristic motivic cohomology
本文证明混合特征概形的母题上同调满足Weibel消没的母题精细化、射影丛公式等预期性质，并将其与Milnor K理论比较，从而把Elmanto–Morrow的结果推广到非域上概形。
Vanishing of local cohomology in unramified mixed characteristic
本文在非分歧混合特征环境下扩展了 Faltings 关于理想上同调维数的上界结果，并证明该上界是紧致的。
Let $X$ be a closed equidimensional local complete intersection subscheme of a smooth projective scheme $Y$ over a field, and let $X_t$ denote the $t$-th thickening of $X$ in $Y$. Fix an ample line bundle $\mathcal{O}_Y(1)$ on $Y$. We prove the following asymptotic formulation of the Kodaira vanishing theorem: there exists an integer $c$, such that for all integers $t \geqslant 1$, the cohomology group $H^k(X_t,\mathcal{O}_{X_t}(j))$ vanishes for $k < \dim X$ and $j < -ct$. Note that there are no restrictions on the characteristic of the field, or on the singular locus of $X$. We also construc…
Epimorphisms of local cohomology modules, a general Peskine-Szpiro theorem, and an application to sheaf cohomology vanishing for thickenings
本文研究局部上同调模的满射性质，推广Peskine-Szpiro定理，并证明了增厚子方案上同调的Kodaira型消失定理。
We study the $L^2$--cohomology of certain local systems on non-compact arithmetic ball quotients $X=Γ\backslash \B_n$, in particular vanishing and non--vanishing results. We also give generalizations to higher dimensional ball quotients and study the mixed Hodge structure on the sheaf cohomology of a local system with the $L^2$-cohomology contributing to the lowest weight part.
The aim of this paper is to classify simply connected 6-dimensional torus manifolds with vanishing odd degree cohomology. It is shown that there is a one-to-one correspondence between equivariant diffeomorphism types of these manifolds and 3-valent labelled graphs, called torus graphs introduced by Maeda-Masuda-Panov. Using this correspondence and combinatorial arguments, we prove that a simply connected 6-dimensional torus manifold with vanishing odd degree cohomology is equivariantly diffeomorphic to the 6-dimensional sphere or an equivariant connected sum of copies of 6-dimensional quasitor…
Vanishing results for the coherent cohomology of automorphic vector bundles over the Siegel variety in positive characteristic
本文证明了正特征Siegel簇上自守向量丛的凝聚上同调在特定权条件下的消失结果，并提供了Sage算法以显式计算。
Vanishing theorems on wonderful varieties
本文研究了奇妙簇上重言丛的消没定理，证明了Brieskorn结果的类似物及Orlik--Solomon代数的比较定理，扩展了Borel--Weil--Bott型消没定理，并将White基猜想的弱版本归约为上同调消没问题。
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