Claudio Onorati
We compute the monodromy group of irreducible holomorphic symplectic manifolds of OG10 type, confirming a conjecture of Markman.
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By using sheaf-theoretical methods such as constructible sheaves, we generalize the formula of Libgober-Sperber concerning the zeta functions of monodromy at infinity of polynomial maps into various directions. In particular, some formulas for the zeta functions of global monodromy along the fibers of bifurcation points of polynomial maps will be obtained.
We study the Tannakian properties of the category of perverse sheaves on elliptic curves endowed with the convolution product. We establish that for certain sheaves with unipotent local monodromy over seven points the corresponding Tannaka group is isomorphic to $G_2$. This monodromy approach generalizes a result of Katz on the existence of $G_2$-motives in the middle cohomology of deformations of Beauville surfaces.
Hodge-Grothendieck classes and monodromy invariants of nearby cycles sheaves
研究邻近周期层的 Hodge-Grothendieck 类与单值化不变量，评述邻近周期函子并证明广义局部不变周期结果。
Locally trivial monodromy of moduli spaces of sheaves on Abelian surfaces
本文研究了阿贝尔曲面上非原始 Mukai 向量对应的半稳定层模空间，证明其奇异模空间的局部平凡单值群同构于光滑模空间的单值群，并由此证明了 SYZ 猜想。
Locally trivial monodromy of moduli spaces of sheaves on K3 surfaces
本文通过将本原Mukai向量对应的层模空间作为最奇异轨迹嵌入非本原模空间，证明了二者单值群同构，从而把Markman的结果推广到非本原情形。
Local Monodromy of Constructible Sheaves
研究复代数簇间态射下可构造层的局部单值性，推广了拟幂单层情形下的经典结果，并应用于阿贝尔覆盖和广义Alexander模。
Let S be a K3 surface and Aut D(S) the group of auto-equivalences of the derived category of S. We construct a natural representation of Aut D(S) on the cohomology of all moduli spaces of stable sheaves (with primitive Mukai vectors) on S. The main result of this paper is the precise relation of this action with the monodromy of the Hilbert schemes S^[n] of points on the surface. A formula is provided for the monodromy representation, in terms of the Chern character of the universal sheaf. Isometries of the second cohomology of S^[n] are lifted, via this formula, to monodromy operators of the …
We provide an effective version of Katz' criterion for finiteness of the monodromy group of a lisse, pure of weight zero, $\ell$-adic sheaf on a normal variety over a finite field, depending on the numerical complexity of the sheaf
Let S be a K3 surface. In part I of this paper, we constructed a representation of the group Aut D(S), of auto-equivalences of the derived category of S. We interpreted this infinite dimensional representation, as the natural action of Aut D(S) on the cohomology of all moduli spaces of stable sheaves (with primitive Mukai vectors) on S. The main result, of part I, is the precise relation of this action with the monodromy of the Hilbert schemes S^[n] of points on the surface. The proof of the above result was reduced, in part I, to the case of two monodromy operators of S^[n], associated with c…
Hypergeometric sheaves with tannakian monodromy group $G_2$
本文通过超几何和的傅里叶变换统一性结果，确定其单子群为 $G_2$。
Let $X$ be a smooth connected algebraic curve over an algebraically closed field $k$. We study the deformation of $\ell$-adic Galois representations of the function field of $X$ while keeping the local Galois representations at all places undeformed.
The monodromy groups of lisse sheaves and overconvergent $F$-isocrystals
本研究将有限域光滑曲线上相容半单纯光滑层单值群的相关结果，推广到任意光滑簇上的半单光滑层与超收敛F-等晶相容系统，拓展了Frobenius环面定理，并用Tannakian形式明确了两类系数对象的相似性。
Computing the Roots of Twisting Sheaves over the Projective Line arising from Monodromy Representations
本文研究由射影直线上单值表示产生的向量丛在对数联络延拓下的分解问题，通过计算扭曲层的根，给出了 m=2 时所有有限维表示及 m=3 时维数小于 3 的表示的完整分解结果。
Deligne constructed a remarkable local system on $\bP^1-\{0,\infty\}$ attached to a family of Kloosterman sums. Katz calculated its monodromy and asked whether there are Kloosterman sheaves for general reductive groups and which automorphic forms should be attached to these local systems under the Langlands correspondence. Motivated by work of Gross and Frenkel-Gross we find an explicit family of such automorphic forms and even a simple family of automorphic sheaves in the framework of the geometric Langlands program. We use these automorphic sheaves to construct l-adic Kloosterman sheaves for…
We interprete results of Markman on monodromy operators as a universality statement for descendent integrals over moduli spaces of stable sheaves on $K3$ surfaces. This yields effective methods to reduce these descendent integrals to integrals over the punctual Hilbert scheme of the $K3$ surface. As an application we establish the higher rank Segre-Verlinde correspondence for $K3$ surfaces as conjectured by Göttsche and Kool.
We study the vanishing cycles of a one-parameter smoothing of a complex analytic space and show that the weight filtration on its perverse cohomology sheaf of the highest degree is quite close to the monodromy filtration so that its graded pieces have a modified Lefschetz decomposition. We describe its primitive part using the weight filtration on the perverse cohomology sheaves of the constant sheaves. As a corollary we show in the local complete intersection case that 1 is not an eigenvalue of the monodromy on the reduced Milnor cohomology at any points if and only if the total space and the…
We propose a new sheaf-theoretical method for the calculation of the monodromy zeta functions of Milnor fibrations. As an application, classical formulas of Kushnirenko and Varchenko etc. concerning polynomials on $\CC^n$ will be generalized to polynomial functions on any toric variety.
We compute Stokes matrices and monodromy for the quantum cohomology of projective spaces. We prove that the Stokes' matrix of the quantum cohomology coincides with the Gram matrix in the theory of derived categories of coherent sheaves.
We develop a theory of perverse sheaves on the semi-infinite flag manifold $G((t))/N((t))\cdot T[[t]]$, and show that the subcategory of Iwahori-monodromy perverse sheaves is equivalent to the regular block of the category of representations of the small quantum group at an even root of unity.
For a split reductive group $G$ over a finite field, we show that the neutral block of its mixed Hecke category with a fixed monodromy under the torus action is monoidally equivalent to the mixed Hecke category of the corresponding endoscopic group $H$ with trivial monodromy. We also extend this equivalence to all blocks. We give two applications. One is a relationship between character sheaves on $G$ with a fixed semisimple parameter and unipotent character sheaves on the endoscopic group $H$, after passing to asymptotic versions. The other is a similar relationship between representations of…
Stringy Kähler moduli, mutation and monodromy
本文通过构造两类新的无限螺旋，首次刻画三维簇中不可约收缩曲线对应弦论Kähler模空间的导出单值群，并给出其在非交换形变、Gopakumar-Vafa不变量等方面的多项应用。
Normality of monodromy group in generic convolution group
本文证明在阿贝尔簇上，对不可数多个特征层，周回层族的单值群在一般纤维的 Tannakian 群中正规，并类比 Lawrence-Sawin 与 André 的正规性结果。
We show that some hypergeometric monodromy groups in Sp(4,Z) split as free or amalgamated products and hence by cohomological considerations give examples of Zariski dense, non-arithmetic monodromy groups of real rank 2. In particular, we show that the monodromy of the natural quotient of the Dwork family of quintic threefolds in P^{4} splits as Z*Z/5. As a consequence, for a smooth quintic threefold X we show that a certain group of autoequivalences of the bounded derived category of coherent sheaves is an Artin group of dihedral type.
We prove a global Torelli theorem for the moduli space of marked triples (X,m,A), consisting of an irreducible holomorphic symplectic manifold X, a marking m of its second integral cohomology, and a stable and rigid sheaf A of Azumaya algebras on the cartesian product X^d, d>0, such that the second Chern class of A is invariant under a finite index subgroup of the monodromy group of X. The main example involves the rank 2n-2 sheaf over the cartesian square of holomorphic symplectic manifolds of K3[n]-type considered in the work of the first author arXiv:1105.3223. The result will be used in th…
In the first three sections, we develop some basic facts about hypergeometric sheaves on the multiplicative group ${\mathbb G}_m$ in characteristic $p >0$. In the fourth and fifth sections, we specialize to quite special classses of hypergeomtric sheaves. We give relatively "simple" formulas for their trace functions, and a criterion for them to have finite monodromy. In the next section, we prove that three of them have finite monodromy groups.We then give some results on finite complex linear groups. We next use these group theoretic results to show that one of our local systems, of rank $24…
We explore some aspects of monodromies of D-branes in the Kahler moduli space of Calabi-Yau compactifications. Here a D-brane is viewed as an object of the derived category of coherent sheaves. We compute all the interesting monodromies in some nontrivial examples and link our work to recent results and conjectures concerning helices and mutations. We note some particular properties of the 0-brane.
We first develop some basic facts about hypergeometric sheaves on the multiplicative group ${\mathbb G}_m$ in characteristic $p >0$. Certain of their Kummer pullbacks extend to irreducible local systems on the affine line in characteristic $p>0$. One of these, of rank $23$ in characteristic $p=3$, turns out to have the Conway group $\mathrm{Co}_2$, in its irreducible orthogonal representation of degree $23$, as its arithmetic and geometric monodromy groups.
We define Frobenius and monodromy operators on the de Rham cohomology of $K$-dagger spaces (rigid spaces with overconvergent structure sheaves) with strictly semistable reduction $Y$, over a complete discrete valuation ring $K$ of mixed characteristic. For this we introduce log rigid cohomology and generalize the so called Hyodo-Kato isomorphism to versions for non-proper $Y$, for non-perfect residue fields, for non-integrally defined coefficients, and for the various strata of $Y$. We apply this to define and investigate crystalline structure elements on the de Rham cohomology of Drinfel'd's …
Let k be a field not of characteristic two and L be a set of almost all rational primes invertible in k. Suppose we have a variety X/k and strictly compatible system {M_ell -> X : ell in L} of constructible F_ell-sheaves. If the system is orthogonally or symplectically self-dual, then the geometric monodromy group of M_ell is a subgroup of a corresponding isometry group G_ell over F_ell, and we say it has big monodromy if it contains the derived subgroup DG_ell=[G_ell,G_ell]. We prove a theorem which gives sufficient conditions for M_ell to have big monodromy. We apply the theorem to explicit …
Equidistribution for Tannakian monodromy groups
本文通过 Tannakian 类别方法，证明了 Tannakian 单束群的等分布定理，并研究了指数和的分层以及相关消失定理。
Lagrangian structures on the derived moduli of constructible sheaves
本文研究了紧致定向流形上 $\mathcal{D}(k)$-valued 构造sheaves 和 perverse sheaves 的模形，证明其具有 $(2-n)$-移位的拉格朗日结构，并通过立方体的松散粘合结果实现。
We consider autoequivalences of the bounded derived category of coherent sheaves on a K3 surface. We prove that the image of the autoequivalences has index at most two in the group of the Hodge isometries of the Mukai lattice. Motivated by homological mirror symmetry we also consider the mirror counterpart, i.e. symplectic version of it. In the case of $ρ(X)=1$, we find an explicit formula which reproduces the number of Fourier-Mukai (FM) partners from the monodromy problem of the mirror K3 family. We present an explicit example in which a monodromy action does not come from an autoequivalence…
Virasoro constraints for K3 surfaces and monodromy operators
本研究利用Markman单值化算子证明K3曲面的Virasoro约束，将问题约化到秩1情形，同时证明秩0的新Virasoro约束，并引入负次数新型Virasoro算子，与已有算子共同构成中心荷为24的Virasoro代数表示。
Euler characteristics of the generalized Kloosterman sheaves for symplectic and orthogonal groups
本文研究了 Yun 构造的广义 Kloosterman 层相关局部系统的单值性，计算了其在辛群与正交群标准表示下的欧拉示性数，为 Reeder-Yu 关于 epipelagic 表示 Langlands 参数预测的 Swan 导子猜想提供了证据。
Mirror symmetry for the Painlevé character varieties
本文通过建立射影线上秩二（不规则）局部系统模空间作为4-流形的同调镜像定理，证明了具有一般微局部单值的Fukaya范畴等价于具有平凡微局部单值的对应模空间极小分解上的凝聚层范畴。
Let X be a smooth curve over a finite field of characteristic p, let E be a number field, and consider an E-compatible system of lisse sheaves on the curve X. For each place lambda of E not lying over p, the lambda-component of the system is a lisse E_lambda-sheaf on X, whose associated arithmetic monodromy group is an algebraic group over the local field E_lambda. We use Serre's theory of Frobenius tori and Lafforgue's proof of Deligne's conjecture to show that when the E-compatible system is semisimple and pure of some integer weight, the isomorphism type of the identity component of these m…
Convolution monodromy groups and the Shafarevich conjecture for hypersurfaces in tori
该研究针对环面$\boldsymbol{\rm{G}}_m^n$中固定牛顿多面体的非退化超曲面，借鉴Lawrence-Sawin的方法，通过构造正特征下反常层Tannakian范畴的纤维函子并计算Frobenius权，证明了特定类牛顿多面体对应的沙法列维奇猜想。
Slopes and weights of $\ell$-adic cohomology of rigid spaces
研究p进局部域上刚性空间的ℓ进上同调，证明其弗罗贝尼乌斯特征值是代数整数并给出p进赋值界，推导权重界证明相关猜想，还给出特定单值纯反常层例子回答问题。
Topology and geometry of moduli spaces of semistable sheaves on bielliptic surfaces
研究双椭圆曲面上半稳定层模空间的拓扑与低次霍奇理论，通过特定纤维化等方法构造满同态计算相关贝蒂数，扩展计算到正秩向量，证明\(H^2(F,\mathbb{C})\)性质，在一定条件下得出\(F\)的相关结论及\(M^\circ_{H,S}(\mathbf{v})\)的性质。
Superconnections, descent, and monodromy on transversely holomorphic foliations
本文针对横全纯叶状结构构造凝聚O_V模导出范畴的有限超联络模型，证明其与有界有限秩平坦V-超联络同伦范畴等价，还研究了下降性、单值群胚关联及全纯悬链相关性质。
Toroidal analogues of the Grothendieck-Springer map
本文通过研究轨道曲线上非交换直纹曲面导出范畴中对象的模空间，构造等变椭圆曲面上Hilbert概型双有理模型的形变，并应用于中心纤维的几何表示论，给出李代数作用及Namikawa-Markman Weyl群作用的公式。
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