Tom Bridgeland, Antony Maciocia
We study Fourier-Mukai transforms for smooth projective varieties whose canonical bundles have finite order, and relate them to equivariant transforms on certain finite covering spaces. Our results lead to new equivalences of derived categories for Enriques and bielliptic surfaces.
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This note is an answer to a problem proposed by Ranestad and Iliev. We prove that the projection of general nodal linear sections of suitable dimension of the Mukai varieties $M_g$ are linear sections of $M_{g-1}$.
We construct an explicit complex smooth Fano threefold with Picard number 1, index 1, and degree 10 (also known as a Gushel-Mukai threefold) and prove that it is not rational by showing that its intermediate Jacobian has a faithful $\mathrm{PSL}(2,\mathbf{F}_{11}) $-action. Along the way, we construct Gushel-Mukai varieties of various dimensions with rather large (finite) automorphism groups. The starting point of all these constructions is an Eisenbud-Popescu-Walter sextic with a faithful $\mathrm{PSL}(2,\mathbf{F}_{11}) $-action discovered by the second author in 2013.
We describe the moduli stack of Gushel-Mukai varieties as a global quotient stack and its coarse moduli space as the corresponding GIT quotient. The construction is based on a comprehensive study of the relation between this stack and the stack of Lagrangian data; roughly speaking, we show that the former is a generalized root stack of the latter. As an application, we define the period map for Gushel-Mukai varieties and construct some complete nonisotrivial families of smooth Gushel-Mukai varieties. In an appendix, we describe a generalization of the root stack construction used in our approa…
We perform a systematic study of Gushel-Mukai varieties---quadratic sections of linear sections of cones over the Grassmannian Gr(2,5). This class of varieties includes Clifford general curves of genus 6, Brill-Noether general polarized K3 surfaces of genus 6, prime Fano threefolds of genus 6, and their higher-dimensional analogues. We establish an intrinsic characterization of normal Gushel-Mukai varieties in terms of their excess conormal sheaves, which leads to a new proof of the classification theorem of Gushel and Mukai. We give a description of isomorphism classes of Gushel-Mukai varieti…
Mukai models of Fano varieties
本文给出了Mukai关于指标1且亏格$g \ge 6$的素Fano三维簇分类及其高维推广的自包含简化证明。
We study the Fourier-Mukai functor D(Y) -> D(X) induced by the universal family on a fine moduli space Y for simple semihomogeneous vector bundles on an abelian variety X. The main result is that the Fourier-Mukai transform of a very negative line bundle on Y is ample if and only if the bundles parametrized by Y are nef.
Mukai varieties are Fano varieties of Picard number one and coindex three. In genus seven to ten they are linear sections of some special homogeneous varieties. We describe the generic automorphism groups of these varieties. When they are expected to be trivial for dimensional reasons, we show they are indeed trivial, up to three interesting and unexpected exceptions in genera 7, 8, 9, and codimension 4, 3, 2 respectively. We conclude in particular that a generic prime Fano threefold of genus g has no automorphisms for 7 $\le$ g $\le$ 10. In the Appendix by Y. Prokhorov, the latter statement i…
Stability conditions and moduli spaces for Kuznetsov components of Gushel-Mukai varieties
本文证明了Gushel-Mukai簇Kuznetsov分量上Bridgeland稳定性条件的存在性，描述了偶数维情形下的模空间结构，并据此构造了K3型超凯勒簇的新无限系列族及Hodge理论等价判据。
The generalised Mukai conjecture for spherical varieties
本文证明了广义Mukai猜想在有理数因子球面Fano变种中的成立，并引入了衡量Fano变种接近典范程度的最小绝对复杂度项。
Gushel-Mukai varieties
本文综述了Gushel-Mukai簇的几何、模空间、Hodge结构和范畴性质，基于与Kuznetsov的合作及前人研究。
We associate to any complete spherical variety $X$ a certain nonnegative rational number $\wp(X)$, which we conjecture to satisfy the inequality $\wp(X) \le \operatorname{dim} X - \operatorname{rank} X$ with equality holding if and only if $X$ is isomorphic to a toric variety. We show that, for spherical varieties, our conjecture implies the generalized Mukai conjecture on the pseudo-index of smooth Fano varieties due to Bonavero, Casagrande, Debarre, and Druel. We also deduce from our conjecture a smoothness criterion for spherical varieties. It follows from the work of Pasquier that our conj…
Let X be a Fano variety of dimension n, pseudoindex i_X and Picard number ρ_X. A generalization of a conjecture of Mukai says that ρ_X(i_X-1)\le n. We prove that the conjecture holds if: a) X has pseudoindex i_X \ge \frac{n+3}{3} and either has a fiber type extremal contraction or does not have small extremal contractions b) X has dimension five.
Derived categories of generalized Kummer varieties: extended Mukai vector
本文利用扩展 Mukai 向量研究广义 Kummer 型超 Kähler 流形的导出等价，构造并证明了一个在导出等价下不变的整格，并以导出单值群阐述其应用。
We discuss birational properties of Mukai varieties, i.e., of higher-dimensional analogues of prime Fano threefolds of genus $g \in \{7,8,9,10\}$ over an arbitrary field $\mathsf{k}$ of zero characteristic. In the case of dimension $n \ge 4$ we prove that these varieties are $\mathsf{k}$-rational if and only if they have a $\mathsf{k}$-point except for the case of genus $9$, where we assume $n \ge 5$. Furthermore, we prove that Mukai varieties of genus $g \in \{7,8,9,10\}$ and dimension $n \ge 5$ contain cylinders if they have a $\mathsf{k}$-point. Finally, we prove that the embedding $X \hook…
We study the derived categories of coherent sheaves on Gushel-Mukai varieties. In the derived category of such a variety, we isolate a special semiorthogonal component, which is a K3 or Enriques category according to whether the dimension of the variety is even or odd. We analyze the basic properties of this category using Hochschild homology, Hochschild cohomology, and the Grothendieck group. We study the K3 category of a Gushel-Mukai fourfold in more detail. Namely, we show that this category is equivalent to the derived category of a K3 surface for a certain codimension 1 family of rational…
We will discuss the Fourier-Mukai partners of a given abelian variety. The first part of the note is to give some basic theory of Fourier-Mukai partners and semi-homogenous vector bundles, then we will discuss the case when the kernel of an equivalence is given by a semi-homogenous vector bundle. In particular, given an abelian variety B, and a simple semi-homogenous vector bundle E on B, we will discuss for which E, it can be the image of the structure sheaf of the unit on A under some triangulated equivalence, where A is some abelian variety.
Gushel--Mukai varieties: intermediate Jacobians
该研究刻画了三维与五维Gushel-Mukai簇的中间雅可比簇，证明其同构于关联对偶Eisenbud-Popescu-Walter曲面典范双重覆盖的Albanese簇，并给出了对应簇周期映射的刻画。
A Mukai variety is a Fano n-fold of index n-2. In this paper we study the fundamental divisor of a Mukai variety with at worst log terminal singularities. The main result is a complete classification of log terminal Mukai varieties which have not good divisors, examples of "bad" varieties are given. In such a way we also give a shorter proof of Mukai Conjecture, solved in our previous paper alg-geom/9611024.
Quadrics on Gushel-Mukai varieties
本文通过将光滑 Gushel-Mukai 簇上的二次超曲面 Hilbert 概型关联到 P^5 点爆破上相关二次超曲面族的线性子空间相对 Hilbert 概型，系统研究了维数 k∈{0,1,2,3} 的二次超曲面分类问题。
This article is based on a talk given at the Kinosaki Symposium on Algebraic Geometry in 2015, about a work in progress. We describe a polarization on a derived equivalent abelian variety by using Fourier-Mukai theory. We explicitly formulate a conjecture which says certain Fourier-Mukai transforms between derived categories give equivalences of some hearts of Bridgeland stability conditions. We establish it for abelian surfaces, which is already known due to D. Huybrechts, and for abelian 3-folds. This generalizes the author's previous joint work with A. Maciocia on principally polarized abel…
We compute the Chow groups of smooth Gushel-Mukai varieties of dimension $5$.
Proper Fourier-Mukai partners of abelian varieties and points outside the Fourier-Mukai loci in Matsui spectra
本文通过分析导出范畴的 Matsui 谱，证明了阿贝尔簇的真正 Fourier-Mukai 伙伴仍为阿贝尔簇，并将结果扩展至正常概形；同时揭示了 Fourier-Mukai 轨迹之外的几何结构，为 Ito 猜想提供了基于高维简单阿贝尔簇的新反例。
Algebraic cycles on Gushel-Mukai varieties
研究复 Gushel-Mukai (GM) 簇上的代数环，证明了广义 Hodge 猜想、(动机) Mumford-Tate 猜想和广义 Tate 猜想，计算了除两个无限维情形外的所有积分 Chow 群，并证明了广义伙伴或广义对偶的 GM 簇在中度有理 Chow 动机上同构。
On Mukai's conjecture for hyperelliptic varieties
本文研究数值平凡典范线丛的光滑射影簇的合冲性质，证明了一般性结果，并在任意维数和正特征下验证了阿贝尔簇有限商的Mukai合冲猜想若干情形。
A note on Fourier-Mukai partners of abelian varieties over positive characteristic fields
本文研究正特征域上阿贝尔簇的Fourier-Mukai伙伴，将Krug-Sosna关于Kummer栈的导出等价结果推广到奇特征情形，证明阿贝尔曲面导出等价与Kummer曲面同构等价，并建立超奇异阿贝尔簇的导出Torelli定理。
We study the Fourier-Mukai transform for holonomic D-modules on complex abelian varieties. Among other things, we show that the cohomology support loci of a holonomic D-module are finite unions of linear subvarieties, which go through points of finite order for objects of geometric origin; that the standard t-structure on the derived category of holonomic complexes corresponds, under the Fourier-Mukai transform, to a certain perverse coherent t-structure in the sense of Kashiwara and Arinkin-Bezrukavnikov; and that Fourier-Mukai transforms of simple holonomic D-modules are intersection complex…
Beauville and Donagi proved in 1985 that the primitive middle cohomology of a smooth complex cubic fourfold and the primitive second cohomology of its variety of lines, a smooth hyperkähler fourfold, are isomorphic as polarized integral Hodge structures. We prove analogous statements for smooth complex Gushel-Mukai varieties of dimension 4 (resp. 6), i.e., smooth dimensionally transverse intersections of the cone over the Grassmannian Gr(2,5), a quadric, and two hyperplanes (resp. of the cone over Gr(2,5) and a quadric). The associated hyperkähler fourfold is in both cases a smooth double cove…
On the deformation theory of Fourier-Mukai transforms between Calabi-Yau varieties
本文研究特征零与混合特征下全忠实 Fourier-Mukai 变换的形变理论，证明源簇具平凡典范丛时形变阻碍可由 Hodge 理论完全控制，推广已有结果并给出阻碍类的上积公式。
The generalized Mukai conjecture for spherical varieties with a reductive general isotropy group
本文研究具有约化一般迷向群的球面簇，证明了Gagliardi–Hofscheier猜想，并由此推出此类簇上的广义Mukai猜想。
I give three descriptions of the Mukai flop of type $E\_{6,I}$, one in terms of Jordan algebras, one in terms of projective geometry over the octonions, and one in terms of O-blow-ups. Each description shows that it is very similar to certain flops of type $A$. The Mukai flop of type $E\_{6,II}$ is also described.
Fourier-Mukai partners of abelian varieties and K3 surfaces in positive and mixed characteristics
本文研究了在正特征和混合特征下阿贝尔簇和K3曲面的傅里叶-穆卡伊伙伴，证明了其提升性质并恢复了原有结果。
Due to a theorem by Orlov every exact fully faithful functor between the bounded derived categories of coherent sheaves on smooth projective varieties is of Fourier-Mukai type. We extend this result to the case of bounded derived categories of twisted coherent sheaves and at the same time we weaken the hypotheses on the functor. As an application we get a complete description of the exact functors between the abelian categories of twisted coherent sheaves on smooth projective varieties.
We provide a stable rationality construction for some smooth complex Gushel-Mukai varieties of dimension 6. As a consequence, we compute the integral singular cohomology of any smooth Gushel-Mukai sixfold and in particular, show that it is torsion-free.
Given a Fourier-Mukai transform $Φ$ between the bounded derived categories of two smooth projective curves, we verifiy that the induced map between the Jacobian varieties preserves the principal polarization if and only if $Φ$ is an equivalence.
We introduce the notion of Mukai regularity (M-regularity) for coherent sheaves on abelian varieties. The definition is based on the Fourier-Mukai transform, and in a special case depending on the choice of a polarization it parallels and strenghtens the usual Castelnuovo-Mumford regularity. Mukai regularity has a large number of applications, ranging from basic properties of linear series on abelian varieties and defining equations for their subvarieties, to higher dimensional type statements and to a study of special classes of vector bundles. Some of these applications are explained here, w…
Arithmetic finiteness of Mukai varieties of genus 7
该研究针对亏格7的素Fano三维簇及高维Mukai簇的算术有限性展开，得到Torelli定理的算术精细化、Shafarevich型有限性的维数差异结果，并明确了定义在整数环上的这类簇的存在维数范围。
Effective non-vanishing and Mukai type conjecture
本文引入Fano簇的不变量，提出刻画射影空间乘积的Mukai型猜想，并证明Ambro-Kawamata有效非消失性猜想蕴含该猜想。
The Tate Conjecture for even dimensional Gushel-Mukai varieties in characteristic $p\geq 5$
本文研究了特征 $p$ 下维数为 4 和 6 的 Gushel-Mukai 簇，通过借鉴 K3 曲面的证明方法、利用广义伙伴概念及特征 0 下的 Chow 动机同构，证明了特征 $p\geq 5$ 下的 Tate 猜想。
This paper surveys some recent results about Fourier--Mukai functors. In particular, given an exact functor between the bounded derived categories of coherent sheaves on two smooth projective varieties, we deal with the question whether this functor is of Fourier--Mukai type. Several related questions are answered and many open problems are stated.
The paper sets out a generalized framework for Fourier-Mukai transforms and illustrates their use via vector bundle transforms. A Fourier-Mukai transform is, roughly, an isomorphism of derived categories of (sheaves) on smooth varieties X and Y. We show that these can only exist if the first Chern class of the varieties vanishes and, in the case of vector bundle transforms, will exist if and only if there is a bi-universal bundle on XxY which is "strongly simple" in a suitable sense. Some applications are given to abelian varieties extending the work of Mukai.
Orlov's famous representability theorem asserts that any fully faithful exact functor between the bounded derived categories of coherent sheaves on smooth projective varieties is a Fourier-Mukai functor. In this paper we show that this result is false without the full faithfulness hypothesis.
We propose a slightly modified definition for the Fourier-Mukai transform (on abelian varieties) that makes it much easier to remember various formulas. As an application, we give relatively short proofs for two important theorems: the characterization of GV-sheaves in terms of vanishing, due to Hacon; and fact that M-regularity implies (continuous) global generation, due to Pareschi and Popa.
We use A_{infinity}-formalism to study variation of cohomology spaces under formal deformations of coherent sheaves on projective varieties. As an application we describe formal neighborhoods of twisted Brill-Noether loci at some points. Another application is a computation of the Fourier-Mukai transform of some natural line bundles on symmetric powers of a curve.
The Mukai conjecture via Cox rings for smooth canonical ambient embeddings
本文通过Cox环理论研究特殊典范嵌入下的Fano簇，证明了Mukai猜想在局部因子Fano簇中的成立，基于Mori梦想空间的log版本。
Let $X$ and $Y$ be smooth projective varieties over $\C$. We say that $X$ and $Y$ are \emph{D-equivalent} (or, $X$ is a \emph{Fourier--Mukai partner} of $Y$) if their derived categories of bounded complexes of coherent sheaves are equivalent as triangulated categories. The aim of this short note is to find an example of mutually D-equivalent but not isomorphic relatively minimal elliptic surfaces.
Fourier-Mukai transform for fine compactified Prym varieties
本文针对由平面奇异谱曲线定义的紧化 Prym 簇构造 Fourier–Mukai 变换，建立其与等变导出范畴的等价，从而得到稠密一类奇异谱曲线上 SL(n,C) 与 PGL(n,C) Hitchin 纤维的导出等价。
This is a survey of M-regularity for coherent sheaves on abelian varieties and its applications, based on lectures given by the second author at the Seattle conference, in August 2005, and at the Luminy GAC workshop in October 2005. Section 3 contains some brief indications of upcoming work.
We study the Fourier-Mukai transform for holonomic D-modules on a complex abelian variety. Among other things, we show that the cohomology support loci of a holonomic complex are finite unions of translates of triple tori, the translates being by torsion points for objects of geometric origin; and that the standard t-structure on the derived category of holonomic complexes corresponds, under the Fourier-Mukai transform, to a certain perverse coherent t-structure in the sense of Kashiwara and Arinkin-Bezrukavnikov.
Categorical resolutions and birational geometry of nodal Gushel-Mukai varieties
本文研究带孤立节点的Gushel-Mukai簇的双有理几何与导出范畴，通过flop建立Kuznetsov分量的分类消解与二次曲面纤维化的Clifford代数模范畴之间的等价，并应用于有理性和双有理模型构造。
Fourier--Mukai transforms commuting with Frobenius
本文证明了特征 $p$ 光滑射影簇间与 Frobenius 前推或拉回交换的 Fourier--Mukai 等价，可分解为平移、同构及与特定可逆层张量积的复合。
In this paper, we discuss the problem of whether the difference $[X]-[Y]$ of the classes of a Fourier--Mukai pair $(X, Y)$ of smooth projective varieties in the Grothendieck ring of varieties is annihilated by some power of the class $\mathbb{L} = [ \mathbb{A}^1 ]$ of the affine line. We give an affirmative answer for Fourier--Mukai pairs of very general K3 surfaces of degree 12. On the other hand, we prove that in each dimension greater than one, there exists an abelian variety such that the difference with its dual is not annihilated by any power of $\mathbb{L}$, thereby giving a negative an…
We study the intersection theory of complex Lagrangian subvarieties inside holomorphic symplectic manifolds. In particular, we study their behaviour under Mukai flops and give a rigorous proof of the Plücker type formula for Legendre dual subvarieties written down by the second author before. Then we apply the formula to study projective dual varieties in projective spaces.
We prove that the canonical cover of an Enriques surface does not admit non-trivial Fourier-Mukai partners. We also show that the canonical cover of a bielliptic surface has at most one non-isomorphic Fourier-Mukai partner. The first result is then applied to birational Hilbert schemes of points and the second to birational generalised Kummer varieties. An appendix establishes that there are no exceptional or spherical objects in the derived category of a bielliptic surface.
Fourier-Mukai partners of non-syzygetic cubic fourfolds and Gale duality
本文研究非合冲三次四维簇，证明其恰有一个非平凡Fourier-Mukai伙伴，利用Gale对偶关联该伙伴，还构造相关反例探讨双有理性猜想。
We investigate a construction providing pairs of Calabi-Yau varieties described as zero loci of pushforwards of a hyperplane section on a roof as described by Kanemitsu. We discuss the implications of such construction at the level of Hodge equivalence, derived equivalence and $\mathbb L$-equivalence. For the case of $K3$ surfaces, we provide alternative interpretations for the Fourier-Mukai duality in the family of $K3$ surfaces of degree 12 of Mukai. In all these constructions the derived equivalence lifts to an equivalence of matrix factorizations categories.
Countability of relative Fourier-Mukai partners
本文将 Fourier-Mukai 伙伴的可数性结果从代数闭域上的光滑真代数簇推广到诺特基概形上的光滑真概形，证明其相对 Fourier-Mukai 伙伴在同构意义下至多可数。
Double EPW sextics associated to Gushel-Mukai surfaces
本文刻画了相伴双EPW六次超曲面光滑的K3曲面，并由此在某些光滑双EPW六次超曲面上构造辛作用，同时给出Gushel-Mukai簇自同构群的界。
A theorem by Orlov states that any equivalence between the bounded derived categories of coherent sheaves of two smooth projective varieties, X and Y, is isomorphic to a Fourier-Mukai transform with kernel in the bounded derived category of coherent sheaves of the product XxY. In the case of an exact functor which is not necessarily fully faithful, we compute some sheaves that play the role of the cohomology sheaves of the kernel, and that are isomorphic to the latter whenever an isomorphism to a Fourier-Mukai transform exists. We then exhibit a class of functors that are not full or faithful …
A $K$-equivalent map between two smooth projective varieties is called simple if the map is resolved in both sides by single smooth blow-ups. In this paper, we will provide a structure theorem of simple $K$-equivalent maps, which reduces the study of such maps to that of special Fano manifolds. As applications of the structure theorem, we provide examples of simple $K$-equivalent maps, and classify such maps in several cases, including the case of dimension at most $8$.
Orlov's famous representability theorem asserts that any fully faithful functor between the derived categories of coherent sheaves on smooth projective varieties is a Fourier-Mukai functor. This result has been extended by Lunts and Orlov to include functors from perfect complexes to quasi-coherent complexes. In this paper we show that the latter extension is false without the full faithfulness hypothesis. Our results are based on the properties of scalar extensions of derived categories, whose investigation was started by Pawel Sosna and the first author.
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