Taro Sano
We survey recent construction of non-Kähler Calabi-Yau manifolds by smoothing SNC varieties obtained by non-trivial isomorphisms of strict Calabi-Yau manifolds. We also give a new example by smoothing an SNC 3-fold which are constructed from automorphisms of an abelian surface.
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We discuss Calabi-Yau and fractional Calabi-Yau semiorthogonal components of derived categories of coherent sheaves on smooth projective varieties. The main result is a general construction of a fractional Calabi-Yau category from a rectangular Lefschetz decomposition and a spherical functor. We give many examples of application of this construction and discuss some general properties of Calabi-Yau categories.
A note on the transcendental basepoint-free conjecture for Calabi-Yau manifolds
本文证明Calabi-Yau流形的超越无基点猜想在其Beauville-Bogomolov分解的超Kähler因子上成立时即成立，并利用Bakker-Lehn收缩定理在超Kähler流形上给出该猜想成立的一个充分条件。
Calabi--Yau threefolds with infinitely many divisorial contractions
我们研究了具有无穷多个整除收缩的Calabi-Yau 3-folds。我们还提出了用无限自同构群描述Calabi-Yau 3-折叠的方法。
We prove that the irreducible components of the moduli space of polarized Calabi-Yau pairs are projective.
Examples of Calabi-Yau 3-manifolds with complex multiplication
我们给出了具有复乘的Calabi-Yau三维流形的一些具体例子。
Polarized Calabi-Yau 3-folds in codimension 4
我们构造Calabi-Yau 3-folds作为嵌入在余维为4的加权射影空间中的orbifolds。对于每个实现的希尔伯特级数，至少有两个不同的卡-丘3-折叠分量。
We classify all smooth Calabi-Yau threefolds of Picard number two that have a general hypersurface Cox ring.
We construct examples of modular rigid Calabi--Yau threefolds, which give a realization of some new weight 4 cusp forms.
On the height of Calabi-Yau varieties in positive characteristic
研究了Calabi-Yau簇的正特征不变量，特别是Artin-Mazur形式群的高度不变量.我们用Fermat和Kummer型的Calabi-Yau簇来说明这些结果。
Geometric transitions between Calabi-Yau threefolds related to Kustin-Miller unprojections
我们研究Kustin-Miller非投影之间的卡-丘三倍或更精确的几何过渡，他们诱导。我们用它们来连接许多家庭的Calabi-Yau三倍皮卡德数1的网络的Calabi-Yau完全交叉。这使我们能够找到明确的描述几个已知的家庭卡-丘三倍的方程。此外，我们发现了两个新的例子，Calabi-Yau三重与皮卡德群的秩为一，描述的Pfidian方程的加权射影空间。
In this survey, we discuss the state of art about the monodromy property for Calabi-Yau varieties. We explain what is the monodromy property for Calabi-Yau varieties and then discuss some examples of Calabi-Yau varieties that satisfy this property. After this recap, we discuss a possible approach to future research in this area.
We develop some methods to construct normal crossing varieties whose dual complexes are two-dimensional, which are smoothable to Calabi--Yau threefolds. We calculate topological invariants of smoothed Calabi--Yau threefolds and show that several of them are new examples.
We prove the non-vanishing conjecture for lc pairs $(X,Δ)$ when $X$ is of Calabi--Yau type.
Notes on Calabi-Yau ordinary differential equations
本文研究了Calabi-Yau微分方程的结构以及方程背后的Calabi-Yau簇的簇与算法的关系。这为Samol和van Straten最近的一篇论文中的一些观察和计算提供了解释。
We determine the Griffiths-Yukawa coupling length of the Calabi-Yau universal families coming from hyperplane arrangements.
In this note, an overview of Calabi-Yau varieties in positive characteristic is presented. Although Calabi-Yau varieties in characteristic zero are unobstructed, there are examples of Calabi-Yau threefolds in positive characteristic which cannot be lifted to characteristic zero, although one-dimensional and two-dimensional Calabi-Yau varieties, i.e., elliptic curves and K3 surfaces, are all liftable to characteristic zero. In this respect, Calabi-Yau threefolds in positive characteristic are interesting in view of deformation theory and they are still very mysterious.
Correspondences between modular Calabi--Yau fiber products
本文描述了两种构造带截面有理椭圆曲面的纤维积与某些Calabi-Yau流形之间的有限有理态射的方法。我们用它们来构造这样的纤维积，承认最多五个奇异的纤维和刚性卡拉比-丘三倍之间的对应关系。
We show the boundedness of B-pluricanonical representations of lc log Calabi-Yau pairs in dimension $2$. As applications, we prove the boundedness of indices of slc log Calabi-Yau pairs up to dimension $3$ and that of non-klt lc log Calabi-Yau pairs in dimension $4$.
Motivated by the Bloch-Beilinson conjectures, Voisin has made a conjecture concerning the behaviour of zero-cycles on self-products of Calabi-Yau varieties. This note contains some examples of Calabi-Yau fourfolds verifying Voisin's conjecture.
Degenerations and mirror contractions of Calabi-Yau complete intersections via Batyrev-Borisov Mirror symmetry
我们表明，凯莱锥的对偶，与一个自反多面体的Minkowski和分解，包含一个自反多面体承认nef-分区。这种nef划分对应于Gorenstein Fano复曲面簇中的Calabi-Yau完全相交，退化为另一个Fano复曲面簇中的充足的Calabi-Yau超曲面。利用Batyrev-Borisov镜像对称构造，我们发现了一个Calabi-Yau完全交到一个丰富的Calabi-Yau超曲面的镜像的镜像收缩。
It is known that a maximal intersection log canonical Calabi-Yau surface pair is crepant birational to a toric pair. This does not hold in higher dimension: this paper presents some examples of maximal intersection Calabi-Yau pairs that admit no toric model.
In this paper, we will construct new examples of derived equivalent Calabi--Yau 3-folds with Picard number greater than one. We also study their mirror Calabi--Yau manifolds and find that they are given by Schoen's fiber products of suitable rational elliptic modular surfaces.
We prove derived equivalence of Calabi-Yau threefolds constructed by Ito-Miura-Okawa-Ueda as an example of non-birational Calabi-Yau varieties whose difference in the Grothendieck ring of varieties is annihilated by the affine line.
Calabi--Yau threefolds in $\mathbb{P}^6$
研究了复射影空间的$3$ -余维光滑子簇的几何性质。特别地，我们在射影$6$ -空间中对所有的拟Buchsbaum-Calabi-Yau进行了三重分类.此外，我们还证明了这个分类包含了可能奇异的5维二次曲面中的所有Calabi-Yau三重以及$\mathbb{P}^6$中的所有次数至多为$14$的Calabi-Yau三重.
We show that there exists a non-Kähler Calabi-Yau fourfold, constructing an example by smoothing a normal crossing variety.
Some ball quotients with a Calabi--Yau model
本文的目的是讨论Calabi-Yau簇的一个特殊例子，它表现为Picard模簇的一个小分解
Mirror Symmetry for Calabi-Yau complete intersections in Fano toric varieties
推广Batyrev和Borisov的自反多面体和nef划分的概念，我们提出了一个镜像对称的Fano复曲面簇中的Calabi-Yau完全相交。
This note is a report on the observation that the Enriques-Fano threefolds with terminal cyclic quotient singularities admit Calabi-Yau threefolds as their double coverings. We calculate the invariants of those Calabi-Yau threefolds when the Picard number is one. It turns out that all of them are new examples.
We present a list of arithmetically Gorenstein Calabi-Yau threefolds in $\mathbb{P}^7$ and give evidence that this is a complete list. In particular we construct three new families of arithmetically Gorenstein Calabi-Yau threefolds in $\mathbb{P}^7$ for which no mirror construction is known.
A cascade of determinantal Calabi--Yau threefolds
我们研究Kustin-Miller的卡拉比-丘三重非投影。作为应用，我们给出了定义为行列式簇的线性截面的Calabi-Yau三重的几何性质。我们计算他们的Hodge数和描述的态射对应于他们的Kähler-Mori锥的脸。
Sections of Calabi-Yau threefolds with K3 fibration
利用K3曲面研究了曲线上的Calabi-Yau三重纤维截面。我们证明了在某些K3纤维的Calabi-Yau三重上存在无穷多个孤立的截面，并且由这些截面生成的Néron-Severi群的子群不是单生成的.本文还给出了复曲线的函数域F上的K3曲面的例子，该曲线的函数域F上具有Zebraki稠密的F-有理点，其几何模型为Calabi-Yau。
We establish a global Torelli theorem for the complete family of Calabi-Yau threefolds arising from cyclic triple covers of $\mathbb P^3$ branched along stable hyperplane arrangements.
Algebraic characterization of differential operators of Calabi-Yau type
给出了具有极大幂单值点的Calabi-Yau流形族上的Picard-Fuchs算子的代数特征，并讨论了其微分伽罗瓦群的可能性.
In this note we construct conifold transitions between several Calabi-Yau threefolds given by Pfaffians in weighted projective spaces and Calabi-Yau threefolds appearing as complete intersections in toric varieties. We use the obtained results to predict mirrors following ideas of \cite{BCKS, Batsmalltoricdegen}. In particular we consider the family of Calabi--Yau threefolds of degree 25 in $\mathbb{P}^9$ obtained as a transverse intersection of two Grassmannians in their Plucker embeddings.
Calabi-Yau hypersurfaces in the direct product of $\mathbb{P}^{1}$ and inertia groups
我们构造了高维的$(\mathbb{P}^{1})^{n+1}$的Calabi-Yau超曲面族$X_{n}$，它的惯性群包含非交换的自由群.这与Takahashi关于$\mathbb{P}^{n+1}$的Calabi-Yau超曲面$M_{n}$的结果\cite{ta98}完全不同.
Boundedness of polarized log Calabi-Yau fibrations
该文研究带对数Calabi-Yau纤维化结构的对数对的有界性，证明在对数典范除子Iitaka体积有界、一般纤维属有界极化对数Calabi-Yau对族的条件下，纤维化全空间在crepant双有理等价下有界。
On autoequivalences of some Calabi--Yau and hyperkähler varieties
我们展示了如何通过从光滑的射影曲面到相关的Hilbert点方案来构造一些Calabi-Yau簇和hyperk“ahler簇的新的自等价。
We study the birational boundedness of special fibers of log Calabi-Yau fibrations and Fano fibrations. We show that for a locally stable family of Fano varieties or polarised log Calabi-Yau pairs over a curve, if the general fiber satisfies some natural boundedness conditions, then every irreducible component of the special fiber is birationally bounded.
Orbifold Riemann-Roch for threefolds with an application to Calabi-Yau geometry
本文证明了一个关于极化三重（X，D）的轨道Riemann-Roch公式.作为应用，我们构造了新的投射Calabi-Yau三重簇.
We study noncompact Calabi-Yau threefolds, their moduli spaces of vector bundles and deformation theory. We present Calabi-Yau threefolds that have infinitely many distinct deformations, constructing them explicitily, and describe the effect that such deformations produce on moduli spaces of vector bundles.
Based on recent work of Totaro, we provide two simple constructions of non-liftable Calabi-Yau varieties in characteristic $p \geq 5$. Our examples are of dimension $2p$ and $2p+1$.
Families of Calabi-Yau manifolds and mirror symmetry
本文从Calabi-Yau流形族与周期积分视角综述镜像对称，强调GKZ超几何级数的性质，并基于中心荷公式证明自反多胞形相关流形对的镜像对称，展示模空间全局描述带来的双有理几何与Fourier-Mukai配对例子。
In this note we prove the semiampleness conjecture for klt Calabi--Yau surface pairs over an excellent base ring. As applications we deduce that generalised abundance and Serrano's conjecture hold for surfaces. Finally, we study the semiampleness conjecture for Calabi--Yau threefolds over a mixed characteristic DVR.
Non-birational Calabi-Yau threefolds that are derived equivalent
我们认为，存在的高程度的多节的某些卡-丘三倍的属1纤维化意味着存在对这样的品种，不是双理性的，但派生等价。它也（可能）意味着存在的非双有理反例的Torelli问题的卡-丘三倍。
Extending the notion of Frobenius-splitting, we prove that every finite height Calabi-Yau variety defined over an algebraically closed field of positive characteristic can be lifted to the ring of Witt vectors of length two.
We write out explicit proper Calabi-Yau structures, i. e. non-degenerate cyclic cocycles on the differential graded categories of matrix factorizations of regular functions with isolated critical points. The formulas involve the Kapustin-Li trace and its "higher corrections".
We show some inductive statements for the index conjecture for log canonical Calabi-Yau pairs. Using it, we show that boundedness of log canonical index for log canonical Calabi Yau pairs with rational DCC coefficients in dimension 3. We also show boundedness of log canonical index for klt log Calabi-Yau pairs in dimension 4 with $B\neq 0$.
We show an example of non-simply connected non-liftable Calabi-Yau threefold over an algebraically closed field of characteristic $3$. It is constructed from a simply connected example by S.~Schröer.
Fano manifolds of Calabi-Yau type
引入并研究了一类奇维紧致复流形，其Hodge结构在中维上类似于Calabi-Yau三重流形.我们从具有特殊性质的有理齐性空间中构造了几个有趣的例子。
Toric Residue Mirror Conjecture for Calabi-Yau complete intersections
我们推广的环面剩余镜像猜想Batyrev和Materov不一定自反多面体。利用这一推广，我们证明了Gorenstein环面Fano簇的Calabi-Yau完全相交的环面剩余镜像猜想。
Calabi--Yau complete intersections in exceptional Grassmannians
本文分类了例外型李群格拉斯曼流形上能产生Calabi--Yau三维流形完全交的完全可约等变向量丛，并在$E_6$-格拉斯曼流形中发现了一族新的Calabi--Yau三维流形。
Derived equivalences of Calabi-Yau fibrations
我们认为纤维化的阿贝尔表面和K3表面上的一维基地，是Calabi-Yau和我们得到的对偶纤维化的衍生等价于原来的纤维化。最后，我们把这个问题与镜像对称联系起来。
5-th order differential equations related to Calabi-Yau differential equations
列出了极少数以四阶Calabi-Yau方程为拉回的五阶微分方程。我们使用杨一凡的回调，在大多数情况下，回调的程度比通常的回调要低得多。
Calabi-Yau complete intersections with infinitely many lines
本文给出了类元含有无穷多条直线的Calabi-Yau三重完全交族的两个新例子。我们得到了这些线的法丛和三重线的Hilbert格式的一些结果。
Based on Cynk-Hulek method we construct complex Calabi-Yau varieties of arbitrary dimensions using elliptic curves with automorphism of order 6. Also we give formulas for Hodge numbers of varieties obtained from that construction. We shall generalize result of Katsura and Schütt to obtain arbitrarily dimensional Calabi-Yau manifolds which are Zariski in any characteristic $p\not\equiv 1\pmod{12}.$
Smooth finite abelian uniformizations of projective spaces and Calabi-Yau Orbifolds
给出了具有有限阿贝尔群作用的光滑复流形的一个分类，使得其商同构于一个射影空间。详细研究了流形是卡-丘流形的情形。
A Calabi-Yau threefold with Brauer group (Z/8Z)^2
本文计算了Mark Gross和Sorin Popescu发现的某个Calabi-Yau三重的Brauer群，它是由64个普通二重点构成的（2，2，2，2）型完全交的小分解.我们发现布劳尔群是（Z/8 Z）^2，这是已知的卡-丘三重布劳尔群的最大例子。
Graded 3-Calabi-Yau algebras as Ore extensions of 2-Calabi-Yau algebras
研究了一类由2维分次Calabi-Yau代数的Ore扩张得到的分次代数。证明了这些代数是分次Calabi-Yau代数和分次凝聚代数。构造了与这些分次Calabi-Yau代数相关的超势。
How to tell you're hearing a Calabi-Yau: Universal variations of Hodge structure and local Schottky relations for Calabi-Yau manifolds
一个修订本，有一些更正和改进。
Calabi-Yau coverings over some singular varieties and new Calabi-Yau 3-folds with Picard number one
本文是关于某些奇异簇容许Calabi-Yau覆盖的观察的报告。作为应用，我们构造了18个新的Picard数为1的Calabi-Yau 3-折叠，它们具有一些有趣的性质.
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