Lev Borisov, Anatoly Libgober
We establish the equality of stringy $E$-functions for double mirror Calabi-Yau complete intersections in the varieties of skew forms of rank at most $2k$ and at most $n-1-2k$ on a vector space of odd dimension $n$.
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Stringy Hodge numbers of Pfaffian double mirrors and Homological Projective Duality
本文通过引入修正版弦论E-函数，研究Pfaffian双重镜像的弦论Hodge数，推广Borisov-Libgober结果，并对Pfaffian簇的范畴crepant消解的Lefschetz分解给出数值预测。
We consider the Pfaffian-Grassmannian equivalence from the motivic point of view. The main result is that under certain numerical conditions, both sides of the equivalence are related on the level of Chow motives. The consequences include a verification of Orlov's conjecture for Borisov's Calabi-Yau threefolds, and verifications of Kimura's finite-dimensionality conjecture, Voevodsky's smash conjecture and the Hodge conjecture for certain linear sections of Grassmannians. We also obtain new examples of Fano varieties with infinite-dimensional Griffiths group.
The Pfaffian-Grassmannian derived equivalence
我们证明了Grassmannian G（2，7）和Pfangian Pf（7）的对偶超平面截面（适当余维）所得到的Calabi-Yau三重性之间存在一个导出等价性.这种等价性的存在已经被物理学家证明了近十年，因为两个卡-丘三重族被认为具有相同的镜像。这是第一个例子之间的推导等价卡-丘三倍这是可证明的非双有理。
The Pfaffian-Grassmannian correspondence relates certain pairs of derived equivalent non-birational Calabi-Yau 3-folds. Given such a pair, I construct a set of derived equivalences corresponding to mutations of an exceptional collection on the relevant Grassmannian, and give a mirror symmetry interpretation, following a physical analysis of Eager, Hori, Knapp, and Romo.
A note on affine cones over Grassmannians and their stringy $E$-functions
本文计算了 Grassmannian 上仿射锥的 stringy $E$-function，发现即使不容许 crepant resolution，该函数有时为多项式且对应存在非交换 crepant resolution，进而探讨了两者之间的潜在蕴含关系。
Homological projective duality for Grassmannians of lines
我们证明了Grassmannian簇Gr（2，6）和Gr（2，7）的同调投射对偶簇是由相应Pfavian簇的奇点的某些非交换分解给出的。作为一个应用，我们描述了这些格拉斯曼和普法尔茨的线性部分的导出范畴。特别地，我们证明了：（1）Pfiran三次4-重簇的导出范畴和K3-曲面的导出范畴都有一个由3个例外线丛组成的半正交分解;（2）Gr（2，7）的相互正交的Calabi-Yau线性截面和相应Pfiran簇的相互正交的Calabi-Yau线性截面是等价的.我们还根据三次4重的导出范畴推测了其合理性准则。
The Pfaffian Calabi-Yau, its Mirror, and their link to the Grassmannian G(2,7)
一般反对称7 × 7矩阵的秩为4的轨迹给出了P^20中的pf的一个变种，它不是定义为完全相交。将它与一般的P^6相交，得到一个卡-丘流形。一个轨道结构似乎给出了这个的单参数镜像族。然而，对应于复结构的单参数族中的两个点，它们都具有最大单值性，是两个不同的镜像映射：一个对应于一般的pf f f截面，另一个对应于G（2，7）在P^20中与P^13的一般交集。显然，Pfronan截面和G（2，7）截面构成了A模型（Kahler结构相关）模空间的不同部分，因此代表了同一共形域论模空间的不同部分。
Higher genus Gromov-Witten invariants of the Grassmannian, and the Pfaffian Calabi-Yau threefolds
通过求解Bershadsky-Cecotti-Ooguri-Vafa（BCOV）全纯反常方程，确定了等价的Calabi-Yau三重的高阶亏格Gromov-Witten不变量（$g \leq 5$），它们在Grassmannian Gr（2，7）和Pfangerian Pf（7）中具有适当的余维.
We prove a Pfaffain formula for the $K$-theory class of the degeneracy loci in the bundle of odd maximal orthogonal Grassmannians.
We give a new proof of the 'Pfaffian-Grassmannian' derived equivalence between certain pairs of non-birational Calabi-Yau threefolds. Our proof follows the physical constructions of Hori and Tong, and we factor the equivalence into three steps by passing through some intermediate categories of (global) matrix factorizations. The first step is global Knoerrer periodicity, the second comes from a birational map between Landau-Ginzburg B-models, and for the third we develop some new techniques.
We resolve a conjecture about a class of binomial initial ideals of $I_{2,n}$, the ideal of the Grassmannian, Gr$(2,\mathbb{C}^n$), which are associated to phylogenetic trees. For a weight vector $ω$ in the tropical Grassmannian, $in_ω(I_{2,n}) = J_\mathcal{T}$ is the ideal associated to the tree $\mathcal{T}$. The ideal generated by the $2r \times 2r$ subpfaffians of a generic $n \times n$ skew-symmetric matrix is precisely $I_{2,n}^{\{r-1\}}$, the $(r-1)$-secant of $I_{2,n}$. We prove necessary and sufficient conditions on the topology of $\mathcal{T}$ in order for $in_ω(I_{2,n})^{\{2\}} = J…
We study the torus equivariant Schubert classes of the Grassmannian of non-maximal isotropic subspaces in a symplectic vector space. We prove a formula that expresses each of those classes as a sum of multi Schur-Pfaffians, whose entries are equivariantly modified special Schubert classes. Our result gives a proof to Wilson's conjectural formula, which generalizes the Giambelli formula for the ordinary cohomology proved by Buch-Kresch-Tamvakis, given in terms of Young's raising operators. Furthermore we show that the formula extends to a certain family of Schubert classes of the symplectic par…
In this paper we give gauged linear sigma model (GLSM) realizations of a number of geometries not previously presented in GLSMs. We begin by describing GLSM realizations of maps including Veronese and Segre embeddings, which can be applied to give GLSMs explicitly describing constructions such as the intersection of one hypersurface with the image under some map of another. We also discuss GLSMs for intersections of Grassmannians and Pfaffians with one another, and with their images under various maps, which sometimes form exotic constructions of Calabi-Yaus, as well as GLSMs for other exotic …
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.
On Stringy E-functions and the Non-negativity Conjecture for Determinantal Varieties
本文计算了行列式簇的stringy E-函数，证明其与Grassmannian和仿射空间乘积的E-函数一致，并据此验证了stringy Hodge数的非负性猜想。
On Fano varieties of index one that are linear sections of Grassmannians of lines
本文研究线Grassmannian的一般线性截面Fano簇，证明其双有理等价于由pfaffian行列式定义的超曲面，并给出相应超曲面的有理参数化。
This work is motivated by the relation between the KP and BKP integrable hierarchies, whose $τ$-functions may be viewed as sections of dual determinantal and Pfaffian line bundles over infinite dimensional Grassmannians. In finite dimensions, we show how to relate the Cartan map which, for a vector space $V$ of dimension $N$, embeds the Grassmannian ${\mathrm {Gr}}^0_V(V+V^*)$ of maximal isotropic subspaces of $V+ V^*$, with respect to the natural scalar product, into the projectivization of the exterior space $Λ(V)$, and the Plücker map, which embeds the Grassmannian ${\mathrm {Gr}}_V(V+ V^*)…
Stable equivariant birationalities of cubic and degree 14 Fano threefolds
本研究提出Pfaffian-Grassmannian对应的等变版本，以此构造出三次三维簇与14次Fano三维簇间非平凡的扭稳定等变双有理等价实例，为等变双有理几何提供新案例。
We study the double Grothendieck polynomials of Kirillov--Naruse for the symplectic and odd orthogonal Grassmannians. These functions are explicitly written as sums of Pfaffian and are identified with the stable limits of the fundamental classes of Schubert varieties in the torus equivariant connective K-theory of these isotropic Grassmannians. We also provide a combinatorial description of the ring formally spanned by double Grothendieck polynomials.
On Calabi-Yau varieties that are linear sections of Grassmannians of lines
本文研究奇数n≥5时直线格拉斯曼流形的线性截面卡拉比-丘流形，证明相关Pfaffian超曲面有理并给出双有理参数化，还研究了对应直线同余。
Hilbert functions of points on Schubert varieties in Orthogonal Grassmannians
给出了以下问题的解决方案：如何计算在正交格拉斯曼中的舒伯特簇上的点处的重数，或更一般地计算希尔伯特函数。应用标准单项式理论将问题从几何转化为组合数学。由此产生的组合问题的解决方案形成了大部分的文件。这种方法已经遵循早先解决同样的问题的格拉斯曼和辛格拉斯曼。作为一个应用，我们提出了一个解释的多重性的数量不相交的格子路径的某种。以舒伯特簇是一种特殊的类型和点是“单位陪集”，我们的问题专门的问题Pfedian理想治疗的不同方法存在于文献中。在文献中也可得到当点是“一般奇点”时的几何解。"
We propose Picard-Fuchs equations for periods of nonabelian mirrors in this paper. The number of parameters in our Picard-Fuchs equations is the rank of the gauge group of the nonabelian GLSM, which is eventually reduced to the actual number of Kähler parameters. These Picard-Fuchs equations are concise and novel. We justify our proposal by reproducing existing mathematical results, namely Picard-Fuchs equations of Grassmannians and Calabi-Yau manifolds as complete intersections in Grassmannians. Furthermore, our approach can be applied to other nonabelian GLSMs, so we compute Picard-Fuchs equ…
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