Jaroslaw Buczynski
We give the full classification of smooth toric Legendrian subvarieties in projective space. We also prove that under some minor assumptions the group of linear automorphisms preserving given Legendrian subvariety preserves the contact structure of the ambient projective space.
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We prove that a general hyperplane section of a smooth Legendrian subvariety in a projective space admits Legendrian embedding into another projective space. This gives numerous new examples of smooth Legendrian subvarieties, some of which have positive Kodaira dimension.
I prove that every smooth legendrian variety generated by quadrics is a homogeneous variety and further I give a list of all such legendrian varieties. A review of the subject is included, illustrated by examples. Another result is that no complete intersection is a legendrian variety.
Real Legendrian subvarieties are classical objects of differential geometry and classical mechanics and they have been studied since antiquity. However, complex Legendrian subvarieties are much more rigid and have more exceptional properties. The most remarkable case is the Legendrian subvarieties of projective space and prior to the author's research only few smooth examples of these were known. The first series of results of this thesis is related to the automorphism group of any Legendrian subvariety in any projective contact manifold. The connected component of this group (under suitable m…
We study the tropicalizations of analytic subvarieties of normal toric varieties over complete non-archimedean valuation fields. We show that a Zariski closed analytic subvariety of a normal toric variety is algebraic if its tropicalization is a finite union of polyhedra. Previously, the converse direction was known by the theorem of Bieri and Groves. Over the field of complex numbers, Madani, L. Nisse, and M. Nisse proved similar results for analytic subvarieties of tori.
We construct a family of examples of Legendrian subvarieties in some projective spaces. Although most of them are singular, a new example of smooth Legendrian variety in dimension 8 is in this family. The 8-fold has interesting properties: it is a compactification of the special linear group, a Fano manifold of index 5 and Picard number 1.
We give a complete description of the cohomology ring $A^*(\overline Z)$ of a compactification of a linear subvariety $Z$ of a torus in a smooth toric variety whose fan $Σ$ is supported on the tropicalization of $Z$. It turns out that cocycles on $\overline Z$ canonically correspond to Minkowski weights on $Σ$ and that the cup product is described by the intersection product on the tropical matroid variety $\operatorname{Trop}(Z)$.
Points of bounded height on certain subvarieties of toric varieties
本文结合分裂挠子法与双曲线法，计算环面簇某些子簇上高度有界的有理点和Campana点。
Non-archimedean Monge-Ampère measures for toric metrics on subvarieties of toric varieties
本文研究环面簇子簇上环面度量的非阿基米德Monge-Ampère测度，利用热带芽与热带格林函数显式描述其局部结构，推广热带相交积，为阿贝尔簇情形提供环面类比。
Resolutions of toric subvarieties by line bundles and applications
本文利用实环面分层，用环面 Frobenius 前推的线丛直和项构造环面子簇结构层的长度 k 分解，并据此证明虚拟合冲定理、Rouquier 维数及导出范畴生成等猜想。
Classification of Equivariant Legendrian Embeddings of Rational Homogeneous Spaces into Nilpotent Orbits
本文研究了有理齐性空间到adjoint种的等变Legendrian嵌入分类，通过分析Nilpotent轨道的复接触结构，提出了一种基于稳定子群作用的齐性子变种分类方法。
We establish the Hodge conjecture for some subvarieties of a class of toric varieties. First we study quasi-smooth intersections in a projective simplicial toric variety, which is a suitable notion to generalize smooth complete intersection subvarieties in the toric environment, and in particular quasi-smooth hypersurfaces. We show that under appropriate conditions, the Hodge Conjecture holds for a very general quasi-smooth intersection subvariety, generalizing the work on quasi-smooth hypersurfaces of the first author and Grassi in [3]. We also show that the Hodge Conjecture holds asymptotica…
Toric subvarieties of projective space are classified up to projective automorphisms.
Invertible sheaves and $Π$-invertible sheaves on the isomeric supergrassmannian and its toric subvarieties
本文证明了同构超格拉斯曼流形的 Picard 群和 $Π$-Picard 集除特定 $Π$-射影空间外均为平凡，并扩展该技术通过单纯形因子计数计算超环面轨道闭包的相应群集，最后将非平凡层构造为 tautological 层的对称幂。
Laurent polynomial mirrors for quiver flag zero loci
本文针对高维法诺簇分类问题，将Gelfand–Cetlin退化推广到Y形箭图旗簇，提出构造法诺箭图旗零轨迹洛朗多项式镜像的方法，并验证了99个四维情形的猜想镜像。
Tropicalization is a procedure that assigns polyhedral complexes to algebraic subvarieties of a torus. If one fixes a weighted polyhedral complex, one may study the set of all subvarieties of a toric variety that have that complex as their tropicalization. This gives a "tropical realization" moduli functor. We use rigid analytic geometry and the combinatorics of Chow complexes as studied by Alex Fink to prove that when the ambient toric variety is quasiprojective, the moduli functor is represented by a rigid space. As an application, we show that if a polyhedral complex is the tropicalization …
Monodromy action of mirror stops for toric Calabi-Yau surfaces
本文研究了镜像对称中通过猜测的弦性Kähler模空间的基本群作用于代数簇导出范畴的行动，提出通过Legendrian模空间研究，并在A_n-1奇点上构造了部分包裹的Fukaya范畴的圆柱辫群作用。
This paper classifies toric Fano 3-folds with singular locus { 1/k(1,1,1) } for any positive integer k, building on the work of Batyrev and Watanabe-Watanabe. This is achieved by completing an equivalent problem in the language of Fano polytopes. Furthermore we identify birational relationships between entries of the classification. For a fixed value k>4, there are exactly two such Fano 3-folds linked by a blow-up in a torus-invariant line.
Dimension Results for Extremal-Generic Polynomial Systems over Complete Toric Varieties
本文研究了完全多面体扇构建的环面簇Cox环中指定单项式支撑的多项式系统，给出了相关子簇维数的组合公式，确定了多面体代数中一般系统构成正则序列的度数，并回答了Gröbner基文献中的开放问题。
We introduce extended tropicalizations for closed subvarieties of toric varieties and show that the analytification of a quasprojective variety over a nonarchimedean field is naturally homeomorphic to the inverse limit of the tropicalizations of its quasiprojective embeddings.
We give a new lower bound for the essential minimum of subvarieties of abelian varieties with small codimension, under a conjecture about ordinary primes in abelian varieties. This lower bound is already known in the toric case since the work of Amoroso and David. It is the best expected, "up to an epsilon", in the degree of the subvariety.
We present a new geometric interpretation of equivariant cohomology in which one replaces a smooth, complex $G$-variety $X$ by its associated arc space $J_{\infty} X$, with its induced $G$-action. This not only allows us to obtain geometric classes in equivariant cohomology of arbitrarily high degree, but also provides more flexibility for equivariantly deforming classes and geometrically interpreting multiplication in the equivariant cohomology ring. Under appropriate hypotheses, we obtain explicit bijections between $\mathbb{Z}$-bases for the equivariant cohomology rings of smooth varieties …
Varieties covered by affine spaces, uniformly rational varieties and their cones
本研究将仿射锥的格罗莫夫椭圆性结论，从旗流形、有理光滑射影曲面推广到逐次爆发后的光滑射球星形簇、一致有理射影簇及稳定一致有理完全簇。
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