Guy Casale, Frank Loray, Jorge Vitório Pereira, Frédéric Touzet
A transitive Lie algebra g of rational vector fields on a projective manifold which do not preserve any foliation determines a rational map to an algebraic homogenous space G/H which maps g to lie(G).
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Rationally connected rational double covers of primitive Fano varieties
本研究证明M≥5时P^{M+1}中M+1次Zariski一般超曲面不存在阿贝尔群的高次Galois有理连通覆盖，尤其不存在2次有理连通有理映射，该结论可推广至其他本原Fano簇并启发绝对刚性猜想。
We prove that any ample class on a primitive symplectic variety that is locally trivial deformation of O'Grady's singular 6 dimensional example is proportional to the first Chern class of a uniruled divisor. This result answers a question of Lehn, Mongardi and Pacienza, extending their result for primitive symplectic varieties of this deformation type.
Rational Integrals of the second kind on a complex projective manifold and its primitive cohomology
设X是一个n+1维复代数流形，它嵌入一个足够高维的复射影空间，Y是X的一般超平面截面。利用X上的有理积分刻画了H^p（X-Y，C）上的混合Hodge结构和Y的中本原上同调群H^n（Y，C）_0的Hodge滤子. (Key原上同调，第二类有理积分，广义Poincare剩余映射，Hodge滤子，混合Hodge结构）
We study the deformation theory of rational curves on primitive symplectic varieties and show that if the rational curves cover a divisor, then, as in the smooth case, they deform along their Hodge locus in the universal locally trivial deformation. As applications, we extend Markman's deformation invariance of prime exceptional divisors along their Hodge locus to this singular framework and provide existence results for uniruled ample divisors on primitive symplectic varieties which are locally trivial deformations of any moduli space of semistable objects on a projective $K3$ or fibers of th…
The number of rational curves on K3 surfaces
设X是一个K3曲面，它具有一个本原充分因子H，令$β=2[H]\in H_2(X, \mathbf Z)$ .利用某些稳定层的模空间的欧拉数计算了Gromov-Witten型不变量$n_β$.最后在非本原类$β$中验证了Yau-Zaslow公式。
Singularities of Rational Curves on K3 surfaces
证明了一般K3曲面的任一亏格的本原类中的每一条有理曲线都是结点曲线。
We present the first explicit examples of a rational threefold and a Calabi-Yau threefold, admitting biregular automorphisms of positive entropy not preserving any dominant rational maps to lower positive dimensional varieties. The most crucial part is the rationality of the quotient threefold of a 3-dimensional torus of product type.
A Simple Proof that Rational Curves on K3 are Nodal
给出了一般K3曲面的本原类中的每一条有理曲线都是结点曲线的简单证明。
We show that, in any dimension greater than one, there are an abelian variety, a smooth rational variety and a Calabi-Yau manifold, with primitive birational automorphisms of first dynamical degree $>1$. We also show that there are smooth complex projective Calabi-Yau manifolds and smooth rational manifolds, of any even dimension, with primitive biregular automorphisms of positive topological entropy.
We use Gromov-Witten theory to study rational curves in holomorphic symplectic varieties. We present a numerical criterion for the existence of uniruled divisors swept out by rational curves in the primitive curve class of a very general holomorphic symplectic variety of $K3^{[n]}$ type. We also classify all rational curves in the primitive curve class of the Fano variety of lines in a very general cubic $4$-fold, and prove the irreducibility of the corresponding moduli space. Our proofs rely on Gromov-Witten calculations by the first author, and in the Fano case on a geometric construction of…
A generalization of Griffiths' theorem on rational integrals
利用局部Bernstein-Sato多项式、Kashiwara和Malgrange沿超曲面的V-滤子以及超曲面整体定义方程的Brieskorn模，推广了Griffiths关于光滑射影超曲面本原上同调的Hodge滤子定理.
A Lie Algebra Method for Rational Parametrization of Severi-Brauer Surfaces
Severi-Brauer曲面有有理点当且仅当它同构于射影平面。给定一个Severi-Brauer曲面，我们研究的问题是：是否存在这样一个到射影平面的同构或这样一个有理点，并在肯定的情况下构造这样一个同构或这样一个有理点。利用李代数技巧给出了一个算法。该算法已在Magma中实现。
In this note we improve the theorem on Galois rational covers $X\dashrightarrow V$ for primitive Fano varieties $V$, recently proven by the author, in the two directions: we extend to the maximum the class of Galois groups $G$, for which the proof works, and relax the conditions that must be satisfied by the variety $V$ -- the divisorial canonicity alone is sufficient.
On Primitive Ulrich Bundles over a few projective varieties with Picard number two
本文在光滑射影簇中引入本原 Ulrich 丛的概念，并在次数 $6$ 的旗三维簇和有理法向滚动面情形下给出了其上同调刻画，同时提出了若干开放问题。
Twists of X(7) and primitive solutions to x^2+y^3=z^7
我们找到x^2+y^3=z^7的原始整数解。一个非交换下降参数涉及单群168阶群减少了问题的一套有理点的有限集的扭曲的克莱因四次曲线X的确定。利用X与模曲线X（7）之间的同构关系，利用椭圆曲线的模性和降阶来限制相关twist的集合.这留下10个亏格-3曲线，其有理点通过组合的方法被发现。
For any non-simply laced Lie group $G$ and elliptic curve $Σ$, we show that the moduli space of flat $G$ bundles over $Σ$ can be identified with the moduli space of rational surfaces with $G$-configurations which contain $Σ$ as an anti-canonical curve. We also construct $Lie(G)$-bundles over these surfaces. The corresponding results for simply laced groups were obtained by the authors in another paper. Thus we have established a natural identification for these two kinds of moduli spaces for any Lie group $G$.
Parametrizing Del Pezzo surfaces of degree 8 using Lie algebras
对于一个Del Pezzo曲面的8度以上的理性，我们决定是否有一个合理的参数化的表面和建设一个在肯定的情况下。我们定义并利用曲面的李代数来达到这个目的。该算法已在Magma中实现。
We prove that the group of automorphisms of the Lie algebra $\Der_K (Q_n)$ of derivations of the field of rational functions $Q_n=K(x_1,..., x_n)$ over a field of characteristic zero is canonically isomorphic to the group of automorphisms of the $K$-algebra $Q_n$.
We give an explicit construction of Lie algebras of type $E_7$ out of a Lie algebra of type $D_6$ with some restrictions. Up to odd degree extensions, every Lie algebra of type $E_7$ arises this way. For Lie algebras that admit a $56$-dimensional representation we provide a more symmetric construction based on an observation of Manivel; the input is seven quaternion algebras subject to some relations.
We study minimal rational curves on a complex manifold that are tangent to a distribution. In this setting, the variety of minimal rational tangents (VMRT) has to be isotropic with respect to the Levi tensor of the distribution. Our main result is a converse of this: any smooth projective variety isotropic with respect to a vector-valued anti-symmetric form can be realized as VMRT of minimal rational curves tangent to a distribution on a complex manifold. The complex manifold is constructed as a partial equivariant compactification of a metabelian group, which is a result of independent intere…
Let $K$ be any field and $G$ be a finite group. Let $G$ act on the rational function field $K(x_g:g\in G)$ by $K$-automorphisms defined by $g\cdot x_h=x_{gh}$ for any $g,h\in G$. Noether's problem asks whether the fixed field $K(G)=K(x_g:g\in G)^G$ is rational (=purely transcendental) over $K$. We will prove that if $G$ is a non-abelian $p$-group of order $p^n$ ($n\ge 3$) containing a cyclic subgroup of index $p^2$ and $K$ is any field containing a primitive $p^{n-2}$-th root of unity, then $K(G)$ is rational over $K$. As a corollary, if $G$ is a non-abelian $p$-group of order $p^3$ and $K$ is…
Since Quillen proved his famous equivalences of homotopy categories in 1969, much work has been done towards classifying the rational homotopy types of simply connected topological places. The majority of this work has focused on rational homotopy types with the same cohomology algebra. The models in this case were differential graded algebras and acted similarly to differential forms. These models were then used together with some deformation theory to describe a moduli space for all rational homotopy types with a given cohomology algebra. Indeed, this theory has been very well developed. How…
Let G be a split simple group of type G_2 over a field k, and let g be its Lie algebra. Answering a question of Colliot-Thélène, Kunyavskiĭ, Popov, and Reichstein, we show that the function field k(g) is generated by algebraically independent elements over the field of adjoint invariants k(g)^G. Soit G un groupe algébrique simple et déployé de type G_2 sur un corps k. Soit g son algèbre de Lie. On démontre que le corps des fonctions k(g) est transcendant pur sur le corps k(g)^G des invariants adjoints. Ceci répond par l'affirmative à une question posée par Colliot-Thélène, Kunyavskiĭ, Popov et…
A Construction of a Differential Graded Lie Algebra in the Category of Effective Homological Motives
本文在Nori的有效同调模范畴中构造了一个微分分次李代数。事实上，这种构造在更一般的环境中而不是在阿贝尔范畴中起作用。这使得我们可以给1-连通空间的有理同伦李代数一个motivic结构。因此，有理同伦李代数继承了混合的Hodge结构和Galois模结构.
We construct two algebraic versions of homotopy theory of rational disconnected topological spaces, one based on differential graded commutative associative algebras and the other one on complete differential graded Lie algebras. As an application of the developed technology we obtain results on the structure of Maurer-Cartan spaces of complete differential graded Lie algebras.
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