Holomorphic quantization formula in singular reduction

Dynamics of Singular Holomorphic Foliations on the Complex Projective Plane

This manuscript is an introduction to the theory of holomorphic foliations on the complex projective plane. Historically the subject has emerged from the theory of ODEs in the complex domain and various attempts to solve Hilbert's 16th Problem, but with the introduction of complex algebraic geometry, foliation theory and dynamical systems, it has now become an interesting subject of its own.

Optimal $L^2$ extension for holomorphic vector bundles with singular hermitian metrics

In the present paper, we study the properties of singular Nakano positivity of singular hermitian metrics on holomorphic vector bundles, and establish an optimal $L^2$ extension theorem for holomorphic vector bundles with singular hermitian metrics on weakly pseudoconvex Kähler manifolds. As applications, we give a necessary condition for the holding of the equality in optimal $L^2$ extension theorem, and present singular hermitian holomorphic vector bundle versions of some $L^2$ extension theorems with optimal estimate.

Deformation quantization of compact Kähler manifolds via Berezin-Toeplitz operators

This talk reports on results on the deformation quantization (star products) and on approximative operator representations for quantizable compact K"ahler manifolds obtained via Berezin-Toeplitz operators. After choosing a holomorphic quantum line bundle the Berezin-Toeplitz operator associated to a differentiable function on the manifold is the operator defined by multiplying global holomorphic sections of the line bundle with this function and projecting the differentiable section back to the subspace of holomorphic sections. The results were obtained in (respectively based on) joint work wi…

关于拓扑-全纯场论的重整化和量子化

On the renormalization and quantization of topological-holomorphic field theories

本文研究拓扑-全纯场论的重整化和量子化问题，证明在模型流形R^{d'}×C^d上此类混合理论的紫外有限性，并展示两种消失结果：当d'=1时，奇环量子化障碍消失；当d'>1时，所有障碍消失，允许定义量子可观测量的因子化代数结构。

Local classification of singular hexagonal 3-webs with holomorphic Chern connection and infinitesimal symmetries

We provide a complete classification of hexagonal singular 3-web germs in the complex plane, satisfying the following two conditions: 1) the Chern connection remains holomorphic at the singular point, 2) the web admits at least one infinitesimal symmetry at this point. As a by-product, a classification of hexagonal weighted homogeneous 3-webs is obtained.

正拉格朗日量的量子化

Quantization of positive Lagrangians

本研究针对近Calabi-Yau流形中的正拉格朗日子流形，利用量子化映射与Hörmander估计，证明相对Kähler类为有理斜率时其度量诱导路径度量，为拉格朗日子流形的量子化提供关键结果。

Almost holomorphic embeddings in Grassmannians with applications to singular simplectic submanifolds

We use Donaldson's approximately holomorphic techniques to build embeddings of a closed symplectic manifold with symplectic form of integer class in the grassmannians Gr(r,N). We assure that these embeddings are asymptotically holomorphic in a precise sense. We study first the particular case of embeddings in the projective space $CP^N$ obtaining control on N. The main reason of our study is the construction of singular determinantal submanifolds as the intersection of the embedding with certain ``generalized Schur cycles'' defined on a product of grassmannians. It is shown that the symplectic…

Kähler流形上的范畴量子化

Categorical quantization on Kähler manifolds

本文利用Fedosov粘合论证构造Kähler流形上Hermite全纯向量丛范畴的量子化范畴DQ，定义可量子化态射，并证明在预量子化条件下该范畴等价于全纯微分算子范畴GQ。

Singular holomorphic foliations by curves. III: Zero Lelong numbers

Let $\mathcal{F}$ be a holomorphic foliation by curves defined in a neighborhood of $0$ in $\mathbb{C}^n$ ($n\geq 2$) having $0$ as a weakly hyperbolic singularity. Let $T$ be a positive harmonic current directed by $\mathcal{F}$ which does not give mass to any of the $n$ coordinate invariant hyperplanes $\{z_j=0\}$ for $1\leq j\leq n.$ Then we show that the Lelong number of $T$ at $0$ vanishes. Moreover, an application of this local result in the global context is given. We discuss also the relation between several basic notions such as directed positive harmonic currents, directed positive d…

关于全纯叶形的奇点集连通性的研究

On the connectedness of the singular set of holomorphic foliations

本文研究全纯叶形奇点集的连通性，证明其在特定条件下必连通，并由此得到关于全纯分布可积性的拓扑障碍，回答了Cerveau关于三维射影空间上一维叶形的问题。

Hermitian-holomorphic Deligne cohomology, Deligne pairing for singular metrics, and hyperbolic metrics

We introduce a model for Hermitian holormorphic Deligne cohomology on a projective algebraic manifold which allows to incorporate singular hermitian structures along a normal crossing divisor. In the case of a projective curve, the cup-product in cohomology is shown to correspond to a generalization of the Deligne pairing to line bundles with "good" hermitian metrics in the sense of Mumford and others. A particular case is that of the tangent bundle of the curve twisted by the negative of the singularity divisor of a hyperbolic metric: its cup square (corrected by the total area) is shown to b…

Quantization formula for singular reductions

In this note, we prove a quantization formula for singular reductions. The main result is obtained as a simple application of an extended quantization formula proved in [TZ2].

Singular holomorphic foliations by curves I: Integrability of holonomy cocycle in dimension 2

We study the holonomy cocycle H of a holomorphic foliation \Fc by Riemann surfaces defined on a compact complex projective surface X satisfying the following two conditions: 1) its singularities E are all hyperbolic; 2) there is no holomorphic non-constant map \C\to X such that out of E the image of \C is locally contained in a leaf. Let T be a harmonic current tangent to \Fc which does not give mass to any invariant analytic curve. Using the leafwise Poincaré metric, we show that H is integrable with respect to T. Consequently, we infer the existence of the Lyapunov exponent function of T.

Singular hermitian metrics on holomorphic vector bundles

We introduce and study a notion of singular hermitian metrics on holomorphic vector bundles, following Berndtsson and P{ă}un. We define what it means for such a metric to be curved in the sense of Griffiths and investigate the assumptions needed in order to locally define the cuvature $Θ^h$ as a matrix of currents. We then proceed to show that such metrics can be regularised in such a way that the corresponding curvature tensors converge weakly to $Θ^h$. Finally we define what it means for $h$ to be strictly negatively curved in the sense of Nakano and show that it is possible to regularise su…

Triviality of fibered Calabi-Yau manifolds without singular fibers

In this note we show that if a compact Kahler manifold with trivial canonical bundle is the total space of a holomorphic fibration without singular fibers, then the fibration is a holomorphic fiber bundle. In the algebraic case, the fibration becomes trivial after a finite base change.

Singular projective varieties and quantization

By the quantization condition compact quantizable Kaehler manifolds can be embedded into projective space. In this way they become projective varieties. The quantum Hilbert space of the Berezin-Toeplitz quantization (and of the geometric quantization) is the projective coordinate ring of the embedded manifold. This allows for generalization to the case of singular varieties. The set-up is explained in the first part of the contribution. The second part of the contribution is of tutorial nature. Necessary notions, concepts, and results of algebraic geometry appearing in this approach to quantiz…

Brane quantization of toric Poisson varieties

In this paper we propose a noncommutative generalization of the relationship between compact Kähler manifolds and complex projective algebraic varieties. Beginning with a prequantized Kähler structure, we use a holomorphic Poisson tensor to deform the underlying complex structure into a generalized complex structure, such that the prequantum line bundle and its tensor powers deform to a sequence of generalized complex branes. Taking homomorphisms between the resulting branes, we obtain a noncommutative deformation of the homogeneous coordinate ring. As a proof of concept, this is implemented f…

几何量子化中的谱收敛——非奇异拉格朗日纤维化情形

Spectral convergence in geometric quantization -- the case of non-singular Langrangian fibrations

该研究利用度量测度空间收敛理论研究几何量子化，证明了预量子化辛流形上Kähler极化收敛于非奇异实极化时$\bar{\bar{∂}}$-拉普拉斯算子的谱及量子希尔伯特空间的收敛性，还得到近Kähler量子化的类似结果。

Berezin quantization and unitary representations of Lie groups

In 1974, Berezin proposed a quantum theory for dynamical systems having a Kähler manifold as their phase space. The system states were represented by holomorphic functions on the manifold. For any homogeneous Kähler manifold, the Lie algebra of its group of motions may be represented either by holomorphic differential operators (``quantum theory"), or by functions on the manifold with Poisson brackets, generated by the Kähler structure (``classical theory"). The Kähler potentials and the corresponding Lie algebras are constructed now explicitly for all unitary representations of any compact si…

全纯向量丛的奇异 Hermite 度量的正性

Positivity of Singular Hermitian Metrics for Holomorphic Vector Bundles

本文为全纯向量丛的奇异 Hermite 度量引入 Nakano 和 Demailly 正性，支持消没定理并证明尖锐的 Ohsawa-Takegoshi 型 $L^2$ 延拓定理及 Berndtsson 型正性定理。

$\mathbb{P}^n$ 上曲线全纯叶状结构的一般奇点

Generic singularities of holomorphic foliations by curves on $\mathbb{P}^n$

本文研究射影空间上一般奇异曲线全纯叶状结构，证明满测度集合中叶状结构的奇点均可线性化且双曲，并在次数至少为2时无不变代数曲线。

Quantization of the Laplacian operator on vector bundles I

Let $(E,h)$ be a holomorphic Hermitian vector bundle over a polarized manifold. We provide a canonical quantization of the Laplacian operator acting on sections of the bundle of Hermitian endomorphisms of $E$. If $E$ is simple we obtain an approximation of the eigenvalues and eigenspaces of the Laplacian.

Equivariant Holomorphic Morse Inequalities III: Non-Isolated Fixed Points

We prove the equivariant holomorphic Morse inequalities for a holomorphic torus action on a holomorphic vector bundle over a compact Kahler manifold when the fixed-point set is not necessarily discrete. Such inequalities bound the twisted Dolbeault cohomologies of the Kahler manifold in terms of those of the fixed-point set. We apply the inequalities to obtain relations of Hodge numbers of the connected components of the fixed-point set and the whole manifold. We also investigate the consequences in geometric quantization, especially in the context of symplectic cutting.

Quantization of Donaldson's heat flow over projective manifolds

Consider $E$ a holomorphic vector bundle over a projective manifold $X$ polarized by an ample line bundle $L$. Fix $k$ large enough, the holomorphic sections $H^0(E\otimes L^k)$ provide embeddings of $X$ in a Grassmanian space. We define the \textit{balancing flow for bundles} as a flow on the space of projectively equivalent embeddings of $X$. This flow can be seen as a flow of algebraic type hermitian metrics on $E$. At the quantum limit $k\to \infty$, we prove the convergence of the balancing flow towards the Donaldson heat flow, up to a conformal change. As a by-product, we obtain a numeri…

量化与可嵌入CR约化的约化可交换性

Quantization Commutes with Reduction for Embeddable CR Reductions

本文证明在严格伪凸且全局CR可嵌入的约化条件下，CR Guillemin-Sternberg映射为有界同构，通过消去Fredholm缺陷实现量化与约化的可交换性。

Energy quantization for a singular super-Liouville boundary value problem

In this paper, we develop the blow-up analysis and establish the energy quantization for solutions to super-Liouville type equations on Riemann surfaces with conical singularities at the boundary. In other problems in geometric analysis, the blow-up analysis usually strongly utilizes conformal invariance, which yields a Noether current from which strong estimates can be derived. Here, however, the conical singularities destroy conformal invariance. Therefore, we develop another, more general, method that uses the vanishing of the Pohozaev constant for such solutions to deduce the removability …

A First Approximation for Quantization of Singular Spaces

Many mathematical models of physical phenomena that have been proposed in recent years require more general spaces than manifolds. When taking into account the symmetry group of the model, we get a reduced model on the (singular) orbit space of the symmetry group action. We investigate quantization of singular spaces obtained as leaf closure spaces of regular Riemannian foliations on compact manifolds. These contain the orbit spaces of compact group actions and orbifolds. Our method uses foliation theory as a desingularization technique for such singular spaces. A quantization procedure on the…