Holomorphic bundles on diagonal Hopf manifolds

指标与留数：从庞加莱-霍普夫（Poincaré-Hopf）到鲍姆-博特（Baum-Bott），以及马尔科·布鲁内拉（Marco Brunella）

Indices and residues: from Poincaré-Hopf to Baum-Bott, and Marco Brunella

该综述性文章研究向量场与全纯叶状结构的不变量，旨在关联复解析奇异簇与复流形上奇异全纯叶状结构这两个有诸多共通点的理论领域。

Ricci-flat Deformations of Holomorphic Vector Bundles

In this paper we give a criterion for a deformation of a hermitian vector bundle to be Ricci-flat. As an application we show that on a Kähler manifold, every deformation of a vector bundle can be made Ricci-flat whereas on some Hopf manifolds, the non-existence of a Ricci-flat deformation is related to non-trivial vector bundles on the universal cover ${\mathbb C}^n\setminus\{0\}$. On a surface with $b_1(X)\not=0$ filtrable Ricci-rigid vector bundles prove to be very special. We apply this to Inoue and Hopf surfaces.

Stable bundles on Hopf manifolds

In this paper, we study holomorphic vector bundles on (diagonal) Hopf manifolds. In particular, we give a description of moduli spaces of stable bundles on generic (non-elliptic) Hopf surfaces. We also give a classification of stable rank-2 vector bundles on generic Hopf manifolds of complex dimension greater than two.

Resolution of Diagonals and Moduli Spaces

In this paper differential operators on various moduli spaces (e.g. of holomorphic vector bundles) are described in a canonical way in terms of the geometry of a certain distinguished completion of an appropriate configuration space.

Hopf流形中子簇上的凝聚层

Coherent sheaves on subvarieties in Hopf manifolds

本文证明了对于具有中心为x的可逆全纯收缩γ的正规复解析簇X，GAGA定理的一个版本，并研究了X的仿射簇结构以及γ-等变凝聚层的代数化，进而通过商簇X₀/γ嵌入Hopf流形，给出了Hopf流形中正规子簇的结构定理和凝聚层的滤过性。

The Dolbeault dga of the formal neighborhood of the diagonal

A well-known theorem of Kapranov states that the Atiyah class of the tangent bundle $TX$ of a complex manifold $X$ makes the shifted tangent bundle $TX[-1]$ into a Lie algebra object in the derived category $D(X)$. Moreover, he showed that there is an $L_\infty$-algebra structure on the Dolbeault resolution of $TX[-1]$ and wrote down the structure maps explicitly in the case when $X$ is Kähler. The corresponding Chevalley-Eilenberg complex is isomorphic to the Dolbeault resolution of the jet bundle $\mathcal{J}^\infty_X$ via the construction of the holomorphic exponential map of the Kähler man…

Automorphisms of locally conformally Kahler manifolds

A manifold M is locally conformally Kahler (LCK) if it admits a Kahler covering with monodromy acting by holomorphic homotheties. For a compact connected group G acting on an LCK manifold by holomorphic automorphisms, an averaging procedure gives a G-invariant LCK metric. Suppose that U(1) acts on an LCK manifold M by holomorphic isometries, and the lifting of this action to the Kahler cover of M is not isometric. We show that the cover admits an automorphic Kahler potential, and hence can be embedded to a Hopf manifold.

Hopf流形上的非半正 nef 线丛

Nef but Non-Semi-positive Line Bundles on Hopf Manifolds

该研究刻画了Hopf流形的相关锥，证明其不变椭圆曲线为nef非半正，并借助Bott–Chern上同调在任意维Hopf流形上构造了这类线丛的新例子。

Rational curves on Hermitian manifolds

By using analytic method, we prove that there exist rational curves on compact Hermitian manifolds with positive holomorphic bisectional curvature. It confirms a question of S.-T. Yau. It is well-known that Mori proved in \cite{Mori79} that every compact complex manifold $N$ with $c_1(N)>0$ contains at least one rational curve. However, as a borderline example, we show that the standard Hopf surface $S^1\times S^3$ has a Hermitian metric with non-negative holomorphic bisectional curvature (in particular, $c_1(S^1\times S^3)\geq 0$), but it contains no rational curve.

Cox构造的等变自同构及其应用

Equivariant automorphisms of the Cox construction and applications

本文刻画单扇Cox构造关于大环面中足够大的连通复李子群的等变全纯自同构群，并用于确定有理矩角流形及完备单扇环面簇的相应自同构群。