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We define and study jet bundles in the geometric orbifold category. We show that the usual arguments from the compact and the logarithmic settings do not all extend to this more general framework. This is illustrated by simple examples of…

代数几何 · 数学 2020-04-06 Frédéric Campana , Lionel Darondeau , Erwan Rousseau

A recent theorem of Diverio--Trapani and Wu--Yau asserts that a compact K\"ahler manifold with a K\"ahler metric of quasi-negative holomorphic sectional curvature is projective and canonically polarized. This confirms a long-standing…

微分几何 · 数学 2023-05-04 Kyle Broder , Kai Tang

In the first part of this note we study compact Riemannian manifolds (M,g) whose Riemannian product with R is conformally Einstein. We then consider compact 6--dimensional almost Hermitian manifolds of type W_1+W_4 in the Gray--Hervella…

微分几何 · 数学 2019-01-08 Andrei Moroianu , Liviu Ornea

We prove that any compact complex surface with positive first Chern class admits an Einstein metric which is conformally related to a Kaehler metric. The key new ingredient is the existence of such a metric on the blow-up of the complex…

微分几何 · 数学 2007-06-13 Xiuxiong Chen , Claude LeBrun , Brian Weber

Let M be a hypercomplex Hermitian manifold, (M,I) the same manifold considered as a complex Hermitian with a complex structure I induced by the quaternions. The standard linear-algebraic construction produces a canonical nowhere degenerate…

代数几何 · 数学 2007-05-23 Misha Verbitsky

The paper studies the deformation theory of a holomorphic surjective map from a normal compact complex space to a compact Kaehler manifold and describes the component of the space of holomorphic maps, generalizing results in the projective…

代数几何 · 数学 2007-05-23 Jun-Muk Hwang , Thomas Peternell

The purpose of this paper is to prove the finiteness theorems for meromorphic mappings of a complete connected K\"{a}hler manifold into projective space sharing few hyperplanes in subgeneral position without counting multiplicity, where all…

复变函数 · 数学 2020-03-10 Thoan Pham Duc , Tuyen Nguyen Dang , Vangty Noulorvang

We survey some recent results and constructions of almost-K\"ahler manifolds whose curvature tensors have certain algebraic symmetries. This is an updated and corrected version of the (to be) published manuscript.

微分几何 · 数学 2007-05-23 Vestislav Apostolov , Tedi Draghici

In this paper, we first get a criterion formula for whether a differential form is holomorphic with respect to the generalized complex structure induced by $\epsilon$. Next, we get the local extensions of $\overline\partial$-closed forms on…

微分几何 · 数学 2018-03-13 Kang Wei

We amend the statement of point~(i) in Theorem~1.3 in arxiv:0901.1022 and supply the additional arguments and minor changes for the results that depend on it. We also seize the occasion and generalize to non-finitely generated lattices.

群论 · 数学 2019-08-29 Pierre-Emmanuel Caprace , Nicolas Monod

This survey aims to provide a guide to the literature on topological 4-manifolds. Foundational theorems on 4-manifolds are stated, especially in the topological category. Precise references are given, with indications of the strategies…

几何拓扑 · 数学 2024-01-03 Stefan Friedl , Matthias Nagel , Patrick Orson , Mark Powell

We make two tiny corrections to our previous paper with the same title, and also obtain, as a bonus, something new.

复变函数 · 数学 2007-11-06 Judith Brinkschulte , C. Denson Hill , Mauro Nacinovich

We study the de Rham 1-cohomology H^1_{DR}(M,G) of a smooth manifold M with values in a Lie group G. By definition, this is the quotient of the set of flat connections in the trivial principle bundle $M\times G$ by the so-called gauge…

微分几何 · 数学 2015-06-26 A. Brudnyi , A. Onishchik

Inspired by the work of Cordero-Erausquin, McCann and Schmuckenschl\"ager [{\it Invent. Math.,} 2001], we derive an explicit expression for the Jacobian determinant of the normal exponential map on a submanifold, establishing a relationship…

微分几何 · 数学 2026-05-08 Shengliang Pan , Chengyang Yi

We prove that Demailly's holomorphic Morse inequalities hold true for complex orbifolds by using a heat kernel method. Then we introduce the class of Moishezon orbifolds and as an application of our inequalties, we give a geometric…

微分几何 · 数学 2018-10-03 Martin Puchol

In this work, we investigate compact K\"ahler manifolds with non-negative or quasi-positive mixed curvature coming from a linear combination of the Ricci and holomorphic sectional curvature, which covers various notions of curvature…

微分几何 · 数学 2024-08-27 Jianchun Chu , Man-Chun Lee , Jintian Zhu

In this paper, we prove that a compact K\"ahler manifold $X$ with the nef anti-canonical bundle $-K_{X}$ admits a locally trivial fibration $\phi \colon X \to Y$, where the fiber $F$ is a rationally connected manifold and the base $Y$ is a…

代数几何 · 数学 2025-07-01 Shin-ichi Matsumura , Juanyong Wang , Xiaojun Wu , Qimin Zhang

We formulate a correspondence between affine and projective special K\"ahler manifolds of the same dimension. As an application, we show that, under this correspondence, the affine special K\"ahler manifolds in the image of the rigid r-map…

微分几何 · 数学 2018-01-17 Vicente Cortés , Peter-Simon Dieterich , Thomas Mohaupt

In this article, I prove the following statement: Every compact complex surface with even first Betti number is deformation equivalent to one which admits an extremal K\"ahler metric. In fact, this extremal K\"ahler metric can even be taken…

微分几何 · 数学 2008-09-26 Yujen Shu

Let M be a Kaehler manifold with a free, holomorphic and Hamiltonian action of the standard n-torus T. We give a simple, explicit and canonical formula for the Kaehler potential on the Kaehler reduction of M. As a consequence we can derive…

辛几何 · 数学 2007-05-23 D. Burns , V. Guillemin