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We prove a Kawamata-Viehweg vanishing theorem on a normal compact Kahler space X: if L is a nef line bundle with numerical dimension at least equal to 2, then the q-th cohomology group of K_X+L vanishes for q at least equal to the dimension…

Algebraic Geometry · Mathematics 2007-05-23 Jean-Pierre Demailly , Thomas Peternell

In this article, we establish the existence of a good minimal model for a compact K\"ahler klt pair $(X, B)$ when the Albanese map of $X$ is a projective morphism and the general fiber of $(X, B)$ has a good minimal model.

Algebraic Geometry · Mathematics 2026-04-20 Yu-Ting Huang

Let $Z$ be a compact, connected $3$-dimensional complex manifold with vanishing first and second Betti numbers and non-vanishing Euler characteristic. We prove that there is no holomorphic mapping from $Z$ onto any $2$-dimensional complex…

Algebraic Geometry · Mathematics 2024-08-15 Nobuhiro Honda , Jeff Viaclovsky

This is a sequel to [Ca01]=math.AG/0110051. We define the bimeromorphic {\it category} of geometric orbifolds. These interpolate between (compact K\" ahler) manifolds and such manifolds with logarithmic structure. These geometric orbifolds…

Algebraic Geometry · Mathematics 2009-07-15 Frederic Campana

We study algebraic fiber spaces $f:X \longrightarrow Y$ where $Y$ is of maximal Albanese dimension. In particular we give an effective version a theorem of Kawamata: If $P_m(X)=1$ for some $m \ge 2$, then the Albanese map of $X$ is…

Algebraic Geometry · Mathematics 2007-05-23 Jungkai A. Chen , Christopher D. Hacon

Given a bounded constructible complex of sheaves $\mathcal{F}$ on a complex Abelian variety, we prove an equality relating the cohomology jump loci of $\mathcal{F}$ and its singular support. As an application, we identify two subsets of the…

Algebraic Geometry · Mathematics 2024-02-29 Yajnaseni Dutta , Feng Hao , Yongqiang Liu

We present a simplified proof for a recent theorem by Junyan Cao and Mihai Paun, confirming a special case of Iitaka's conjecture: if $f \colon X\to Y$ is an algebraic fiber space, and if the Albanese mapping of $Y$ is generically finite…

Algebraic Geometry · Mathematics 2017-05-11 Christopher Hacon , Mihnea Popa , Christian Schnell

We shall show how to decompose, by functorial and canonical fibrations, arbitrary $n$-dimensional complex projective {Although the geometric results apply to compact K\" ahler manifolds without change, we consider here for simplicity this…

Algebraic Geometry · Mathematics 2010-01-22 Frederic Campana

For every fibration $f : X \to B$ with $X$ a compact K\"ahler manifold, $B$ a smooth projective curve, and a general fiber of $f$ an abelian variety, we prove that $f$ has an algebraic approximation.

Algebraic Geometry · Mathematics 2021-09-07 Hsueh-Yung Lin

We study the Albanese image of a compact K\"ahler manifold whose geometric genus is one. We prove that if the Albanese map is not surjective, then the manifold maps surjectively onto an ample divisor in some abelian variety, and in many…

Algebraic Geometry · Mathematics 2016-04-28 Jungkai Chen , Zhi Jiang , Zhiyu Tian

Let $X$ be an $(n+1)$-dimensional manifold, $\Delta$ be a one-dimensional foliation on $X$, and $p: X \to X / \Delta$ be a quotient map. We will say that a leaf $\omega$ of $\Delta$ is special whenever the space of leaves $X / \Delta$ is…

Geometric Topology · Mathematics 2017-10-19 Sergiy Maksymenko , Eugene Polulyakh

Let f:X->Y be an algebraic fiber space such that the general fiber has a good minimal model. We show that if f is the Iitaka fibration or if f is the Albanese map of relative dimension no more than three, then X has a good minimal model.

Algebraic Geometry · Mathematics 2010-02-03 Ching-Jui Lai

Consider a fibred compact K\"ahler manifold X endowed with a relatively ample line bundle, such that each fibre admits a constant scalar curvature K\"ahler metric and has discrete automorphism group. Assuming the base of the fibration…

Differential Geometry · Mathematics 2019-10-02 Ruadhaí Dervan , Lars Martin Sektnan

In their 2012 paper, Bobadilla and Koll\'ar studied topological conditions which guarantee that a proper map of complex algebraic varieties is a topological or differentiable fibration. They also asked whether a certain finiteness property…

Algebraic Geometry · Mathematics 2022-06-20 Yongqiang Liu , Laurenţiu Maxim , Botong Wang

We suggest a general framework for compactifing quasi-projective Lagrangian fibrations of geometric origin by holomorphic symplectic varieties. This framework includes a compactification criterion, which we then apply to various fibrations…

Algebraic Geometry · Mathematics 2025-01-22 Giulia Saccà

We classify these threefolds, which are the ones such that their universal cover is not compact and not covered by positive-dimensional compact analytic subsets. We show that these threefolds have nonnegative Kodaira dimension, and that…

Algebraic Geometry · Mathematics 2007-05-23 F. Campana , Q. Zhang

We prove that any compact complex manifold with finite fundamental group and algebraic dimension zero admits no holomorphic affine connection.

Differential Geometry · Mathematics 2019-11-12 Sorin Dumitrescu , Benjamin McKay

Using orbifold metrics of the appropriately signed Ricci curvature on orbifolds with negative or numerically trivial canonical bundle and the two-dimensional Log Minimal Model Program, we prove that the fundamental group of special compact…

Algebraic Geometry · Mathematics 2014-10-13 Frédéric Campana , Benoît Claudon

In this short article we show that if $(X, B)$ is a compact K\"ahler klt pair of maximal Albanese dimension, then it has a good minimal model, i.e. there is a bimeromorphic contraction $\phi:X\dashrightarrow X'$ such that $K_{X'}+B'$ is…

Algebraic Geometry · Mathematics 2022-08-04 Omprokash Das , Christopher Hacon

We construct classes of K\"ahler groups that do not have finite classifying spaces and are not commensurable to subdirect products of surface groups. Each of these groups is the fundamental group of the generic fibre of a holomorphic map…

Geometric Topology · Mathematics 2018-12-05 Martin R. Bridson , Claudio Llosa Isenrich