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We prove the Jordan property for groups of bimeromorphic selfmaps of three-dimensional compact K\"ahler varieties of non-negative Kodaira dimension and positive irregularity.

Algebraic Geometry · Mathematics 2022-09-19 Yuri Prokhorov , Constantin Shramov

Let $X$ be a non-uniruled compact K\"ahler space of dimension 3. We show that the group of bimeromorphic automorphisms of $X$ is Jordan. More generally, the same result holds for any compact K\"ahler space admitting a quasi-minimal model.

Algebraic Geometry · Mathematics 2022-09-07 Aleksei Golota

We determine three-dimensional algebraic varieties whose groups of birational selfmaps do not satisfy the Jordan property.

Algebraic Geometry · Mathematics 2017-07-12 Yuri Prokhorov , Constantin Shramov

In this survey we discuss holomorphic $\mathbb{P}^1$-bundles $p: X \to Y$ over a non-uniruled complex compact K\"ahler manifold $Y$, paying a special attention to the case when $Y$ is a complex torus. We discuss so called Jordan properties…

Complex Variables · Mathematics 2023-03-02 Tatiana Bandman , Yuri G. Zarhin

We classify non-algebraic compact K\"ahler threefolds admitting an endomorphism $f: X \to X$ of degree at least two.

Algebraic Geometry · Mathematics 2017-11-10 Andreas Höring , Thomas Peternell

Let $X$ be a smooth manifold belonging to one of these three collections: acyclic manifolds (compact or not, possibly with boundary), compact connected manifolds (possibly with boundary) with nonzero Euler characteristic, integral homology…

Differential Geometry · Mathematics 2019-04-24 Ignasi Mundet i Riera

We prove that the image of the pluricanonical representation of a group of bimeromorphic automorphisms of a complex manifold has bounded finite subgroups. As a consequence, we show that the group of bimeromorphic automorphisms of an…

Algebraic Geometry · Mathematics 2022-09-27 Konstantin Loginov

Being inspired by a work of Curtis T. McMullen about a very impressive automorphism of a K3 surface of Picard number zero, we shall clarify the structure of the bimeromorphic automorphism group of a non-projective hyperk\"ahler manifold, up…

Algebraic Geometry · Mathematics 2007-05-23 Keiji Oguiso

We give a bimeromorphic classification of compact K\"ahler manifolds of Kodaira codimension one that admit a holomorphic one form without zeros.

Complex Variables · Mathematics 2025-12-10 Simon Pietig

We classify compact complex surfaces whose groups of bimeromorphic selfmaps have bounded finite subgroups. We also prove that the stabilizer of a point in the automorphism group of a compact complex surface of zero Kodaira dimension, as…

Algebraic Geometry · Mathematics 2021-02-03 Yuri Prokhorov , Constantin Shramov

If $f$ is an automorphism of a compact simply connected K\"ahler manifold with trivial canonical bundle that fixes a K\"ahler class, then the order of $f$ is finite. We apply this well known result to construct compact non-K\"ahler…

Algebraic Geometry · Mathematics 2012-11-30 Gunnar Þór Magnússon

We study the groups of biholomorphic and bimeromorphic automorphisms of conic bundles over certain compact complex manifolds of algebraic dimension zero.

Algebraic Geometry · Mathematics 2020-06-30 Tatiana Bandman , Yuri G. Zarhin

Let X be a compact K\"ahler threefold that is not uniruled. We prove that X has a minimal model.

Algebraic Geometry · Mathematics 2017-11-27 Andreas Höring , Thomas Peternell

Using examples of compact complex 3-manifolds which arise as twistor spaces, we show that the class of compact complex manifolds bimeromorphic to K\"ahler manifolds is not stable under small deformations of complex structure.

alg-geom · Mathematics 2008-02-03 Claude LeBrun , Yat-Sun Poon

We classify compact almost-K\"ahler four manifolds with nonnegative biorthogonal curvature.

Differential Geometry · Mathematics 2023-11-29 Inyoung Kim

We prove that the automorphism group of a compact complex parallelizable manifold is Jordan. In the course of the proof we show that outer automorphism groups of cocompact lattices in complex Lie groups have bounded finite subgroups.

Algebraic Geometry · Mathematics 2023-12-01 Aleksei Golota

We show that a compact complex manifold $X$ has no non-trivial nef $(1,1)$-classes if there is a non-isomorphic bimeromorphic map $f\colon X\dashrightarrow Y$ isomorphic in codimension $1$ to a compact K\"ahler manifold $Y$ with…

Algebraic Geometry · Mathematics 2025-02-26 Jia Jia , Sheng Meng

Let $X$ be a complex projective variety. Suppose that the group of birational automorphisms of $X$ contains finite subgroups isomorphic to $(\mathbb{Z}/N\mathbb{Z})^r$ for $r$ fixed and $N$ arbitrarily large. We show that $r$ does not…

Algebraic Geometry · Mathematics 2024-09-13 Aleksei Golota

We prove that a compact contact threefold which is bimeromorphically equivalent to a Kaehler manifold and not rationally connected is the projectivised tangent bundle of a Kaehler surface.

Algebraic Geometry · Mathematics 2010-05-11 Kristina Frantzen , Thomas Peternell

Let $X$ be a compact K{\"a}hler manifold of dimension three. We prove that there exists a projective manifold $Y$ such that $\pi\_1(X)\simeq \pi\_1(Y)$. We also prove the bimeromorphic existence of algebraic approximations for compact…

Algebraic Geometry · Mathematics 2020-01-08 Benoît Claudon , Andreas Höring , Hsueh-Yung Lin
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