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A locally conformally Kahler (LCK) manifold is a manifold which is covered by a Kahler manifold, with the deck transform group acting by homotheties. We show that the blow-up of a compact LCK manifold along a complex submanifold admits an…

Algebraic Geometry · Mathematics 2013-10-07 Liviu Ornea , Misha Verbitsky , Victor Vuletescu

Main Result: Let $(M,L)$ be a smooth complex polarized threefold. Then the linear system $| K+tL|$ separates any two different points on $M$ for any $t\ge 6$, where $K$ is the canonical bundle of $M$. The argument in the proof is a variant…

alg-geom · Mathematics 2008-02-03 Takao Fujita

We consider (compact or noncompact) Lorentzian manifolds whose holonomy group has compact closure. Among other results, we obtain that this property is equivalent to admitting a parallel timelike vector field. We also derive some properties…

Differential Geometry · Mathematics 2016-03-24 Manuel Gutiérrez , Olaf Müller

A manifold $M$ is locally conformally Kahler (LCK) if it admits a Kahler covering with monodromy acting by holomorphic homotheties. Let $M$ be an LCK manifold admitting a holomorphic conformal flow of diffeomorphisms, lifted to a…

Differential Geometry · Mathematics 2021-03-01 Liviu Ornea , Misha Verbitsky

All compact K\"ahler, or even $\partial\bar\partial$-manifolds, are rationally formal. Not all of them are strongly formal. Yet some of them are: For complete smooth complex toric varieties and homogeneous compact K\"ahler manifolds we show…

Algebraic Topology · Mathematics 2025-10-21 Giovanni Placini , Jonas Stelzig , Leopold Zoller

In this article we introduce a generalization of locally conformally Kaehler metrics from complex manifolds to complex analytic spaces with singularities and study which properties of locally conformally Kaehler manifolds still hold in this…

Differential Geometry · Mathematics 2019-08-14 George-Ionut Ionita , Ovidiu Preda

We prove that when Hodge theory survives on non-compact symplectic manifolds, a compact symplectic Lie group action having fixed points is necessarily Hamiltonian, provided the associated almost complex structure preserves the space of…

Symplectic Geometry · Mathematics 2015-03-17 Alvaro Pelayo , Tudor S. Ratiu

In the paper we prove a factorization theorem for representations of fundamental groups of compact K\"{a}hler manifolds ({\em K\"{a}hler groups}) into solvable matrix groups. We apply this result to prove that the universal covering of a…

Complex Variables · Mathematics 2007-05-23 Alexander Brudnyi

In this paper we try to generalize the Haefliger theorem on completly solvable Lie foliations. We prove that: every completely solvable Lie foliation on a compact manifold is the inverse image of a homogenus foliation. Every manifold in…

Differential Geometry · Mathematics 2018-02-23 Ameth Ndiaye

In this paper, complex Hessian equation over K\"ahler manifold was studied. Under the condition that the underline K\"ahler manifold has non-negative holomorphic bisectional curvature, the existence and regularity of the solution was…

Differential Geometry · Mathematics 2008-12-25 Zuoliang Hou

We prove that a polar foliation of codimension at least three in an irreducible compact symmetric space is hyperpolar, unless the symmetric space has rank one. For reducible symmetric spaces of compact type, we derive decomposition results…

Differential Geometry · Mathematics 2014-01-10 Alexander Lytchak

We show that the joint spectral radius is pointwise H\"older continuous. In addition, the joint spectral radius is locally H\"older continuous for $\varepsilon$-inflations. In the two-dimensional case, local H\"older continuity holds on the…

Dynamical Systems · Mathematics 2025-02-26 Jeremias Epperlein , Fabian Wirth

We give a necessary and sufficient condition for a set of left invariant metrics on a compact Heisenberg manifold to be relatively compact in the corresponding moduli space.

Differential Geometry · Mathematics 2021-03-16 Sebastian Boldt

We classify holomorphic Pfaff systems (possibly non locally decomposable) on certain Hopf manifolds. As consequence, we prove some integrability results. We also prove that any holomorphic distribution on a general (non-resonance) Hopf…

Algebraic Geometry · Mathematics 2021-01-15 Maurício Corrêa , Antonio M. Ferreira , Misha Verbitsky

Finite energy pluripotential theory accommodates the variational theory of equations of complex Monge-Amp\`ere type arising in K\"ahler geometry. Recently it has been discovered that many of the potential spaces involved have a rich metric…

Differential Geometry · Mathematics 2023-09-19 Tamás Darvas

The aim of this paper is to classify compact, simply connected K\"ahler manifolds which admit totally geodesic, holomorphic complex homothetic foliation by curves.

Differential Geometry · Mathematics 2016-02-25 Wlodzimierz Jelonek

We prove that the space of surjective holomorphic maps from a compact complex manifold to a compact K\"ahler manifold with trivial canonical class and finite fundamental group is discrete.

Algebraic Geometry · Mathematics 2007-05-23 Jun-Muk Hwang

Locally conformally Kahler (LCK) manifolds with potential are those which admit a Kahler covering with a proper, automorphic Kaehler potential. Existence of a potential can be characterized cohomologically as a vanishing of a certain…

Differential Geometry · Mathematics 2010-04-07 Liviu Ornea , Misha Verbitsky

In this paper, we study global properties of continuous plurisubharmonic functions on complete noncompact K\"ahler manifolds with nonnegative bisectional curvature and their applications to the structure of such manifolds. We prove that…

Differential Geometry · Mathematics 2007-05-23 Lei Ni , Luen-Fai Tam

We prove that every compact complex surface with odd first Betti number admits a locally conformally symplectic $2$-form which tames the underlying almost complex structure.

Differential Geometry · Mathematics 2016-05-10 Vestislav Apostolov , Georges Dloussky
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