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We study the classification of smooth toroidal compactifications of nonuniform ball quotients in the sense of Kodaira and Enriques. Moreover, several results concerning the Riemannian and complex algebraic geometry of these spaces are…

Differential Geometry · Mathematics 2012-01-17 Luca Fabrizio Di Cerbo

We obtain a local classification of complex homothetic foliations on Kaehler manifolds by complex curves. This is used to construct almost Kaehler, Ricci-flat metrics subject to additional curvature properties.

Differential Geometry · Mathematics 2012-06-18 Simon G. Chiossi , Paul-Andi Nagy

We construct a modular compactification via stable slc pairs for the moduli spaces of K3 surfaces with a nonsymplectic group of automorphisms under the assumption that some combination of the fixed loci of automorphisms defines an effective…

Algebraic Geometry · Mathematics 2026-02-24 Valery Alexeev , Philip Engel , Changho Han

We provide a derivative estimate for the pluriclosed flow, controlling higher order derivatives of Chern curvature and torsion using the Chern curvature. Moreover, we derive an estimate for torsion tensor using Chern Ricci curvature in…

Differential Geometry · Mathematics 2023-11-14 Yanan Ye

We classify the surfaces translating under the flows by sub-affine-critical powers of the Gauss curvature. This, in particular, lists all translating solitons possibly model Type II singularities for convex closed solutions in all positive…

Differential Geometry · Mathematics 2024-07-22 Beomjun Choi , Kyeongsu Choi , Soojung Kim

In 1949 Siegel gave an example of a complex two-torus with no nonconstant meromorphic functions. In 1964 Kodaira showed that compact complex surfaces with no nonconstant meromorphic must be of the following three types: tori, Hopf type…

Complex Variables · Mathematics 2018-05-23 Raymond O. Wells

We investigate the linear stability of K\"ahler-Ricci solitons for perturbations induced by varying the complex structure within a fixed K\"ahler class. We calculate stability for the known examples of K\"ahler-Ricci solitons.

Differential Geometry · Mathematics 2016-01-20 Stuart James Hall , Thomas Murphy

We classify surjective self-maps (of degree at least two) of affine surfaces according to the log Kodaira dimension.

Algebraic Geometry · Mathematics 2018-06-20 R. V. Gurjar , De-Qi Zhang

We apply the combinatorial theory of spherical varieties to characterize the momentum polytopes of polarized projective spherical varieties. This enables us to derive a classification of these varieties, without specifying the open orbit,…

Algebraic Geometry · Mathematics 2020-04-16 Stéphanie Cupit-Foutou , Guido Pezzini , Bart Van Steirteghem

The existence of some complex geometrical structures on a compact manifold such as complex structures, Kaehler (pseudo-Kaehler) structures often impose certain restrictions on its underling topological or differentiable manifold. In this…

Complex Variables · Mathematics 2016-01-15 Keizo Hasegawa

We show that any non-collapsed finite time singularity of the Ricci flow on a compact K\"ahler surface is of Type I. Combined with a previous result of the first author, Cifarelli, and Deruelle, it follows that any such singularity is…

Differential Geometry · Mathematics 2025-06-23 Ronan J. Conlon , Max Hallgren , Zilu Ma

It is known that the universal cover of compact Riemann surface is either the projective line, the complex plane or the unit disk. In this article we construct a very explicit family of complex surfaces that gives rise to uncountably many…

Algebraic Geometry · Mathematics 2021-05-04 Gabino González-Diez , Sebastián Reyes-Carocca

In this paper we study the isomonodromic deformations of systems of differential equations with poles of any order on the Riemann sphere as Hamiltonian flows on the product of co-adjoint orbits of the Takiff algebra (i.e. truncated current…

Algebraic Geometry · Mathematics 2022-12-13 Ilia Gaiur , Marta Mazzocco , Vladimir Rubtsov

Given a compact surface $\mathcal{M}$ with a smooth area form $\omega$, we consider an open and dense subset of the set of smooth closed 1-forms on $\mathcal{M}$ with isolated zeros which admit at least one saddle loop homologous to zero…

Dynamical Systems · Mathematics 2018-03-28 Davide Ravotti

Higher KdV flows on spaces of closed equicentroaffine plane curves are studied and it is shown that the flows are described as certain multi-Hamiltonian systems on the spaces. Multi-Hamiltonian systems describing higher mKdV flows are also…

Differential Geometry · Mathematics 2014-04-23 Atsushi Fujioka , Takashi Kurose

We address the existence and properties of multipole solitons localized at a thermally insulating interface between uniform or layered thermal media and a linear dielectric. We find that in the case of uniform media, only surface multipoles…

Optics · Physics 2016-04-13 Yaroslav V. Kartashov , Victor A. Vysloukh , Lluis Torner

We propose a new condition $\aleph$ which enables to get new results on integrable geodesic flows on closed surfaces. This paper has two parts. In the first, we strengthen Kozlov's theorem on non-integrability on surfaces of higher genus.…

Dynamical Systems · Mathematics 2009-06-02 Misha Bialy

Let X be a compact complex surface with a real foliation. If all leaves are compact complex curves, the foliation must be holomorphic.

Complex Variables · Mathematics 2007-05-23 Joerg Winkelmann

We prove that the geodesic flow of a Kupka-Smale riemannian metric on a closed surface has homoclinic orbits for all of its hyperbolic closed geodesics.

Dynamical Systems · Mathematics 2024-07-15 Gonzalo Contreras , Fernando Oliveira

We prove the existence of solutions of the cohomological equation for the geodesic flow on the unit tangent bundle of a compact flat surface with finitely many cone points. We also prove the ergodicity of the holonomy foliation for surfaces…

Dynamical Systems · Mathematics 2025-10-22 Giovanni Forni , Nelson Moll
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