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Geodesically complete affine manifolds are quotients of the Euclidean space through a properly discontinuous action of a subgroup of affine Euclidean transformations. An equivalent definition is that the tangent bundle of such a manifold…

Differential Geometry · Mathematics 2012-10-22 Mihail Cocos

We prove that locally any hyper-K\"ahler metric with torsion admits an HKT potential.

Differential Geometry · Mathematics 2009-11-10 Bertrand Banos , Andrew Swann

We classify all mutation-finite quivers with real weights. We show that every finite mutation class not originating from an integer skew-symmetrizable matrix has a geometric realization by reflections. We also explore the structure of…

Combinatorics · Mathematics 2022-05-04 Anna Felikson , Pavel Tumarkin

In this manuscript we study natural symmetries of Kaehler manifolds: constant holomorphic sectional curvature Kaheler manifolds, semisymmetric Kaehler manifolds and holomorphically pseudosymmetric Kaehler manifolds. We get characterization…

Differential Geometry · Mathematics 2024-02-08 Alma L. Albujer , Jorge Alcázar , Magdalena Caballero

An affine hypersurface is said to admit a pointwise symmetry, if there exists a subgroup of the automorphism group of the tangent space, which preserves (pointwise) the affine metric h, the difference tensor K and the affine shape operator…

Differential Geometry · Mathematics 2007-05-23 Ying Lu , Christine Scharlach

We study function theory and K\"ahler geometry on total spaces of vector bundles on an elliptic curve. For rank two vector bundles of degree zero, we show that any two total spaces are biholomorphic if and only if the corresponding vector…

Differential Geometry · Mathematics 2025-11-13 Hanyu Wu , Bo Yang

We prove that a smooth complex projective threefold with a K\"ahler metric of negative holomorphic sectional curvature has ample canonical line bundle. In dimensions greater than three, we prove that, under equal assumptions, the nef…

Algebraic Geometry · Mathematics 2009-09-02 Gordon Heier , Steven S. Y. Lu , Bun Wong

For Kaehler manifolds we explicitly determine the solution to the conformal Killing form equation in middle degree. In particular, we complete the classification of conformal Killing forms on compact Kaehler manifolds. We give the first…

Differential Geometry · Mathematics 2023-05-15 Paul-Andi Nagy , Uwe Semmelmann

An inventory of all possible homogenous Hilbert curves in two dimensions are reported. Six new Hilbert curves are described by introducing the reversion operation in the construction algorithm. For each curve, the set of affine…

Algebraic Geometry · Mathematics 2014-01-03 C. Pérez-Demydenko , I. Brito-Reyes , B. Aragón Fernández , E. Estevez-Rams

We study Kaehlerian manifolds with Norden metric $g$ and develop the theory of their holomorphic hypersurfaces with constant totally real sectional curvatures. We prove a classification theorem for the holomorphic hypersurfaces of…

Differential Geometry · Mathematics 2012-11-12 Georgi Ganchev , Kostadin Gribachev , Vesselka Mihova

Generalized Kahler geometry is the natural analogue of Kahler geometry, in the context of generalized complex geometry. Just as we may require a complex structure to be compatible with a Riemannian metric in a way which gives rise to a…

Differential Geometry · Mathematics 2010-07-21 Marco Gualtieri

In a vertex algebraic framework, we present an explicit description of the twisted Wakimoto realizations of the affine Lie algebras in correspondence with an arbitrary finite order automorphism and a compatible integral gradation of a…

Quantum Algebra · Mathematics 2015-06-26 L. Feher , B. G. Pusztai

Associated to any affine space A endowed with a metric structure of arbitrary signature we consider the space of affine functionals operating on the space of quadratic functions of A. On this functional space we characterize a symmetric…

Metric Geometry · Mathematics 2023-05-04 Ana Casimiro , Cesar Rodrigo

We give a geometrical description of gravitational theories from the viewpoint of symmetries and affine structure. We show how gravity, considered as a gauge theory, can be consistently achieved by the nonlinear realization of the…

General Relativity and Quantum Cosmology · Physics 2014-11-13 Salvatore Capozziello , Diego Julio Cirilo-Lombardo , Mariafelicia De Laurentis

This note proves the geodesic completeness of any compact manifold endowed with a linear connection such that the closure of its holonomy group is compact.

Differential Geometry · Mathematics 2015-12-22 Luis Aké Hau , Miguel Sánchez

We study algebraic and geometric properties of metric spaces endowed with dilatation structures, which are emergent during the passage through smaller and smaller scales. In the limit we obtain a generalization of metric affine geometry,…

Metric Geometry · Mathematics 2019-02-18 Marius Buliga

We classify complex compact parallelizable manifolds which admit flat torsion free holomorphic affine connections. We exhibit complex compact manifolds admitting holomorphic affine connections, but no flat torsion free holomorphic affine…

Differential Geometry · Mathematics 2009-01-29 Sorin Dumitrescu

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…

Differential Geometry · Mathematics 2007-06-13 Xiuxiong Chen , Claude LeBrun , Brian Weber

It is proved that any (repetitive) Riemannian manifold of bounded geometry can be realized as a leaf of some (minimal) Riemannian matchbox manifold without holonomy. Our methods can be adapted to achieve Cantor transversals or a prescribed…

Geometric Topology · Mathematics 2024-12-17 Jesús A. Álvarez López , Ramón Barral Lijó

Let $P$ be a finite full-dimensional point configuration in $\mathbb{R}^d$. We show that if a point configuration $Q$ has the property that all finite chirotopes realizable by adding (generic) points to $P$ are also realizable by adding…

Combinatorics · Mathematics 2025-05-21 Xavier Goaoc , Arnau Padrol