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We obtain a correspondence between irreducible real parallel spinors on pseudo-Riemannian manifolds $(M,g)$ of signature $(4,3)$ and solutions of an associated differential system for three-forms that satisfy a homogeneous algebraic…

Differential Geometry · Mathematics 2025-03-26 Alejandro Gil-García , C. S. Shahbazi

In this paper, we study strictly convex affine hypersurfaces centroaffinely congruent to their centre map, in the case when the shape operator has two distinct eigenvalues: one of multiplicity 1, and one nonzero of multiplicity n-1. We show…

Differential Geometry · Mathematics 2012-06-04 A. J. Vanderwinden

We prove a structure theorem for closed topological manifolds of cohomogeneity one; this result corrects an oversight in the literature. We complete the equivariant classification of closed, simply connected cohomogeneity one topological…

Geometric Topology · Mathematics 2015-06-09 Fernando Galaz-Garcia , Masoumeh Zarei

We determine all affinely homogeneous models for surfaces $S^2 \subset \mathbb{R}^4$, including the simply transitive models. We employ an improved power series method of equivalence, which captures invariants at the origin, creates…

Differential Geometry · Mathematics 2024-02-29 Julien Heyd , Joel Merker

For a conformal manifold we introduce the notion of an ambient connection, an affine connection on an ambient manifold of the conformal manifold, possibly with torsion, and with conditions relating it to the conformal structure. The purpose…

Differential Geometry · Mathematics 2012-08-14 Stuart Armstrong , Thomas Leistner

We prove constructively the existence of surjective morphisms from affine space onto certain open subvarieties of affine space of the same dimension. For any algebraic set $Z\subset \mathbb{A}^{n-2}\subset \mathbb{A}^{n}$, we construct an…

Algebraic Geometry · Mathematics 2023-08-22 Viktor Balch Barth

The geometric and algebraic properties of smooth projective varieties with 1-regular structure sheaf are well understood, and the complete classification of these varieties is a classical result. The aim of this paper is to study the next…

Algebraic Geometry · Mathematics 2018-03-06 Sijong Kwak , Jinhyung Park

A fuzzy version of the ordinary round 2-sphere has been constructed with an invariant curvature. We here consider linear connections on arbitrary fuzzy surfaces of genus zero. We shall find as before that they are more or less rigidly…

General Relativity and Quantum Cosmology · Physics 2009-10-30 J. Madore

By use of a variety of techniques (most based on constructions of quasipositive knots and links, some old and others new), many smooth 3-manifolds are realized as transverse intersections of complex surfaces in complex 3-space with strictly…

Geometric Topology · Mathematics 2015-08-21 Lee Rudolph

In this paper we provide a \emph{global} investigation of the geometry of parallelizable manifolds (or absolute parallelism geometry) frequently used for application. We discuss the different linear connections and curvature tensors from a…

General Relativity and Quantum Cosmology · Physics 2015-06-11 Nabil L. Youssef , Waleed A. Elsayed

For any link in the $3$-sphere, we give a visual construction of a stable map $f$ from the $3$-sphere into the real plane enjoying the following properties; $f$ has no cusp point, the set of definite fold points of $f$ is isotopic to the…

Geometric Topology · Mathematics 2026-05-25 Gakuto Kato

We give a survey of the theory of affine spheres, emphasizing the convex cases and relationsships to Monge-Ampere equations and geometric structures on manifolds.

Differential Geometry · Mathematics 2008-09-09 John Loftin

Affine manifolds are called integral if there is an atlas such that all transition maps are affine transformations with integer matrices of linear parts. In this paper we describe all complete integral affine structures on compact…

Differential Geometry · Mathematics 2018-12-27 Ivan Kozlov

We study the affine quasi-Einstein equation, a second order linear homogeneous equation, which is invariantly defined on any affine manifold. We prove that the space of solutions is finite-dimensional, and its dimension is a strongly…

Differential Geometry · Mathematics 2017-05-24 Miguel Brozos Vázquez , Eduardo García Río , Peter Gilkey , Xabier Valle Regueiro

In this paper, we show that a compact affine manifold endowed with an Affine Anosov transformation is finitely covered by a complete affine nilmanifold.

Differential Geometry · Mathematics 2007-05-23 A. Tsemo

We prove that homological mirror symmetry for very affine hypersurfaces respects certain natural symplectic operations (as functors between partially wrapped Fukaya categories), verifying conjectures of Auroux. These conjectures concern…

Symplectic Geometry · Mathematics 2025-01-03 Benjamin Gammage , Maxim Jeffs

We characterize compact locally conformal parallel $G_2$ (respectively, $Spin(7)$) manifolds as fiber bundles over $S^1$ with compact nearly K\"ahler (respectively, compact nearly parallel $G_2$) fiber. A more specific characterization is…

Differential Geometry · Mathematics 2007-05-23 Stefan Ivanov , Maurizio Parton , Paolo Piccinni

We prove sharp $L^2$ Fourier restriction inequalities for compact, smooth surfaces in $\mathbb{R}^3$ equipped with the affine surface measure or a power thereof. The results are valid for all smooth surfaces and the bounds are uniform for…

Classical Analysis and ODEs · Mathematics 2024-11-08 Jianhui Li

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

The classical concept of affine locally symmetric spaces allows a generalization for various geometric structures on a smooth manifold. We remind the notion of symmetry for parabolic geometries and we summarize the known facts for…

Differential Geometry · Mathematics 2009-05-25 Lenka Zalabova , Vojtech Zadnik