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In this paper, we introduce a new geometric description of the manifolds of matrices of fixed rank. The starting point is a geometric description of the Grassmann manifold $\mathbb{G}_r(\mathbb{R}^k)$ of linear subspaces of dimension $r<k$…

Differential Geometry · Mathematics 2022-03-25 Marie Billaud-Friess , Antonio Falco , Anthony Nouy

Frame bundles equipped with a principal connection have their local structure characterised by a 1-form, called the Cartan connection 1-form, which gathers the principal connection form and the soldering form. We introduce generalised frame…

Differential Geometry · Mathematics 2025-09-10 Jérémie Pierard de Maujouy

We investigate relative holomorphic connections on a principal bundle over a family of compact complex manifolds. A sufficient condition is given for the existence of a relative holomorphic connection on a holomorphic principal bundle over…

Algebraic Geometry · Mathematics 2023-05-24 Mainak Poddar , Anoop Singh

We give a complete characterization of invariant integrable complex structures on principal bundles defined over hermitian symmetric spaces, using the Jordan algebraic approach for the curvature computations. In view of possible…

Differential Geometry · Mathematics 2016-01-13 Indranil Biswas , Harald Upmeier

A constructive approach to differential calculus on quantum principal bundles is presented. The calculus on the bundle is built in an intrinsic manner, starting from given graded (differential) *-algebras representing horizontal forms on…

q-alg · Mathematics 2008-02-03 Mico Durdevic

Geometric structures on manifolds became popular when Thurston used them in his work on the geometrization conjecture. They were studied by many people and they play an important role in higher Teichm\"uller theory. Geometric structures on…

Algebraic Geometry · Mathematics 2019-05-14 Daniele Alessandrini

We define the pull-back of a smooth principal fibre bundle, and show that it has a natural principal fibre bundle structure. Next, we analyse the relationship between pull-backs by homotopy equivalent maps. The main result of this article…

Differential Geometry · Mathematics 2007-05-23 Scott Morrison

We show that the statistical manifold of normal distributions is homogeneous. In particular, it admits a $2$-dimensional solvable Lie group structure. In addition, we give a geometric characterization of the Amari-Chentsov…

Differential Geometry · Mathematics 2020-05-29 Hitoshi Furuhata , Jun-ichi Inoguchi , Shimpei Kobayashi

We propose a novel method of finding principal components in multivariate data sets that lie on an embedded nonlinear Riemannian manifold within a higher-dimensional space. Our aim is to extend the geometric interpretation of PCA, while…

Methodology · Statistics 2024-06-05 Zhigang Yao , Benjamin Eltzner , Tung Pham

In this paper, we introduce the notion of a super tangent bundle of a manifold, and extend the basic notions of differential geometry such as differential forms, exterior derivation, connection, metric and divergence on manifolds that…

Differential Geometry · Mathematics 2020-11-17 Naser Boroojerdian

In this note, we introduce the notion of a singular principal G-bundle, associated to a reductive algebraic group G over the complex numbers by means of a faithful representation $\varrho^\p\colon G\lra \SL(V)$. This concept is meant to…

Algebraic Geometry · Mathematics 2007-05-23 Alexander Schmitt

The theory of principal bundles makes sense in any infinity-topos, such as that of topological, of smooth, or of otherwise geometric infinity-groupoids/infinity-stacks, and more generally in slices of these. It provides a natural geometric…

Algebraic Topology · Mathematics 2023-07-03 Thomas Nikolaus , Urs Schreiber , Danny Stevenson

We present a novel generalisation of principal bundles -- principaloid bundles: These are fibre bundles $\pi:P\to B$ where the typical fibre is the arrow manifold $G$ of a Lie groupoid $G\rightrightarrows M$ and the structure group is…

Differential Geometry · Mathematics 2025-03-14 Thomas Strobl , Rafał R. Suszek

The algebraic approach to bundles in non-commutative geometry and the definition of quantum real weighted projective spaces are reviewed. Principal U(1)-bundles over quantum real weighted projective spaces are constructed. As the spaces in…

Quantum Algebra · Mathematics 2012-07-11 Tomasz Brzeziński , Simon A. Fairfax

A geometric framework for describing quantum particles on a possibly curved background is proposed. Natural constructions on certain distributional bundles (`quantum bundles') over the spacetime manifold yield a quantum ``formalism'' along…

Mathematical Physics · Physics 2007-05-23 Daniel Canarutto

The primary objects of study in information geometry are statistical manifolds, which are parametrized families of probability measures, induced with the Fisher-Rao metric and a pair of torsion-free conjugate connections. In recent work,…

Differential Geometry · Mathematics 2023-05-02 Gabriel Khan , Jun Zhang

We compute the cohomology of the right generalised projective Stiefel manifolds and use it to find bounds on the rank of the complementary bundle for certain vector bundles. Further the cohomology computations are also used to find bounds…

Algebraic Topology · Mathematics 2019-08-15 Samik Basu , B. Subhash

Two hierarchies of quantum principal bundles over quantum real projective spaces are constructed. One hierarchy contains bundles with U(1) as a structure group, the other has the quantum group $SU_q(2)$ as a fibre. Both hierarchies are…

Quantum Algebra · Mathematics 2015-05-28 Tomasz Brzeziński , Bartosz Zieliński

In this paper, we construct round fold maps or stable fold maps with concentric singular value sets introduced by the author on smooth bundles over spheres or bundles over more general manifolds. The class of round fold maps includes…

General Topology · Mathematics 2013-05-09 Naoki Kitazawa

A categorical principal bundle is a structure comprised of categories that is analogous to a classical principal bundle; examples arise from geometric contexts involving bundles over path spaces. We show how a categorical principal bundle…

Category Theory · Mathematics 2016-02-15 Saikat Chatterjee , Amitabha Lahiri , Ambar N. Sengupta