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We discuss in which sense general metric measure spaces possess a first order differential structure. Building on this, we then see that on spaces with Ricci curvature bounded from below a second order calculus can be developed, permitting…

Differential Geometry · Mathematics 2014-07-04 Nicola Gigli

Let $N$ be a Riemannian, neutral or Lorentzian $4$-dimensional space form. In this paper, the expressions of the equations of Gauss, Codazzi and Ricci of a space-like or time-like surface in $N$ given in [7] are naturally understood in…

Differential Geometry · Mathematics 2026-03-31 Naoya Ando

Recently, we have studied the Finsler space with h-Matsumoto change and found Cartan connection for the transformed space [2]. In this paper, we have discussed certain geometrical properties of the hypersurface of a Finsler space for the…

Differential Geometry · Mathematics 2022-05-10 M. K. Gupta , Suman Sharma

A new construction is presented for point interactions (PI) and generalised point interactions (GPI). The construction is an inverse scattering procedure, using integral transforms suggested by the required scattering theory. The usual…

High Energy Physics - Theory · Physics 2007-05-23 C. J. Fewster

A new geometrical definition of naturally reductive Finsler manifold using geodeic graph is proposed, with a possible generalization. Based on a construction from a recent paper by the authors, Finsler metrics based on naturally reductive…

Differential Geometry · Mathematics 2025-10-28 Teresa Arias-Marco , Zdenek Dusek

In this study, some new types of timelike general helices associated to a non-lightlike curve are introduced in Minkowski 3-space. These new helices are called associated timelike helices. Some special types of associated timelike helices…

General Mathematics · Mathematics 2022-02-04 Mehmet Önder

We study singularities of geodesics flows in two-dimensional generalized Finsler spaces (pseudo-Finsler spaces). Geodesics are defined as extremals of a certain auxiliary functional whose non-isotropic extremals coincide with extremals of…

Differential Geometry · Mathematics 2016-11-22 A. O. Remizov

We establish some important inequalities under a lower weighted Ricci curvature bound on Finsler manifolds. Firstly, we establish a relative volume comparison of Bishop-Gromov type. As one of the applications, we obtain an upper bound for…

Differential Geometry · Mathematics 2021-07-16 Xinyue Cheng , Zhongmin Shen

The novel concept of box spline of complex degree is introduced and several of its properties derived and discussed. These box splines of complex degree generalize and extend the classical box splines. Relations to a class of fractional…

Functional Analysis · Mathematics 2023-09-06 Fabio Marcelo Carvalho dos Santos , Peter Massopust

An attempt is made of giving a self-contained introduction to holomorphic ideas in general relativity, following work over the last thirty years by several authors. The main topics are complex manifolds, spinor and twistor methods, heaven…

General Relativity and Quantum Cosmology · Physics 2007-05-23 Giampiero Esposito

We generalize the geometry of Santilli's locally anisotropic and inhomogeneous isospaces to the geometry of vector isobundles provided with nonlinear and distinguished isoconnections and isometric structures. We present, apparently for the…

General Physics · Physics 2008-02-03 Sergiu I. Vacaru

We consider circle patterns on surfaces with complex projective structures. We investigate two symplectic forms pulled back to the deformation space of circle patterns. The first one is Goldman's symplectic form on the space of complex…

Geometric Topology · Mathematics 2024-04-29 Wai Yeung Lam

In this article, we review the current status of Finsler-Lagrange geometry and generalizations. The goal is to aid non-experts on Finsler spaces, but physicists and geometers skilled in general relativity and particle theories, to…

General Relativity and Quantum Cosmology · Physics 2008-01-31 Sergiu I. Vacaru

Radu Miron's approach to modelling of generalized Lagrange, Finsler and Kaluza-Klein spaces on vector (super) bundles provided with compatible nonlinear and distinguished connections and metric structures is discussed in connection with the…

Mathematical Physics · Physics 2008-11-06 Sergiu I. Vacaru

The theory of spinors is developed for locally anisotropic (la) spaces, in brief la-spaces, which in general are modeled as vector bundles provided with nonlinear and distinguished connections and metric structures (such la-spaces contain…

General Relativity and Quantum Cosmology · Physics 2009-10-28 Sergiu I. Vacaru

A detailed study of the notions of convexity for a hypersurface in a Finsler manifold is carried out. In particular, the infinitesimal and local notions of convexity are shown to be equivalent. Our approach differs from Bishop's one in his…

Differential Geometry · Mathematics 2011-01-24 Rossella Bartolo , Erasmo Caponio , Anna Valeria Germinario , Miguel Sanchez

Based on the analogue spacetime programme, and many other ideas currently mooted in "quantum gravity", there is considerable ongoing speculation that the usual pseudo-Riemannian (Lorentzian) manifolds of general relativity might eventually…

General Relativity and Quantum Cosmology · Physics 2009-11-05 Jozef Skakala , Matt Visser

In this paper, we construct tools from the holomorphic twistor spaces that we introduced in \cite{Gindi1} to derive results about the complex geometries of their base manifolds. In particular, we develop a new approach to studying…

Differential Geometry · Mathematics 2018-11-22 Steven Gindi

We explore connections between geometrical properties of null congruences and the algebraic structure of the Weyl tensor in n>4 spacetime dimensions. First, we present the full set of Ricci identities on a suitable "null" frame, thus…

General Relativity and Quantum Cosmology · Physics 2012-02-22 Marcello Ortaggio , Vojtech Pravda , Alena Pravdova

Pinor and spinor fields are sections of the subbundles whose fibers are the representation spaces of the Clifford algebra of the forms, equipped with the Graf product. In this context, pinors and spinors are here considered and the…

Mathematical Physics · Physics 2018-08-21 R. Lopes , R. da Rocha