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A solution of Hilberts fourth problem lead to integral equation of the type generalized cosine transform. The present paper considers the solution that integral equation by integral geometry methods and propose an inversion formula for…

Metric Geometry · Mathematics 2011-03-22 Rafik Aramyan

Some links between Lorentz and Finsler geometries have been developed in the last years, with applications even to the Riemannian case. Our purpose is to give a brief description of them, which may serve as an introduction to recent…

Differential Geometry · Mathematics 2023-10-25 Miguel Ángel Javaloyes , Enrique Pendás-Recondo , Miguel Sánchez

If the flag curvature of a Finsler manifold reduces to sectional curvature, then locally either the Finsler metric is Riemannian, or the flag curvature is isotropic.

Differential Geometry · Mathematics 2018-12-27 Libing Huang , Zhongmin Shen

In this paper, we consider a left invariant complex Finsler metric $F$ on a complex Lie group. Using the technique of invariant frames, we prove the following properties for $(G,F)$. First, the metric $F$ must be a complex Berwald metric.…

Differential Geometry · Mathematics 2025-12-24 Xiyun Xu , Ming Xu

Special coordinate systems are constructed in a neighborhood of a point or of a curve. Taylor expansions can then be easily inferred for the metric, the connection, or the Finsler Lagrangian in terms of curvature invariants. These…

General Relativity and Quantum Cosmology · Physics 2017-02-27 E. Minguzzi

The tree metric theorem provides a combinatorial four point condition that characterizes dissimilarity maps derived from pairwise compatible split systems. A similar (but weaker) four point condition characterizes dissimilarity maps derived…

Combinatorics · Mathematics 2011-10-24 Aaron Kleinman , Matan Harel , Lior Pachter

We extend the Tian approximation theorem for projective manifolds to a class of complex non-K\"ahler manifolds, the so-called Vaisman manifolds. More precisely, we study the problem of approximating compact regular, respectively…

Differential Geometry · Mathematics 2024-08-05 Daniele Angella , Marco Miceli , Giovanni Placini

We establish a regularity result for the metric on any 4-dimensional extremal K\"ahler manifold, and a weak compactness theorem on the space of such metrics. Specifically, the sectional curvature at a point is bounded when the quantity…

Differential Geometry · Mathematics 2011-05-11 Brian Weber

Here, it is introduced a concept of convolution metric in Finslerian Geometry. This convolution metric is a kind of function obtained by a given mathematical operation between two Finslerian metrics. Some basic properties of the Finslerian…

Differential Geometry · Mathematics 2022-03-10 Gilbert Nibaruta

We give a complete list of non-isometric bidimensional rotation invariant K\"ahler-Einstein submanifolds of a finite dimensional complex projective space endowed with the Fubini-Study metric. This solves in the aforementioned case a…

Differential Geometry · Mathematics 2022-06-16 Gianni Manno , Filippo Salis

We obtain some results in both Lorentz and Finsler geometries, by using a correspondence between the conformal structure (Causality) of standard stationary spacetimes on $M=\R\times S$ and Randers metrics on $S$. In particular, for…

Differential Geometry · Mathematics 2012-04-12 Erasmo Caponio , Miguel Angel Javaloyes , Miguel Sanchez

In the previous paper [MR2430243] we computed some geometric quantities such as curvature and flag curvature for a general left invariant Finsler metric on a two-step nilpotent group. In the present paper we give a more complete description…

Differential Geometry · Mathematics 2015-11-18 A. Lengyelné Tóth , Z. Kovács

I classify the Finsler structures on the 2-sphere that have constant Finsler-Gauss curvature and whose geodesics are the great circles. Modulo diffeomorphism, there is a 2-parameter family of such Finsler structures, only one of which is…

dg-ga · Mathematics 2008-02-03 Robert L. Bryant

In this paper, we study Zermelo navigation on Riemannian manifolds and use that to solve a long standing problem in Finsler geometry. Namely, the complete classification of strongly convex Randers metrics of constant flag curvature.

Differential Geometry · Mathematics 2007-05-23 David Bao , Colleen Robles , Zhongmin Shen

In this paper, firstly we study some left invariant Riemannian metrics on para-hypercomplex 4-dimensional Lie groups. In each Lie group, the Levi-Civita connection and sectional curvature have been given explicitly. We also show these…

Differential Geometry · Mathematics 2015-07-09 H. R. Salimi Moghaddam

It is well known that a system of homogeneous second-order ordinary differential equations (spray) is necessarily isotropic in order to be metrizable by a Finsler function of scalar flag curvature. In Theorem 3.1 we show that the isotropy…

Differential Geometry · Mathematics 2014-07-25 Ioan Bucataru , Zoltán Muzsnay

We investigate whether Szabo's metrizability theorem can be extended to Finsler spaces of indefinite signature. For smooth, positive definite Finsler metrics, this important theorem states that, if the metric is of Berwald type (i.e., its…

Differential Geometry · Mathematics 2020-05-05 Andrea Fuster , Sjors Heefer , Christian Pfeifer , Nicoleta Voicu

In this work an intrinsic projectively invariant distance is used to establish a new approach to the study of projective geometry in Finsler space. It is shown that the projectively invariant distance previously defined is a constant…

Differential Geometry · Mathematics 2013-10-03 M. Sepasi , B. Bidabad

Here, using the projectively invariant pseudo-distance and Schwarzian derivative, it is shown that every connected complete Finsler space of the constant negative Ricci scalar is reversible. In particular, every complete Randers metric of…

Differential Geometry · Mathematics 2020-04-22 Behroz Bidabad , Maryam Sepasi

In this paper, we study the set of homogeneous geodesics of a leftinvariant Finsler metric on Lie groups. We first give a simple criterion that characterizes geodesic vectors. As an application, we study some geometric properties of…

Differential Geometry · Mathematics 2007-11-29 Dariush Latifi