## Advanced Studies in Pure Mathematics

### Finsler geometry in the tangent bundle

Lajos Tamássy

#### Abstract

Linear and metrical connections of a Riemannian space, whose indicatrices are ellipsoids, are established in the tangent bundle. Indicatrices of Finsler spaces are smooth, starshaped and convex hypersurfaces. They do not transform, in general, into each other by linear transformations, and thus they do not admit linear metrical connections in the tangent bundle. This necessitates the introduction of line-elements yielding the dependence of the geometric objects not only of points $x$ but also of the direction $y$. Therefore, the apparatus (connections, covariant derivatives, curvatures, etc.) of Finsler geometry becomes inevitably a little more complicated.

Nevertheless there are a number of problems which need no line-elements. Such are those, which concern the metric only (arc length, area, angle, geodesics, etc.) and also the investigation of those important special Finsler spaces, which allow linear metrical connections in the tangent bundle.

In this paper we want to present results which use the tangent bundle $TM$ only, and do not need $TTM$ or $VTM$ or line-elements. These investigations often admit direct geometrical considerations. Longer proofs are only sketched or omitted.

#### Article information

Dates
Revised: 17 July 2006
First available in Project Euclid: 16 December 2018

https://projecteuclid.org/ euclid.aspm/1545001106

Digital Object Identifier
doi:10.2969/aspm/04810163

Mathematical Reviews number (MathSciNet)
MR2389255

Zentralblatt MATH identifier
1144.53094

#### Citation

Tamássy, Lajos. Finsler geometry in the tangent bundle. Finsler Geometry, Sapporo 2005 — In Memory of Makoto Matsumoto, 163--194, Mathematical Society of Japan, Tokyo, Japan, 2007. doi:10.2969/aspm/04810163. https://projecteuclid.org/euclid.aspm/1545001106