Finsler and Lagrange Geometries in Einstein and String Gravity

TL;DR

This paper reviews Finsler-Lagrange geometry's role in Einstein and string gravity, highlighting how these structures can be modeled on Riemann-Cartan spaces and their applications in modern physics.

Contribution

It introduces a canonical scheme for modeling Finsler-Lagrange structures on Riemannian manifolds and explores their relevance in Einstein and string gravity solutions.

Findings

Finsler-Lagrange structures can be modeled on Riemann-Cartan spaces.

Exact solutions in Einstein and string gravity with Finsler-Lagrange structures are constructed.

Proposes a method to deform Riemannian geometries into Finsler-like configurations.

Abstract

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 understand the crucial importance of such geometric methods for applications in modern physics. We also would like to orient mathematicians working in generalized Finsler and Kahler geometry and geometric mechanics how they could perform their results in order to be accepted by the community of ''orthodox'' physicists. Although the bulk of former models of Finsler-Lagrange spaces where elaborated on tangent bundles, the surprising result advocated in our works is that such locally anisotropic structures can be modelled equivalently on Riemann-Cartan spaces, even as exact solutions in Einstein and/or string gravity, if nonholonomic distributions and moving frames of references are introduced into consideration. We also propose a canonical scheme when geometrical objects on a (pseudo) Riemannian space are nonholonomically deformed into generalized Lagrange, or Finsler, configurations on the same manifold. Such canonical transforms are defined by the coefficients of a prime metric and generate target spaces as Lagrange structures, their models of almost Hermitian/ Kahler, or nonholonomic Riemann spaces. Finally, we consider some classes of exact solutions in string and Einstein gravity modelling Lagrange-Finsler structures with solitonic pp-waves and speculate on their physical meaning.