Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Toward a Gravitation Theory in Berwald--Finsler Space   Finsler geometry is a natural and fundamental generalization of Riemann
geometry. The Finsler structure depends on both coordinates and velocities. It
is defined as a function on tangent bundle of a manifold. We use the Bianchi
identities satisfied by Chern curvature to set up a gravitation theory in
Berwald-Finsler space. The geometric part of the gravitational field equation
is nonsymmetric in general. This indicates that the local Lorentz invariance is
violated. Nontrivial solutions of the gravitational field equation are
presented.

23
The categories of this paper are: solv-int
1
The categories of this paper are: cs
33
The categories of this paper are: plasm-ph
22
The categories of this paper are: chao-dyn
8
The categories of this paper are: hep-ex
35
The categories of this paper are: mtrl-th
17
The categories of this paper are: q-fin
19
The categories of this paper are: eess
11
The categories of this paper are: hep-lat
9
The categories of this paper are: nlin
14
The categories of this paper are: math-ph
34
The categories of this paper are: chem-ph
4
The categories of this paper are: cond-mat
10
The categories of this paper are: q-bio
20
The categories of this paper are: acc-phys
27
The categories of this paper are: comp-gas