Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: New Action Principle for Classical Particle Trajectories in Spaces with
  Torsion   To comply with recent developments of path integrals in spaces with curvature
and torsion we find the correct variational principle for the classical
trajectories. Although the action depends only on the length, the trajectories
are {\em autoparallels} rather than geodesics due to the effects of a new
torsion force.

24
The categories of this paper are: dg-ga
25
The categories of this paper are: patt-sol
18
The categories of this paper are: econ
10
The categories of this paper are: q-bio
29
The categories of this paper are: funct-an
14
The categories of this paper are: math-ph
8
The categories of this paper are: hep-ex
28
The categories of this paper are: alg-geom
21
The categories of this paper are: adap-org
11
The categories of this paper are: hep-lat
36
The categories of this paper are: cmp-lg
33
The categories of this paper are: plasm-ph
0
The categories of this paper are: hep-ph
16
The categories of this paper are: stat
17
The categories of this paper are: q-fin
27
The categories of this paper are: comp-gas