Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Gravitational Stability of inflaton and torsion in
  Einstein-Cartan-Klein-Gordon cosmology with kinky potentials   Gravitational stability of torsion and inflaton field in a four-dimensional
spacetime de Sitter solution in scalar-tensor cosmology where Cartan torsion
propagates is investigated in detail. Inflaton and torsion evolution equations
are derived by making use of a Lagrangean method. Stable and unstable modes for
torsion and inflatons are found to be dependent of the background torsion and
inflaton fields. Present astrophysical observations favour a stable mode for
torsion since this would explain why no relic torsion imprint has been found on
the Cosmic Background Radiation in the universe.

8
The categories of this paper are: hep-ex
11
The categories of this paper are: hep-lat
31
The categories of this paper are: ao-sci
9
The categories of this paper are: nlin
24
The categories of this paper are: dg-ga
16
The categories of this paper are: stat
35
The categories of this paper are: mtrl-th
6
The categories of this paper are: astro-ph
2
The categories of this paper are: math
17
The categories of this paper are: q-fin
0
The categories of this paper are: hep-ph
18
The categories of this paper are: econ
30
The categories of this paper are: q-alg
25
The categories of this paper are: patt-sol
28
The categories of this paper are: alg-geom
3
The categories of this paper are: physics