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. 
L.C. Garcia de Andrade (Departamento de Fisica Teorica-IF-UERJ)