Abstract
We study the Brans-Dicke theory of gravity in Riemann-Cartan space-times and obtain general torsion solutions, which are completely determined by the Brans-Dicke scalar field , in the false- vacuum-energy–dominated epoch. The substitution of the torsion solutions back to our action gives the original Brans-Dicke action with -dependent Brans-Dicke parameter . The evolution of during the inflation is studied and it is found that approaches infinity at the end of inflation. This may solve the -problem in the extended inflation model.
- Received 8 October 2012
DOI:https://doi.org/10.1103/PhysRevD.86.123519
© 2012 American Physical Society