Yu-Huei Wu, Chih-Hung Wang
We study Brans-Dicke theory of gravity in Riemann-Cartan space-times, and obtain general torsion solutions, which are completely determined by Brans-Dicke scalar field $\Phi$, in the false vacuum energy dominated epoch. The substitution of the torsion solutions back to our action gives the original Brans-Dicke action with $\Phi$-dependent Brans-Dicke parameter $\omega(\Phi)$. The evolution of $\omega(\Phi)$ during inflation is studied and it yields that $\omega$ approaches to infinity at the end of inflation. It may solve the $\omega$-problem in the extended inflation model.
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http://arxiv.org/abs/1210.1010
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