%0 Journal Article
%T Quantum cosmological perfect fluid models
%A F. G. Alvarenga
%A J. C. Fabris
%A N. A. Lemos
%A G. A. Monerat
%J Physics
%D 2001
%I arXiv
%X Perfect fluid Friedmann-Robertson-Walker quantum cosmological models for an arbitrary barotropic equation of state $p = \alpha\rho$ are constructed using Schutz's variational formalism. In this approach the notion of time can be recovered. By superposition of stationary states, finite-norm wave-packet solutions to the Wheeler-DeWitt equation are found. The behaviour of the scale factor is studied by applying the many-worlds and the ontological interpretations of quantum mechanics. Singularity-free models are obtained for $\alpha < 1$. Accelerated expansion at present requires $- 1/3 > \alpha > - 1$.
%U http://arxiv.org/abs/gr-qc/0106051v2