Late time acceleration in Brans Dicke Cosmology

Abstract

In this work we have investigated the possibility of having a late time accelerated phase of the universe, suggested by recent supernova observation, in the context of Brans Dicke (BD) theory with a symmetry breaking potential and a matter field. We find that a perfect fluid matter field (pressureless and with pressure) cannot support this acceleration but a fluid with dissipative pressure can drive this late time acceleration. We have also calculated some cosmological parameters in our model to match with observations.

8 pages, RevTex style, 3 postscript figures, some more Comments made about the feature of the model, references included, typos corrected. Accepted for publication in Phys.Rev.D