Late time acceleration in Brans Dicke Cosmology

TL;DR

This paper explores how Brans-Dicke cosmology with a symmetry breaking potential can produce late-time acceleration of the universe, emphasizing the role of dissipative pressure in driving this acceleration.

Contribution

It demonstrates that dissipative pressure in matter fields within Brans-Dicke theory can lead to late-time cosmic acceleration, unlike perfect fluids.

Findings

Dissipative pressure enables late-time acceleration in Brans-Dicke cosmology.

Perfect fluid matter cannot support acceleration in this model.

Cosmological parameters calculated align with observations.

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.