Dissipative Fluid in Brans Dicke theory and late time acceleration

TL;DR

This paper explores late-time cosmic acceleration using a dissipative fluid within Brans-Dicke theory, fitting model parameters to supernova and radio source data without requiring a scalar field potential.

Contribution

It introduces a novel approach combining dissipative fluids with Brans-Dicke theory to explain cosmic acceleration without scalar potential.

Findings

Model fits supernova data well

Consistent with radio source observations

Supports dissipative fluids as a mechanism for acceleration

Abstract

We have investigated the possibility of having a late time accelerated expansion phase for the universe. We have used a dissipative fluid in Brans-Dicke(BD) theory for this purpose. The model does not involve any potential for the BD scalar field. We have obtained the best fit values for the different parameters in our model by comparing our model predictions with SNIa data and the also with the data from the ultra-compact radio sources.