Cosmic Evolution in Generalised Brans-Dicke Theory

TL;DR

This paper explores the Generalised Brans-Dicke theory by deriving exact solutions for cosmic scale factors and scalar fields, analyzing different cosmic epochs, and examining the implications for inflation, deceleration, acceleration, and the variation of G over time.

Contribution

It provides new exact solutions in the Generalised Brans-Dicke framework that describe various cosmic phases and their impact on the gravitational constant G.

Findings

Inflation, deceleration, and acceleration phases can be modeled within this theory.

The variation of G over cosmic time is characterized.

Exact solutions align with observed cosmic evolution patterns.

Abstract

We have studied the Generalised Brans-Dicke theory and obtained exact solutions of a(t),phi(t),and omega(t) for different epochs of the cosmic evolution .We discuss how inflation,decceleration,cosmic acceleration can result from this solution.The time variation of G(t) is also examined.