Generalised scalar-tensor theory and the cosmic acceleration

TL;DR

This paper demonstrates that a specific scalar-tensor theory with a simple functional form of () can explain the current cosmic acceleration without dark energy or a cosmological constant, and allows a smooth transition from deceleration to acceleration.

Contribution

It introduces a simple functional form of () in scalar-tensor theory that accounts for cosmic acceleration and transition phases without additional fields or .

Findings

The model explains current cosmic acceleration.

It provides a smooth transition from deceleration to acceleration.

No need for quintessence or .

Abstract

In this paper it has been shown that a simple functional form of $\omega(\phi)$ in a generalised scalar tensor theory can drive the present cosmic acceleration without any quintessence field or the cosmological constant $\Lambda$. Furthermore, it ensures a smooth transition from a decelerated to an accelerated phase of expansion in the matter dominated regime.