An ostentatious model of cosmological scalar-tensor theory

TL;DR

This paper introduces a new scalar-tensor gravity model with higher order derivatives that replicates standard cosmological solutions, offering potential modifications for cosmological scenarios.

Contribution

It presents a novel scalar-tensor gravity model with higher order derivatives that maintains standard cosmological solutions, expanding the theoretical landscape.

Findings

The model reproduces Einstein gravity solutions in a cosmological setting.

Higher order derivative terms do not alter homogeneous and isotropic universe solutions.

A brief discussion on possible modifications of the model is included.

Abstract

We consider a novel model of gravity with a scalar field described by the Lagrangian with higher order derivative terms in a cosmological context. The model has the same solution for the homogeneous and isotropic universe as in the model with the Einstein gravity, notwithstanding the additional higher order terms. A possible modification scenario is briefly discussed lastly.