Inflation with explicit parametric connection between General Relativity and Scalar-Tensor gravity

TL;DR

This paper explores cosmological inflation in scalar-tensor gravity, comparing it with standard general relativity inflation, by introducing a parameter that links gravity functions with the universe's scale factor.

Contribution

It introduces a parametric connection between scalar-tensor gravity and general relativity in the context of inflation, using a special ansatz relating gravity functions to the universe's scale factor.

Findings

The parameter Δ determines differences between scalar-tensor and GR inflation.

The ansatz links gravity functions directly to the scale factor.

Comparison shows how inflation dynamics vary with Δ.

Abstract

In this paper we consider the cosmological inflation within scalar-tensor gravity and compare it with standard inflation based on general relativity. The difference is determined by the value of the parameter $\Delta$. This approach is associated with using the special ansatz which links a function that defines a type of gravity with a scale factor of the universe.