Quantum Back-Reaction in Scale Invariant Induced Gravity Inflation

TL;DR

This paper investigates how quantum fluctuations influence the inflationary dynamics in a scale-invariant induced gravity model with a quartic potential, aiming to connect theoretical predictions with observational data.

Contribution

It introduces a study of quantum back-reaction effects on de Sitter attractors in induced gravity inflation, providing a novel analysis of perturbation impacts on inflationary parameters.

Findings

Quantum back-reaction modifies the homogeneous inflationary dynamics.

Results constrain model parameters based on inflationary observables.

Comparison with data narrows viable parameter space.

Abstract

A quartic, self-interacting potential in the induced gravity framework is known to have a pure de Sitter attractor for the homogeneous mode. In order to obtain non-zero slow roll parameters we therefore study the quantum back-reaction of the scalar and the tensor perturbations on such a homogeneous dynamics. The results are then compared with inflationary observables in order to constrain the parameters of the model.