Constraints on Inflation in Einstein-Brans-Dicke Frame

TL;DR

This paper examines how inflationary models within Einstein-Brans-Dicke gravity are constrained by density perturbation data, finding similarities with constraints from standard Einstein gravity models.

Contribution

It analyzes inflationary potentials in Einstein-Brans-Dicke gravity and compares the resulting constraints with those from Einstein gravity, highlighting their similarities.

Findings

Density perturbation constraints are similar to Einstein gravity models.

Both new and chaotic inflation potentials are considered.

Parameters in inflationary potentials are strongly constrained by data.

Abstract

The density perturbation during inflation seeds the large scale structure. We consider both new inflation-type and chaotic inflation-type potentials in the framework of Einstein-Brans-Dicke gravity. The density perturbation gives strong constraints on the parameters in these potentials. For both potentials, the constraints are not much different from those obtained in the original inflationary models by using of Einstein gravity.