Cosmology in GSG

TL;DR

This paper explores cosmological models within the geometric scalar gravity framework, highlighting the potential for bouncing universes without exotic matter and analyzing perturbations and structure formation mechanisms.

Contribution

It introduces a novel cosmological approach in GSG with two solution classes and discusses bounce scenarios and perturbation theory.

Findings

Existence of bouncing solutions without exotic matter

Framework for cosmological perturbations in GSG

Insights into structure formation via gravitational instability

Abstract

We describe what cosmology looks like in the context of the geometric theory of gravity (GSG) based on a single scalar field. There are two distinct classes of cosmological solutions. An interesting feature is the possibility of having a bounce without invoking exotic equations of state for the cosmic fluid. We also discuss cosmological perturbation and present the basis of structure formation by gravitational instability in the framework of the geometric scalar gravity.