Speaker
Description
In this presentation, we explore the rich cosmological dynamics of a symmetric teleparallel theory, the so-called Newer General Relativity (Newer GR) for a flat FLRW metric. We begin by introducing the fundamental concepts of non-metricity-based theories and Newer GR cosmology. We focus on two physically motivated one-parameter subclasses of theories for which the post-Newtonian parameters are the same as in GR and no ghost modes emerge. We consider two models in particular: one that involves a single fluid and one with dust and radiation. For each theory and model, we determine the (angular) fixed points, bounces and turnarounds, the existence of effective dark energy, potential singularities and we make conclusions about the possible cosmological scenarios.