Testing $\Lambda$-Free f(Q) Cosmology

TL;DR

This paper explores a Lambda-free f(Q) gravity model as an alternative to dark energy for explaining cosmic acceleration, analyzing its viability through dynamical systems and observational data, and finding it less favored than Lambda-CDM.

Contribution

It introduces and tests a Lambda-free f(Q) gravity model using dynamical analysis and observational constraints, providing a novel alternative to dark energy.

Findings

Model is disfavored compared to Lambda-CDM.

Standard siren events could decisively test the model.

Constraints from supernova and CMB data limit the model's parameter space.

Abstract

We study a model of Symmetric Teleparallel gravity that is able to account for the current accelerated expansion of the universe without the need for dark energy component. We investigate this model by making use of dynamical system analysis techniques to identify the regions of the parameter space with viable cosmologies and constrain it using type Ia supernova (SnIa), cosmic microwave background (CMB) data and make forecasts using standard siren (SS) events. We conclude that this model is disfavored with respect to $\Lambda$CDM and forthcoming standard siren events can be decisive in testing the viability of the model.