Late-time dynamics of dark energy EoS in symmetric teleparallel gravity

TL;DR

This paper investigates the late-time behavior of dark energy's equation of state within symmetric teleparallel gravity, demonstrating models that fit observational data and can predict various cosmic evolution scenarios.

Contribution

It introduces non-linear dark energy EoS models in symmetric teleparallel gravity and constrains them using observational data, showing their ability to describe universe evolution.

Findings

Models fit supernovae and expansion rate data effectively.

The models can predict quintom or future deceleration scenarios.

Cosmological indicators support the viability of these models.

Abstract

In the symmetric teleparallel gravity framework, we study the cosmic dynamics of the universe with dark energy equation of state (EoS) parameter having non-linear forms. The non-metricity scalar induced by the dark energy EoS parameter evolves with time and, explains the physically reasonable transiting universe evolution in a consistent way. A comparative study has been presented to describe the ability of these models to fit the observational data. By using the Bayesian methods, we constrain the model parameters with the supernovae Ia (SneIa) and expansion rate data. We show that the expansion rate solutions may consistently describe the universe evolution based on cosmological indicators such as the effective EoS parameter, energy density, pressure, current age and the statefinder diagnostic. One may either have the quintom scenario or the future deceleration in these models subjected to the observational constraints.